Coverage for pyspark/ml/feature.py : 90%
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# # Licensed to the Apache Software Foundation (ASF) under one or more # contributor license agreements. See the NOTICE file distributed with # this work for additional information regarding copyright ownership. # The ASF licenses this file to You under the Apache License, Version 2.0 # (the "License"); you may not use this file except in compliance with # the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. #
HasInputCols, HasOutputCols, HasHandleInvalid, HasRelativeError, HasFeaturesCol, HasLabelCol, \ HasSeed, HasNumFeatures, HasStepSize, HasMaxIter, TypeConverters, Param, Params
'BucketedRandomProjectionLSH', 'BucketedRandomProjectionLSHModel', 'Bucketizer', 'ChiSqSelector', 'ChiSqSelectorModel', 'CountVectorizer', 'CountVectorizerModel', 'DCT', 'ElementwiseProduct', 'FeatureHasher', 'HashingTF', 'IDF', 'IDFModel', 'Imputer', 'ImputerModel', 'IndexToString', 'Interaction', 'MaxAbsScaler', 'MaxAbsScalerModel', 'MinHashLSH', 'MinHashLSHModel', 'MinMaxScaler', 'MinMaxScalerModel', 'NGram', 'Normalizer', 'OneHotEncoder', 'OneHotEncoderModel', 'PCA', 'PCAModel', 'PolynomialExpansion', 'QuantileDiscretizer', 'RobustScaler', 'RobustScalerModel', 'RegexTokenizer', 'RFormula', 'RFormulaModel', 'SQLTransformer', 'StandardScaler', 'StandardScalerModel', 'StopWordsRemover', 'StringIndexer', 'StringIndexerModel', 'Tokenizer', 'UnivariateFeatureSelector', 'UnivariateFeatureSelectorModel', 'VarianceThresholdSelector', 'VarianceThresholdSelectorModel', 'VectorAssembler', 'VectorIndexer', 'VectorIndexerModel', 'VectorSizeHint', 'VectorSlicer', 'Word2Vec', 'Word2VecModel']
HasInputCols, HasOutputCols, JavaMLReadable, JavaMLWritable): """ Binarize a column of continuous features given a threshold. Since 3.0.0, :py:class:`Binarize` can map multiple columns at once by setting the :py:attr:`inputCols` parameter. Note that when both the :py:attr:`inputCol` and :py:attr:`inputCols` parameters are set, an Exception will be thrown. The :py:attr:`threshold` parameter is used for single column usage, and :py:attr:`thresholds` is for multiple columns.
.. versionadded:: 1.4.0
Examples -------- >>> df = spark.createDataFrame([(0.5,)], ["values"]) >>> binarizer = Binarizer(threshold=1.0, inputCol="values", outputCol="features") >>> binarizer.setThreshold(1.0) Binarizer... >>> binarizer.setInputCol("values") Binarizer... >>> binarizer.setOutputCol("features") Binarizer... >>> binarizer.transform(df).head().features 0.0 >>> binarizer.setParams(outputCol="freqs").transform(df).head().freqs 0.0 >>> params = {binarizer.threshold: -0.5, binarizer.outputCol: "vector"} >>> binarizer.transform(df, params).head().vector 1.0 >>> binarizerPath = temp_path + "/binarizer" >>> binarizer.save(binarizerPath) >>> loadedBinarizer = Binarizer.load(binarizerPath) >>> loadedBinarizer.getThreshold() == binarizer.getThreshold() True >>> loadedBinarizer.transform(df).take(1) == binarizer.transform(df).take(1) True >>> df2 = spark.createDataFrame([(0.5, 0.3)], ["values1", "values2"]) >>> binarizer2 = Binarizer(thresholds=[0.0, 1.0]) >>> binarizer2.setInputCols(["values1", "values2"]).setOutputCols(["output1", "output2"]) Binarizer... >>> binarizer2.transform(df2).show() +-------+-------+-------+-------+ |values1|values2|output1|output2| +-------+-------+-------+-------+ | 0.5| 0.3| 1.0| 0.0| +-------+-------+-------+-------+ ... """
"Param for threshold used to binarize continuous features. " + "The features greater than the threshold will be binarized to 1.0. " + "The features equal to or less than the threshold will be binarized to 0.0", typeConverter=TypeConverters.toFloat) "Param for array of threshold used to binarize continuous features. " + "This is for multiple columns input. If transforming multiple columns " + "and thresholds is not set, but threshold is set, then threshold will " + "be applied across all columns.", typeConverter=TypeConverters.toListFloat)
inputCols=None, outputCols=None): """ __init__(self, \\*, threshold=0.0, inputCol=None, outputCol=None, thresholds=None, \ inputCols=None, outputCols=None) """
inputCols=None, outputCols=None): """ setParams(self, \\*, threshold=0.0, inputCol=None, outputCol=None, thresholds=None, \ inputCols=None, outputCols=None) Sets params for this Binarizer. """
def setThreshold(self, value): """ Sets the value of :py:attr:`threshold`. """
def setThresholds(self, value): """ Sets the value of :py:attr:`thresholds`. """ return self._set(thresholds=value)
""" Sets the value of :py:attr:`inputCol`. """
def setInputCols(self, value): """ Sets the value of :py:attr:`inputCols`. """
""" Sets the value of :py:attr:`outputCol`. """
def setOutputCols(self, value): """ Sets the value of :py:attr:`outputCols`. """
""" Mixin for Locality Sensitive Hashing (LSH) algorithm parameters. """
"increasing number of hash tables lowers the false negative rate, " + "and decreasing it improves the running performance.", typeConverter=TypeConverters.toInt)
""" Gets the value of numHashTables or its default value. """ return self.getOrDefault(self.numHashTables)
""" Mixin for Locality Sensitive Hashing (LSH). """
""" Sets the value of :py:attr:`numHashTables`. """ return self._set(numHashTables=value)
""" Sets the value of :py:attr:`inputCol`. """
""" Sets the value of :py:attr:`outputCol`. """
""" Mixin for Locality Sensitive Hashing (LSH) models. """
""" Sets the value of :py:attr:`inputCol`. """
""" Sets the value of :py:attr:`outputCol`. """
""" Given a large dataset and an item, approximately find at most k items which have the closest distance to the item. If the :py:attr:`outputCol` is missing, the method will transform the data; if the :py:attr:`outputCol` exists, it will use that. This allows caching of the transformed data when necessary.
Notes ----- This method is experimental and will likely change behavior in the next release.
Parameters ---------- dataset : :py:class:`pyspark.sql.DataFrame` The dataset to search for nearest neighbors of the key. key : :py:class:`pyspark.ml.linalg.Vector` Feature vector representing the item to search for. numNearestNeighbors : int The maximum number of nearest neighbors. distCol : str Output column for storing the distance between each result row and the key. Use "distCol" as default value if it's not specified.
Returns ------- :py:class:`pyspark.sql.DataFrame` A dataset containing at most k items closest to the key. A column "distCol" is added to show the distance between each row and the key. """ distCol)
""" Join two datasets to approximately find all pairs of rows whose distance are smaller than the threshold. If the :py:attr:`outputCol` is missing, the method will transform the data; if the :py:attr:`outputCol` exists, it will use that. This allows caching of the transformed data when necessary.
Parameters ---------- datasetA : :py:class:`pyspark.sql.DataFrame` One of the datasets to join. datasetB : :py:class:`pyspark.sql.DataFrame` Another dataset to join. threshold : float The threshold for the distance of row pairs. distCol : str, optional Output column for storing the distance between each pair of rows. Use "distCol" as default value if it's not specified.
Returns ------- :py:class:`pyspark.sql.DataFrame` A joined dataset containing pairs of rows. The original rows are in columns "datasetA" and "datasetB", and a column "distCol" is added to show the distance between each pair. """
""" Params for :py:class:`BucketedRandomProjectionLSH` and :py:class:`BucketedRandomProjectionLSHModel`.
.. versionadded:: 3.0.0 """
"a larger bucket lowers the false negative rate.", typeConverter=TypeConverters.toFloat)
def getBucketLength(self): """ Gets the value of bucketLength or its default value. """
HasSeed, JavaMLReadable, JavaMLWritable): """ LSH class for Euclidean distance metrics. The input is dense or sparse vectors, each of which represents a point in the Euclidean distance space. The output will be vectors of configurable dimension. Hash values in the same dimension are calculated by the same hash function.
.. versionadded:: 2.2.0
Notes -----
- `Stable Distributions in Wikipedia article on Locality-sensitive hashing \ <https://en.wikipedia.org/wiki/Locality-sensitive_hashing#Stable_distributions>`_ - `Hashing for Similarity Search: A Survey <https://arxiv.org/abs/1408.2927>`_
Examples -------- >>> from pyspark.ml.linalg import Vectors >>> from pyspark.sql.functions import col >>> data = [(0, Vectors.dense([-1.0, -1.0 ]),), ... (1, Vectors.dense([-1.0, 1.0 ]),), ... (2, Vectors.dense([1.0, -1.0 ]),), ... (3, Vectors.dense([1.0, 1.0]),)] >>> df = spark.createDataFrame(data, ["id", "features"]) >>> brp = BucketedRandomProjectionLSH() >>> brp.setInputCol("features") BucketedRandomProjectionLSH... >>> brp.setOutputCol("hashes") BucketedRandomProjectionLSH... >>> brp.setSeed(12345) BucketedRandomProjectionLSH... >>> brp.setBucketLength(1.0) BucketedRandomProjectionLSH... >>> model = brp.fit(df) >>> model.getBucketLength() 1.0 >>> model.setOutputCol("hashes") BucketedRandomProjectionLSHModel... >>> model.transform(df).head() Row(id=0, features=DenseVector([-1.0, -1.0]), hashes=[DenseVector([-1.0])]) >>> data2 = [(4, Vectors.dense([2.0, 2.0 ]),), ... (5, Vectors.dense([2.0, 3.0 ]),), ... (6, Vectors.dense([3.0, 2.0 ]),), ... (7, Vectors.dense([3.0, 3.0]),)] >>> df2 = spark.createDataFrame(data2, ["id", "features"]) >>> model.approxNearestNeighbors(df2, Vectors.dense([1.0, 2.0]), 1).collect() [Row(id=4, features=DenseVector([2.0, 2.0]), hashes=[DenseVector([1.0])], distCol=1.0)] >>> model.approxSimilarityJoin(df, df2, 3.0, distCol="EuclideanDistance").select( ... col("datasetA.id").alias("idA"), ... col("datasetB.id").alias("idB"), ... col("EuclideanDistance")).show() +---+---+-----------------+ |idA|idB|EuclideanDistance| +---+---+-----------------+ | 3| 6| 2.23606797749979| +---+---+-----------------+ ... >>> model.approxSimilarityJoin(df, df2, 3, distCol="EuclideanDistance").select( ... col("datasetA.id").alias("idA"), ... col("datasetB.id").alias("idB"), ... col("EuclideanDistance")).show() +---+---+-----------------+ |idA|idB|EuclideanDistance| +---+---+-----------------+ | 3| 6| 2.23606797749979| +---+---+-----------------+ ... >>> brpPath = temp_path + "/brp" >>> brp.save(brpPath) >>> brp2 = BucketedRandomProjectionLSH.load(brpPath) >>> brp2.getBucketLength() == brp.getBucketLength() True >>> modelPath = temp_path + "/brp-model" >>> model.save(modelPath) >>> model2 = BucketedRandomProjectionLSHModel.load(modelPath) >>> model.transform(df).head().hashes == model2.transform(df).head().hashes True """
bucketLength=None): """ __init__(self, \\*, inputCol=None, outputCol=None, seed=None, numHashTables=1, \ bucketLength=None) """ self._new_java_obj("org.apache.spark.ml.feature.BucketedRandomProjectionLSH", self.uid)
bucketLength=None): """ setParams(self, \\*, inputCol=None, outputCol=None, seed=None, numHashTables=1, \ bucketLength=None) Sets params for this BucketedRandomProjectionLSH. """
def setBucketLength(self, value): """ Sets the value of :py:attr:`bucketLength`. """
""" Sets the value of :py:attr:`seed`. """
JavaMLReadable, JavaMLWritable): r""" Model fitted by :py:class:`BucketedRandomProjectionLSH`, where multiple random vectors are stored. The vectors are normalized to be unit vectors and each vector is used in a hash function: :math:`h_i(x) = floor(r_i \cdot x / bucketLength)` where :math:`r_i` is the i-th random unit vector. The number of buckets will be `(max L2 norm of input vectors) / bucketLength`.
.. versionadded:: 2.2.0 """
HasHandleInvalid, JavaMLReadable, JavaMLWritable): """ Maps a column of continuous features to a column of feature buckets. Since 3.0.0, :py:class:`Bucketizer` can map multiple columns at once by setting the :py:attr:`inputCols` parameter. Note that when both the :py:attr:`inputCol` and :py:attr:`inputCols` parameters are set, an Exception will be thrown. The :py:attr:`splits` parameter is only used for single column usage, and :py:attr:`splitsArray` is for multiple columns.
.. versionadded:: 1.4.0
Examples -------- >>> values = [(0.1, 0.0), (0.4, 1.0), (1.2, 1.3), (1.5, float("nan")), ... (float("nan"), 1.0), (float("nan"), 0.0)] >>> df = spark.createDataFrame(values, ["values1", "values2"]) >>> bucketizer = Bucketizer() >>> bucketizer.setSplits([-float("inf"), 0.5, 1.4, float("inf")]) Bucketizer... >>> bucketizer.setInputCol("values1") Bucketizer... >>> bucketizer.setOutputCol("buckets") Bucketizer... >>> bucketed = bucketizer.setHandleInvalid("keep").transform(df).collect() >>> bucketed = bucketizer.setHandleInvalid("keep").transform(df.select("values1")) >>> bucketed.show(truncate=False) +-------+-------+ |values1|buckets| +-------+-------+ |0.1 |0.0 | |0.4 |0.0 | |1.2 |1.0 | |1.5 |2.0 | |NaN |3.0 | |NaN |3.0 | +-------+-------+ ... >>> bucketizer.setParams(outputCol="b").transform(df).head().b 0.0 >>> bucketizerPath = temp_path + "/bucketizer" >>> bucketizer.save(bucketizerPath) >>> loadedBucketizer = Bucketizer.load(bucketizerPath) >>> loadedBucketizer.getSplits() == bucketizer.getSplits() True >>> loadedBucketizer.transform(df).take(1) == bucketizer.transform(df).take(1) True >>> bucketed = bucketizer.setHandleInvalid("skip").transform(df).collect() >>> len(bucketed) 4 >>> bucketizer2 = Bucketizer(splitsArray= ... [[-float("inf"), 0.5, 1.4, float("inf")], [-float("inf"), 0.5, float("inf")]], ... inputCols=["values1", "values2"], outputCols=["buckets1", "buckets2"]) >>> bucketed2 = bucketizer2.setHandleInvalid("keep").transform(df) >>> bucketed2.show(truncate=False) +-------+-------+--------+--------+ |values1|values2|buckets1|buckets2| +-------+-------+--------+--------+ |0.1 |0.0 |0.0 |0.0 | |0.4 |1.0 |0.0 |1.0 | |1.2 |1.3 |1.0 |1.0 | |1.5 |NaN |2.0 |2.0 | |NaN |1.0 |3.0 |1.0 | |NaN |0.0 |3.0 |0.0 | +-------+-------+--------+--------+ ... """
Param(Params._dummy(), "splits", "Split points for mapping continuous features into buckets. With n+1 splits, " + "there are n buckets. A bucket defined by splits x,y holds values in the " + "range [x,y) except the last bucket, which also includes y. The splits " + "should be of length >= 3 and strictly increasing. Values at -inf, inf must be " + "explicitly provided to cover all Double values; otherwise, values outside the " + "splits specified will be treated as errors.", typeConverter=TypeConverters.toListFloat)
"containing NaN values. Values outside the splits will always be treated " "as errors. Options are 'skip' (filter out rows with invalid values), " + "'error' (throw an error), or 'keep' (keep invalid values in a " + "special additional bucket). Note that in the multiple column " + "case, the invalid handling is applied to all columns. That said " + "for 'error' it will throw an error if any invalids are found in " + "any column, for 'skip' it will skip rows with any invalids in " + "any columns, etc.", typeConverter=TypeConverters.toString)
"continuous features into buckets for multiple columns. For each input " + "column, with n+1 splits, there are n buckets. A bucket defined by " + "splits x,y holds values in the range [x,y) except the last bucket, " + "which also includes y. The splits should be of length >= 3 and " + "strictly increasing. Values at -inf, inf must be explicitly provided " + "to cover all Double values; otherwise, values outside the splits " + "specified will be treated as errors.", typeConverter=TypeConverters.toListListFloat)
splitsArray=None, inputCols=None, outputCols=None): """ __init__(self, \\*, splits=None, inputCol=None, outputCol=None, handleInvalid="error", \ splitsArray=None, inputCols=None, outputCols=None) """
splitsArray=None, inputCols=None, outputCols=None): """ setParams(self, \\*, splits=None, inputCol=None, outputCol=None, handleInvalid="error", \ splitsArray=None, inputCols=None, outputCols=None) Sets params for this Bucketizer. """
def setSplits(self, value): """ Sets the value of :py:attr:`splits`. """
def getSplits(self): """ Gets the value of threshold or its default value. """
def setSplitsArray(self, value): """ Sets the value of :py:attr:`splitsArray`. """ return self._set(splitsArray=value)
def getSplitsArray(self): """ Gets the array of split points or its default value. """
""" Sets the value of :py:attr:`inputCol`. """
def setInputCols(self, value): """ Sets the value of :py:attr:`inputCols`. """ return self._set(inputCols=value)
""" Sets the value of :py:attr:`outputCol`. """
def setOutputCols(self, value): """ Sets the value of :py:attr:`outputCols`. """ return self._set(outputCols=value)
""" Sets the value of :py:attr:`handleInvalid`. """
""" Params for :py:class:`CountVectorizer` and :py:class:`CountVectorizerModel`. """
Params._dummy(), "minTF", "Filter to ignore rare words in" + " a document. For each document, terms with frequency/count less than the given" + " threshold are ignored. If this is an integer >= 1, then this specifies a count (of" + " times the term must appear in the document); if this is a double in [0,1), then this " + "specifies a fraction (out of the document's token count). Note that the parameter is " + "only used in transform of CountVectorizerModel and does not affect fitting. Default 1.0", typeConverter=TypeConverters.toFloat) Params._dummy(), "minDF", "Specifies the minimum number of" + " different documents a term must appear in to be included in the vocabulary." + " If this is an integer >= 1, this specifies the number of documents the term must" + " appear in; if this is a double in [0,1), then this specifies the fraction of documents." + " Default 1.0", typeConverter=TypeConverters.toFloat) Params._dummy(), "maxDF", "Specifies the maximum number of" + " different documents a term could appear in to be included in the vocabulary." + " A term that appears more than the threshold will be ignored. If this is an" + " integer >= 1, this specifies the maximum number of documents the term could appear in;" + " if this is a double in [0,1), then this specifies the maximum" + " fraction of documents the term could appear in." + " Default (2^63) - 1", typeConverter=TypeConverters.toFloat) Params._dummy(), "vocabSize", "max size of the vocabulary. Default 1 << 18.", typeConverter=TypeConverters.toInt) Params._dummy(), "binary", "Binary toggle to control the output vector values." + " If True, all nonzero counts (after minTF filter applied) are set to 1. This is useful" + " for discrete probabilistic models that model binary events rather than integer counts." + " Default False", typeConverter=TypeConverters.toBoolean)
def getMinTF(self): """ Gets the value of minTF or its default value. """
def getMinDF(self): """ Gets the value of minDF or its default value. """
def getMaxDF(self): """ Gets the value of maxDF or its default value. """ return self.getOrDefault(self.maxDF)
def getVocabSize(self): """ Gets the value of vocabSize or its default value. """
def getBinary(self): """ Gets the value of binary or its default value. """ return self.getOrDefault(self.binary)
""" Extracts a vocabulary from document collections and generates a :py:attr:`CountVectorizerModel`.
.. versionadded:: 1.6.0
Examples -------- >>> df = spark.createDataFrame( ... [(0, ["a", "b", "c"]), (1, ["a", "b", "b", "c", "a"])], ... ["label", "raw"]) >>> cv = CountVectorizer() >>> cv.setInputCol("raw") CountVectorizer... >>> cv.setOutputCol("vectors") CountVectorizer... >>> model = cv.fit(df) >>> model.setInputCol("raw") CountVectorizerModel... >>> model.transform(df).show(truncate=False) +-----+---------------+-------------------------+ |label|raw |vectors | +-----+---------------+-------------------------+ |0 |[a, b, c] |(3,[0,1,2],[1.0,1.0,1.0])| |1 |[a, b, b, c, a]|(3,[0,1,2],[2.0,2.0,1.0])| +-----+---------------+-------------------------+ ... >>> sorted(model.vocabulary) == ['a', 'b', 'c'] True >>> countVectorizerPath = temp_path + "/count-vectorizer" >>> cv.save(countVectorizerPath) >>> loadedCv = CountVectorizer.load(countVectorizerPath) >>> loadedCv.getMinDF() == cv.getMinDF() True >>> loadedCv.getMinTF() == cv.getMinTF() True >>> loadedCv.getVocabSize() == cv.getVocabSize() True >>> modelPath = temp_path + "/count-vectorizer-model" >>> model.save(modelPath) >>> loadedModel = CountVectorizerModel.load(modelPath) >>> loadedModel.vocabulary == model.vocabulary True >>> loadedModel.transform(df).take(1) == model.transform(df).take(1) True >>> fromVocabModel = CountVectorizerModel.from_vocabulary(["a", "b", "c"], ... inputCol="raw", outputCol="vectors") >>> fromVocabModel.transform(df).show(truncate=False) +-----+---------------+-------------------------+ |label|raw |vectors | +-----+---------------+-------------------------+ |0 |[a, b, c] |(3,[0,1,2],[1.0,1.0,1.0])| |1 |[a, b, b, c, a]|(3,[0,1,2],[2.0,2.0,1.0])| +-----+---------------+-------------------------+ ... """
binary=False, inputCol=None, outputCol=None): """ __init__(self, \\*, minTF=1.0, minDF=1.0, maxDF=2 ** 63 - 1, vocabSize=1 << 18,\ binary=False, inputCol=None,outputCol=None) """ self.uid)
binary=False, inputCol=None, outputCol=None): """ setParams(self, \\*, minTF=1.0, minDF=1.0, maxDF=2 ** 63 - 1, vocabSize=1 << 18,\ binary=False, inputCol=None, outputCol=None) Set the params for the CountVectorizer """
def setMinTF(self, value): """ Sets the value of :py:attr:`minTF`. """ return self._set(minTF=value)
def setMinDF(self, value): """ Sets the value of :py:attr:`minDF`. """ return self._set(minDF=value)
def setMaxDF(self, value): """ Sets the value of :py:attr:`maxDF`. """
def setVocabSize(self, value): """ Sets the value of :py:attr:`vocabSize`. """ return self._set(vocabSize=value)
def setBinary(self, value): """ Sets the value of :py:attr:`binary`. """ return self._set(binary=value)
""" Sets the value of :py:attr:`inputCol`. """
""" Sets the value of :py:attr:`outputCol`. """
""" Model fitted by :py:class:`CountVectorizer`.
.. versionadded:: 1.6.0 """
def setInputCol(self, value): """ Sets the value of :py:attr:`inputCol`. """
def setOutputCol(self, value): """ Sets the value of :py:attr:`outputCol`. """
""" Construct the model directly from a vocabulary list of strings, requires an active SparkContext. """ "org.apache.spark.ml.feature.CountVectorizerModel", jvocab) model.setBinary(binary)
def vocabulary(self): """ An array of terms in the vocabulary. """
def setMinTF(self, value): """ Sets the value of :py:attr:`minTF`. """
def setBinary(self, value): """ Sets the value of :py:attr:`binary`. """ return self._set(binary=value)
""" A feature transformer that takes the 1D discrete cosine transform of a real vector. No zero padding is performed on the input vector. It returns a real vector of the same length representing the DCT. The return vector is scaled such that the transform matrix is unitary (aka scaled DCT-II).
.. versionadded:: 1.6.0
Notes ----- `More information on Wikipedia \ <https://en.wikipedia.org/wiki/Discrete_cosine_transform#DCT-II Wikipedia>`_.
Examples -------- >>> from pyspark.ml.linalg import Vectors >>> df1 = spark.createDataFrame([(Vectors.dense([5.0, 8.0, 6.0]),)], ["vec"]) >>> dct = DCT( ) >>> dct.setInverse(False) DCT... >>> dct.setInputCol("vec") DCT... >>> dct.setOutputCol("resultVec") DCT... >>> df2 = dct.transform(df1) >>> df2.head().resultVec DenseVector([10.969..., -0.707..., -2.041...]) >>> df3 = DCT(inverse=True, inputCol="resultVec", outputCol="origVec").transform(df2) >>> df3.head().origVec DenseVector([5.0, 8.0, 6.0]) >>> dctPath = temp_path + "/dct" >>> dct.save(dctPath) >>> loadedDtc = DCT.load(dctPath) >>> loadedDtc.transform(df1).take(1) == dct.transform(df1).take(1) True >>> loadedDtc.getInverse() False """
"default False.", typeConverter=TypeConverters.toBoolean)
""" __init__(self, \\*, inverse=False, inputCol=None, outputCol=None) """
""" setParams(self, \\*, inverse=False, inputCol=None, outputCol=None) Sets params for this DCT. """
def setInverse(self, value): """ Sets the value of :py:attr:`inverse`. """
def getInverse(self): """ Gets the value of inverse or its default value. """
""" Sets the value of :py:attr:`inputCol`. """
""" Sets the value of :py:attr:`outputCol`. """
JavaMLWritable): """ Outputs the Hadamard product (i.e., the element-wise product) of each input vector with a provided "weight" vector. In other words, it scales each column of the dataset by a scalar multiplier.
.. versionadded:: 1.5.0
Examples -------- >>> from pyspark.ml.linalg import Vectors >>> df = spark.createDataFrame([(Vectors.dense([2.0, 1.0, 3.0]),)], ["values"]) >>> ep = ElementwiseProduct() >>> ep.setScalingVec(Vectors.dense([1.0, 2.0, 3.0])) ElementwiseProduct... >>> ep.setInputCol("values") ElementwiseProduct... >>> ep.setOutputCol("eprod") ElementwiseProduct... >>> ep.transform(df).head().eprod DenseVector([2.0, 2.0, 9.0]) >>> ep.setParams(scalingVec=Vectors.dense([2.0, 3.0, 5.0])).transform(df).head().eprod DenseVector([4.0, 3.0, 15.0]) >>> elementwiseProductPath = temp_path + "/elementwise-product" >>> ep.save(elementwiseProductPath) >>> loadedEp = ElementwiseProduct.load(elementwiseProductPath) >>> loadedEp.getScalingVec() == ep.getScalingVec() True >>> loadedEp.transform(df).take(1) == ep.transform(df).take(1) True """
typeConverter=TypeConverters.toVector)
""" __init__(self, \\*, scalingVec=None, inputCol=None, outputCol=None) """ self.uid)
""" setParams(self, \\*, scalingVec=None, inputCol=None, outputCol=None) Sets params for this ElementwiseProduct. """
def setScalingVec(self, value): """ Sets the value of :py:attr:`scalingVec`. """
def getScalingVec(self): """ Gets the value of scalingVec or its default value. """
""" Sets the value of :py:attr:`inputCol`. """
""" Sets the value of :py:attr:`outputCol`. """
JavaMLWritable): """ Feature hashing projects a set of categorical or numerical features into a feature vector of specified dimension (typically substantially smaller than that of the original feature space). This is done using the hashing trick (https://en.wikipedia.org/wiki/Feature_hashing) to map features to indices in the feature vector.
The FeatureHasher transformer operates on multiple columns. Each column may contain either numeric or categorical features. Behavior and handling of column data types is as follows:
* Numeric columns: For numeric features, the hash value of the column name is used to map the feature value to its index in the feature vector. By default, numeric features are not treated as categorical (even when they are integers). To treat them as categorical, specify the relevant columns in `categoricalCols`.
* String columns: For categorical features, the hash value of the string "column_name=value" is used to map to the vector index, with an indicator value of `1.0`. Thus, categorical features are "one-hot" encoded (similarly to using :py:class:`OneHotEncoder` with `dropLast=false`).
* Boolean columns: Boolean values are treated in the same way as string columns. That is, boolean features are represented as "column_name=true" or "column_name=false", with an indicator value of `1.0`.
Null (missing) values are ignored (implicitly zero in the resulting feature vector).
Since a simple modulo is used to transform the hash function to a vector index, it is advisable to use a power of two as the `numFeatures` parameter; otherwise the features will not be mapped evenly to the vector indices.
.. versionadded:: 2.3.0
Examples -------- >>> data = [(2.0, True, "1", "foo"), (3.0, False, "2", "bar")] >>> cols = ["real", "bool", "stringNum", "string"] >>> df = spark.createDataFrame(data, cols) >>> hasher = FeatureHasher() >>> hasher.setInputCols(cols) FeatureHasher... >>> hasher.setOutputCol("features") FeatureHasher... >>> hasher.transform(df).head().features SparseVector(262144, {174475: 2.0, 247670: 1.0, 257907: 1.0, 262126: 1.0}) >>> hasher.setCategoricalCols(["real"]).transform(df).head().features SparseVector(262144, {171257: 1.0, 247670: 1.0, 257907: 1.0, 262126: 1.0}) >>> hasherPath = temp_path + "/hasher" >>> hasher.save(hasherPath) >>> loadedHasher = FeatureHasher.load(hasherPath) >>> loadedHasher.getNumFeatures() == hasher.getNumFeatures() True >>> loadedHasher.transform(df).head().features == hasher.transform(df).head().features True """
"numeric columns to treat as categorical", typeConverter=TypeConverters.toListString)
categoricalCols=None): """ __init__(self, \\*, numFeatures=1 << 18, inputCols=None, outputCol=None, \ categoricalCols=None) """
categoricalCols=None): """ setParams(self, \\*, numFeatures=1 << 18, inputCols=None, outputCol=None, \ categoricalCols=None) Sets params for this FeatureHasher. """
def setCategoricalCols(self, value): """ Sets the value of :py:attr:`categoricalCols`. """
def getCategoricalCols(self): """ Gets the value of binary or its default value. """ return self.getOrDefault(self.categoricalCols)
""" Sets the value of :py:attr:`inputCols`. """
""" Sets the value of :py:attr:`outputCol`. """
""" Sets the value of :py:attr:`numFeatures`. """ return self._set(numFeatures=value)
JavaMLWritable): """ Maps a sequence of terms to their term frequencies using the hashing trick. Currently we use Austin Appleby's MurmurHash 3 algorithm (MurmurHash3_x86_32) to calculate the hash code value for the term object. Since a simple modulo is used to transform the hash function to a column index, it is advisable to use a power of two as the numFeatures parameter; otherwise the features will not be mapped evenly to the columns.
.. versionadded:: 1.3.0
Examples -------- >>> df = spark.createDataFrame([(["a", "b", "c"],)], ["words"]) >>> hashingTF = HashingTF(inputCol="words", outputCol="features") >>> hashingTF.setNumFeatures(10) HashingTF... >>> hashingTF.transform(df).head().features SparseVector(10, {5: 1.0, 7: 1.0, 8: 1.0}) >>> hashingTF.setParams(outputCol="freqs").transform(df).head().freqs SparseVector(10, {5: 1.0, 7: 1.0, 8: 1.0}) >>> params = {hashingTF.numFeatures: 5, hashingTF.outputCol: "vector"} >>> hashingTF.transform(df, params).head().vector SparseVector(5, {0: 1.0, 2: 1.0, 3: 1.0}) >>> hashingTFPath = temp_path + "/hashing-tf" >>> hashingTF.save(hashingTFPath) >>> loadedHashingTF = HashingTF.load(hashingTFPath) >>> loadedHashingTF.getNumFeatures() == hashingTF.getNumFeatures() True >>> loadedHashingTF.transform(df).take(1) == hashingTF.transform(df).take(1) True >>> hashingTF.indexOf("b") 5 """
"This is useful for discrete probabilistic models that model binary events " + "rather than integer counts. Default False.", typeConverter=TypeConverters.toBoolean)
""" __init__(self, \\*, numFeatures=1 << 18, binary=False, inputCol=None, outputCol=None) """
""" setParams(self, \\*, numFeatures=1 << 18, binary=False, inputCol=None, outputCol=None) Sets params for this HashingTF. """
def setBinary(self, value): """ Sets the value of :py:attr:`binary`. """
def getBinary(self): """ Gets the value of binary or its default value. """ return self.getOrDefault(self.binary)
""" Sets the value of :py:attr:`inputCol`. """
""" Sets the value of :py:attr:`outputCol`. """
""" Sets the value of :py:attr:`numFeatures`. """
def indexOf(self, term): """ Returns the index of the input term. """
""" Params for :py:class:`IDF` and :py:class:`IDFModel`.
.. versionadded:: 3.0.0 """
"minimum number of documents in which a term should appear for filtering", typeConverter=TypeConverters.toInt)
def getMinDocFreq(self): """ Gets the value of minDocFreq or its default value. """
""" Compute the Inverse Document Frequency (IDF) given a collection of documents.
.. versionadded:: 1.4.0
Examples -------- >>> from pyspark.ml.linalg import DenseVector >>> df = spark.createDataFrame([(DenseVector([1.0, 2.0]),), ... (DenseVector([0.0, 1.0]),), (DenseVector([3.0, 0.2]),)], ["tf"]) >>> idf = IDF(minDocFreq=3) >>> idf.setInputCol("tf") IDF... >>> idf.setOutputCol("idf") IDF... >>> model = idf.fit(df) >>> model.setOutputCol("idf") IDFModel... >>> model.getMinDocFreq() 3 >>> model.idf DenseVector([0.0, 0.0]) >>> model.docFreq [0, 3] >>> model.numDocs == df.count() True >>> model.transform(df).head().idf DenseVector([0.0, 0.0]) >>> idf.setParams(outputCol="freqs").fit(df).transform(df).collect()[1].freqs DenseVector([0.0, 0.0]) >>> params = {idf.minDocFreq: 1, idf.outputCol: "vector"} >>> idf.fit(df, params).transform(df).head().vector DenseVector([0.2877, 0.0]) >>> idfPath = temp_path + "/idf" >>> idf.save(idfPath) >>> loadedIdf = IDF.load(idfPath) >>> loadedIdf.getMinDocFreq() == idf.getMinDocFreq() True >>> modelPath = temp_path + "/idf-model" >>> model.save(modelPath) >>> loadedModel = IDFModel.load(modelPath) >>> loadedModel.transform(df).head().idf == model.transform(df).head().idf True """
""" __init__(self, \\*, minDocFreq=0, inputCol=None, outputCol=None) """
""" setParams(self, \\*, minDocFreq=0, inputCol=None, outputCol=None) Sets params for this IDF. """
def setMinDocFreq(self, value): """ Sets the value of :py:attr:`minDocFreq`. """ return self._set(minDocFreq=value)
""" Sets the value of :py:attr:`inputCol`. """
""" Sets the value of :py:attr:`outputCol`. """
""" Model fitted by :py:class:`IDF`.
.. versionadded:: 1.4.0 """
def setInputCol(self, value): """ Sets the value of :py:attr:`inputCol`. """ return self._set(inputCol=value)
def setOutputCol(self, value): """ Sets the value of :py:attr:`outputCol`. """
def idf(self): """ Returns the IDF vector. """
def docFreq(self): """ Returns the document frequency. """
def numDocs(self): """ Returns number of documents evaluated to compute idf """
""" Params for :py:class:`Imputer` and :py:class:`ImputerModel`.
.. versionadded:: 3.0.0 """
"strategy for imputation. If mean, then replace missing values using the mean " "value of the feature. If median, then replace missing values using the " "median value of the feature. If mode, then replace missing using the most " "frequent value of the feature.", typeConverter=TypeConverters.toString)
"The placeholder for the missing values. All occurrences of missingValue " "will be imputed.", typeConverter=TypeConverters.toFloat)
def getStrategy(self): """ Gets the value of :py:attr:`strategy` or its default value. """
def getMissingValue(self): """ Gets the value of :py:attr:`missingValue` or its default value. """
""" Imputation estimator for completing missing values, using the mean, median or mode of the columns in which the missing values are located. The input columns should be of numeric type. Currently Imputer does not support categorical features and possibly creates incorrect values for a categorical feature.
Note that the mean/median/mode value is computed after filtering out missing values. All Null values in the input columns are treated as missing, and so are also imputed. For computing median, :py:meth:`pyspark.sql.DataFrame.approxQuantile` is used with a relative error of `0.001`.
.. versionadded:: 2.2.0
Examples -------- >>> df = spark.createDataFrame([(1.0, float("nan")), (2.0, float("nan")), (float("nan"), 3.0), ... (4.0, 4.0), (5.0, 5.0)], ["a", "b"]) >>> imputer = Imputer() >>> imputer.setInputCols(["a", "b"]) Imputer... >>> imputer.setOutputCols(["out_a", "out_b"]) Imputer... >>> imputer.getRelativeError() 0.001 >>> model = imputer.fit(df) >>> model.setInputCols(["a", "b"]) ImputerModel... >>> model.getStrategy() 'mean' >>> model.surrogateDF.show() +---+---+ | a| b| +---+---+ |3.0|4.0| +---+---+ ... >>> model.transform(df).show() +---+---+-----+-----+ | a| b|out_a|out_b| +---+---+-----+-----+ |1.0|NaN| 1.0| 4.0| |2.0|NaN| 2.0| 4.0| |NaN|3.0| 3.0| 3.0| ... >>> imputer.setStrategy("median").setMissingValue(1.0).fit(df).transform(df).show() +---+---+-----+-----+ | a| b|out_a|out_b| +---+---+-----+-----+ |1.0|NaN| 4.0| NaN| ... >>> df1 = spark.createDataFrame([(1.0,), (2.0,), (float("nan"),), (4.0,), (5.0,)], ["a"]) >>> imputer1 = Imputer(inputCol="a", outputCol="out_a") >>> model1 = imputer1.fit(df1) >>> model1.surrogateDF.show() +---+ | a| +---+ |3.0| +---+ ... >>> model1.transform(df1).show() +---+-----+ | a|out_a| +---+-----+ |1.0| 1.0| |2.0| 2.0| |NaN| 3.0| ... >>> imputer1.setStrategy("median").setMissingValue(1.0).fit(df1).transform(df1).show() +---+-----+ | a|out_a| +---+-----+ |1.0| 4.0| ... >>> df2 = spark.createDataFrame([(float("nan"),), (float("nan"),), (3.0,), (4.0,), (5.0,)], ... ["b"]) >>> imputer2 = Imputer(inputCol="b", outputCol="out_b") >>> model2 = imputer2.fit(df2) >>> model2.surrogateDF.show() +---+ | b| +---+ |4.0| +---+ ... >>> model2.transform(df2).show() +---+-----+ | b|out_b| +---+-----+ |NaN| 4.0| |NaN| 4.0| |3.0| 3.0| ... >>> imputer2.setStrategy("median").setMissingValue(1.0).fit(df2).transform(df2).show() +---+-----+ | b|out_b| +---+-----+ |NaN| NaN| ... >>> imputerPath = temp_path + "/imputer" >>> imputer.save(imputerPath) >>> loadedImputer = Imputer.load(imputerPath) >>> loadedImputer.getStrategy() == imputer.getStrategy() True >>> loadedImputer.getMissingValue() 1.0 >>> modelPath = temp_path + "/imputer-model" >>> model.save(modelPath) >>> loadedModel = ImputerModel.load(modelPath) >>> loadedModel.transform(df).head().out_a == model.transform(df).head().out_a True """
outputCols=None, inputCol=None, outputCol=None, relativeError=0.001): """ __init__(self, \\*, strategy="mean", missingValue=float("nan"), inputCols=None, \ outputCols=None, inputCol=None, outputCol=None, relativeError=0.001): """
outputCols=None, inputCol=None, outputCol=None, relativeError=0.001): """ setParams(self, \\*, strategy="mean", missingValue=float("nan"), inputCols=None, \ outputCols=None, inputCol=None, outputCol=None, relativeError=0.001) Sets params for this Imputer. """
def setStrategy(self, value): """ Sets the value of :py:attr:`strategy`. """
def setMissingValue(self, value): """ Sets the value of :py:attr:`missingValue`. """
def setInputCols(self, value): """ Sets the value of :py:attr:`inputCols`. """
def setOutputCols(self, value): """ Sets the value of :py:attr:`outputCols`. """
def setInputCol(self, value): """ Sets the value of :py:attr:`inputCol`. """ return self._set(inputCol=value)
def setOutputCol(self, value): """ Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
def setRelativeError(self, value): """ Sets the value of :py:attr:`relativeError`. """ return self._set(relativeError=value)
""" Model fitted by :py:class:`Imputer`.
.. versionadded:: 2.2.0 """
def setInputCols(self, value): """ Sets the value of :py:attr:`inputCols`. """
def setOutputCols(self, value): """ Sets the value of :py:attr:`outputCols`. """ return self._set(outputCols=value)
def setInputCol(self, value): """ Sets the value of :py:attr:`inputCol`. """ return self._set(inputCol=value)
def setOutputCol(self, value): """ Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
def surrogateDF(self): """ Returns a DataFrame containing inputCols and their corresponding surrogates, which are used to replace the missing values in the input DataFrame. """
""" Implements the feature interaction transform. This transformer takes in Double and Vector type columns and outputs a flattened vector of their feature interactions. To handle interaction, we first one-hot encode any nominal features. Then, a vector of the feature cross-products is produced.
For example, given the input feature values `Double(2)` and `Vector(3, 4)`, the output would be `Vector(6, 8)` if all input features were numeric. If the first feature was instead nominal with four categories, the output would then be `Vector(0, 0, 0, 0, 3, 4, 0, 0)`.
.. versionadded:: 3.0.0
Examples -------- >>> df = spark.createDataFrame([(0.0, 1.0), (2.0, 3.0)], ["a", "b"]) >>> interaction = Interaction() >>> interaction.setInputCols(["a", "b"]) Interaction... >>> interaction.setOutputCol("ab") Interaction... >>> interaction.transform(df).show() +---+---+-----+ | a| b| ab| +---+---+-----+ |0.0|1.0|[0.0]| |2.0|3.0|[6.0]| +---+---+-----+ ... >>> interactionPath = temp_path + "/interaction" >>> interaction.save(interactionPath) >>> loadedInteraction = Interaction.load(interactionPath) >>> loadedInteraction.transform(df).head().ab == interaction.transform(df).head().ab True """
""" __init__(self, \\*, inputCols=None, outputCol=None): """
""" setParams(self, \\*, inputCols=None, outputCol=None) Sets params for this Interaction. """
def setInputCols(self, value): """ Sets the value of :py:attr:`inputCols`. """
def setOutputCol(self, value): """ Sets the value of :py:attr:`outputCol`. """
""" Params for :py:class:`MaxAbsScaler` and :py:class:`MaxAbsScalerModel`.
.. versionadded:: 3.0.0 """
""" Rescale each feature individually to range [-1, 1] by dividing through the largest maximum absolute value in each feature. It does not shift/center the data, and thus does not destroy any sparsity.
.. versionadded:: 2.0.0
Examples -------- >>> from pyspark.ml.linalg import Vectors >>> df = spark.createDataFrame([(Vectors.dense([1.0]),), (Vectors.dense([2.0]),)], ["a"]) >>> maScaler = MaxAbsScaler(outputCol="scaled") >>> maScaler.setInputCol("a") MaxAbsScaler... >>> model = maScaler.fit(df) >>> model.setOutputCol("scaledOutput") MaxAbsScalerModel... >>> model.transform(df).show() +-----+------------+ | a|scaledOutput| +-----+------------+ |[1.0]| [0.5]| |[2.0]| [1.0]| +-----+------------+ ... >>> scalerPath = temp_path + "/max-abs-scaler" >>> maScaler.save(scalerPath) >>> loadedMAScaler = MaxAbsScaler.load(scalerPath) >>> loadedMAScaler.getInputCol() == maScaler.getInputCol() True >>> loadedMAScaler.getOutputCol() == maScaler.getOutputCol() True >>> modelPath = temp_path + "/max-abs-scaler-model" >>> model.save(modelPath) >>> loadedModel = MaxAbsScalerModel.load(modelPath) >>> loadedModel.maxAbs == model.maxAbs True >>> loadedModel.transform(df).take(1) == model.transform(df).take(1) True """
""" __init__(self, \\*, inputCol=None, outputCol=None) """
""" setParams(self, \\*, inputCol=None, outputCol=None) Sets params for this MaxAbsScaler. """
""" Sets the value of :py:attr:`inputCol`. """
""" Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
""" Model fitted by :py:class:`MaxAbsScaler`.
.. versionadded:: 2.0.0 """
def setInputCol(self, value): """ Sets the value of :py:attr:`inputCol`. """ return self._set(inputCol=value)
def setOutputCol(self, value): """ Sets the value of :py:attr:`outputCol`. """
def maxAbs(self): """ Max Abs vector. """
""" LSH class for Jaccard distance. The input can be dense or sparse vectors, but it is more efficient if it is sparse. For example, `Vectors.sparse(10, [(2, 1.0), (3, 1.0), (5, 1.0)])` means there are 10 elements in the space. This set contains elements 2, 3, and 5. Also, any input vector must have at least 1 non-zero index, and all non-zero values are treated as binary "1" values.
.. versionadded:: 2.2.0
Notes ----- See `Wikipedia on MinHash <https://en.wikipedia.org/wiki/MinHash>`_
Examples -------- >>> from pyspark.ml.linalg import Vectors >>> from pyspark.sql.functions import col >>> data = [(0, Vectors.sparse(6, [0, 1, 2], [1.0, 1.0, 1.0]),), ... (1, Vectors.sparse(6, [2, 3, 4], [1.0, 1.0, 1.0]),), ... (2, Vectors.sparse(6, [0, 2, 4], [1.0, 1.0, 1.0]),)] >>> df = spark.createDataFrame(data, ["id", "features"]) >>> mh = MinHashLSH() >>> mh.setInputCol("features") MinHashLSH... >>> mh.setOutputCol("hashes") MinHashLSH... >>> mh.setSeed(12345) MinHashLSH... >>> model = mh.fit(df) >>> model.setInputCol("features") MinHashLSHModel... >>> model.transform(df).head() Row(id=0, features=SparseVector(6, {0: 1.0, 1: 1.0, 2: 1.0}), hashes=[DenseVector([6179668... >>> data2 = [(3, Vectors.sparse(6, [1, 3, 5], [1.0, 1.0, 1.0]),), ... (4, Vectors.sparse(6, [2, 3, 5], [1.0, 1.0, 1.0]),), ... (5, Vectors.sparse(6, [1, 2, 4], [1.0, 1.0, 1.0]),)] >>> df2 = spark.createDataFrame(data2, ["id", "features"]) >>> key = Vectors.sparse(6, [1, 2], [1.0, 1.0]) >>> model.approxNearestNeighbors(df2, key, 1).collect() [Row(id=5, features=SparseVector(6, {1: 1.0, 2: 1.0, 4: 1.0}), hashes=[DenseVector([6179668... >>> model.approxSimilarityJoin(df, df2, 0.6, distCol="JaccardDistance").select( ... col("datasetA.id").alias("idA"), ... col("datasetB.id").alias("idB"), ... col("JaccardDistance")).show() +---+---+---------------+ |idA|idB|JaccardDistance| +---+---+---------------+ | 0| 5| 0.5| | 1| 4| 0.5| +---+---+---------------+ ... >>> mhPath = temp_path + "/mh" >>> mh.save(mhPath) >>> mh2 = MinHashLSH.load(mhPath) >>> mh2.getOutputCol() == mh.getOutputCol() True >>> modelPath = temp_path + "/mh-model" >>> model.save(modelPath) >>> model2 = MinHashLSHModel.load(modelPath) >>> model.transform(df).head().hashes == model2.transform(df).head().hashes True """
""" __init__(self, \\*, inputCol=None, outputCol=None, seed=None, numHashTables=1) """
""" setParams(self, \\*, inputCol=None, outputCol=None, seed=None, numHashTables=1) Sets params for this MinHashLSH. """
""" Sets the value of :py:attr:`seed`. """
r""" Model produced by :py:class:`MinHashLSH`, where where multiple hash functions are stored. Each hash function is picked from the following family of hash functions, where :math:`a_i` and :math:`b_i` are randomly chosen integers less than prime: :math:`h_i(x) = ((x \cdot a_i + b_i) \mod prime)` This hash family is approximately min-wise independent according to the reference.
.. versionadded:: 2.2.0
Notes ----- See Tom Bohman, Colin Cooper, and Alan Frieze. "Min-wise independent linear permutations." Electronic Journal of Combinatorics 7 (2000): R26. """
""" Params for :py:class:`MinMaxScaler` and :py:class:`MinMaxScalerModel`.
.. versionadded:: 3.0.0 """
typeConverter=TypeConverters.toFloat) typeConverter=TypeConverters.toFloat)
def getMin(self): """ Gets the value of min or its default value. """
def getMax(self): """ Gets the value of max or its default value. """
""" Rescale each feature individually to a common range [min, max] linearly using column summary statistics, which is also known as min-max normalization or Rescaling. The rescaled value for feature E is calculated as,
Rescaled(e_i) = (e_i - E_min) / (E_max - E_min) * (max - min) + min
For the case E_max == E_min, Rescaled(e_i) = 0.5 * (max + min)
.. versionadded:: 1.6.0
Notes ----- Since zero values will probably be transformed to non-zero values, output of the transformer will be DenseVector even for sparse input.
Examples -------- >>> from pyspark.ml.linalg import Vectors >>> df = spark.createDataFrame([(Vectors.dense([0.0]),), (Vectors.dense([2.0]),)], ["a"]) >>> mmScaler = MinMaxScaler(outputCol="scaled") >>> mmScaler.setInputCol("a") MinMaxScaler... >>> model = mmScaler.fit(df) >>> model.setOutputCol("scaledOutput") MinMaxScalerModel... >>> model.originalMin DenseVector([0.0]) >>> model.originalMax DenseVector([2.0]) >>> model.transform(df).show() +-----+------------+ | a|scaledOutput| +-----+------------+ |[0.0]| [0.0]| |[2.0]| [1.0]| +-----+------------+ ... >>> minMaxScalerPath = temp_path + "/min-max-scaler" >>> mmScaler.save(minMaxScalerPath) >>> loadedMMScaler = MinMaxScaler.load(minMaxScalerPath) >>> loadedMMScaler.getMin() == mmScaler.getMin() True >>> loadedMMScaler.getMax() == mmScaler.getMax() True >>> modelPath = temp_path + "/min-max-scaler-model" >>> model.save(modelPath) >>> loadedModel = MinMaxScalerModel.load(modelPath) >>> loadedModel.originalMin == model.originalMin True >>> loadedModel.originalMax == model.originalMax True >>> loadedModel.transform(df).take(1) == model.transform(df).take(1) True """
""" __init__(self, \\*, min=0.0, max=1.0, inputCol=None, outputCol=None) """
""" setParams(self, \\*, min=0.0, max=1.0, inputCol=None, outputCol=None) Sets params for this MinMaxScaler. """
def setMin(self, value): """ Sets the value of :py:attr:`min`. """ return self._set(min=value)
def setMax(self, value): """ Sets the value of :py:attr:`max`. """ return self._set(max=value)
""" Sets the value of :py:attr:`inputCol`. """
""" Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
""" Model fitted by :py:class:`MinMaxScaler`.
.. versionadded:: 1.6.0 """
def setInputCol(self, value): """ Sets the value of :py:attr:`inputCol`. """ return self._set(inputCol=value)
def setOutputCol(self, value): """ Sets the value of :py:attr:`outputCol`. """
def setMin(self, value): """ Sets the value of :py:attr:`min`. """ return self._set(min=value)
def setMax(self, value): """ Sets the value of :py:attr:`max`. """ return self._set(max=value)
def originalMin(self): """ Min value for each original column during fitting. """
def originalMax(self): """ Max value for each original column during fitting. """
""" A feature transformer that converts the input array of strings into an array of n-grams. Null values in the input array are ignored. It returns an array of n-grams where each n-gram is represented by a space-separated string of words. When the input is empty, an empty array is returned. When the input array length is less than n (number of elements per n-gram), no n-grams are returned.
.. versionadded:: 1.5.0
Examples -------- >>> df = spark.createDataFrame([Row(inputTokens=["a", "b", "c", "d", "e"])]) >>> ngram = NGram(n=2) >>> ngram.setInputCol("inputTokens") NGram... >>> ngram.setOutputCol("nGrams") NGram... >>> ngram.transform(df).head() Row(inputTokens=['a', 'b', 'c', 'd', 'e'], nGrams=['a b', 'b c', 'c d', 'd e']) >>> # Change n-gram length >>> ngram.setParams(n=4).transform(df).head() Row(inputTokens=['a', 'b', 'c', 'd', 'e'], nGrams=['a b c d', 'b c d e']) >>> # Temporarily modify output column. >>> ngram.transform(df, {ngram.outputCol: "output"}).head() Row(inputTokens=['a', 'b', 'c', 'd', 'e'], output=['a b c d', 'b c d e']) >>> ngram.transform(df).head() Row(inputTokens=['a', 'b', 'c', 'd', 'e'], nGrams=['a b c d', 'b c d e']) >>> # Must use keyword arguments to specify params. >>> ngram.setParams("text") Traceback (most recent call last): ... TypeError: Method setParams forces keyword arguments. >>> ngramPath = temp_path + "/ngram" >>> ngram.save(ngramPath) >>> loadedNGram = NGram.load(ngramPath) >>> loadedNGram.getN() == ngram.getN() True >>> loadedNGram.transform(df).take(1) == ngram.transform(df).take(1) True """
typeConverter=TypeConverters.toInt)
""" __init__(self, \\*, n=2, inputCol=None, outputCol=None) """
""" setParams(self, \\*, n=2, inputCol=None, outputCol=None) Sets params for this NGram. """
def setN(self, value): """ Sets the value of :py:attr:`n`. """ return self._set(n=value)
def getN(self): """ Gets the value of n or its default value. """
""" Sets the value of :py:attr:`inputCol`. """
""" Sets the value of :py:attr:`outputCol`. """
""" Normalize a vector to have unit norm using the given p-norm.
.. versionadded:: 1.4.0
Examples -------- >>> from pyspark.ml.linalg import Vectors >>> svec = Vectors.sparse(4, {1: 4.0, 3: 3.0}) >>> df = spark.createDataFrame([(Vectors.dense([3.0, -4.0]), svec)], ["dense", "sparse"]) >>> normalizer = Normalizer(p=2.0) >>> normalizer.setInputCol("dense") Normalizer... >>> normalizer.setOutputCol("features") Normalizer... >>> normalizer.transform(df).head().features DenseVector([0.6, -0.8]) >>> normalizer.setParams(inputCol="sparse", outputCol="freqs").transform(df).head().freqs SparseVector(4, {1: 0.8, 3: 0.6}) >>> params = {normalizer.p: 1.0, normalizer.inputCol: "dense", normalizer.outputCol: "vector"} >>> normalizer.transform(df, params).head().vector DenseVector([0.4286, -0.5714]) >>> normalizerPath = temp_path + "/normalizer" >>> normalizer.save(normalizerPath) >>> loadedNormalizer = Normalizer.load(normalizerPath) >>> loadedNormalizer.getP() == normalizer.getP() True >>> loadedNormalizer.transform(df).take(1) == normalizer.transform(df).take(1) True """
typeConverter=TypeConverters.toFloat)
""" __init__(self, \\*, p=2.0, inputCol=None, outputCol=None) """
""" setParams(self, \\*, p=2.0, inputCol=None, outputCol=None) Sets params for this Normalizer. """
def setP(self, value): """ Sets the value of :py:attr:`p`. """ return self._set(p=value)
def getP(self): """ Gets the value of p or its default value. """
""" Sets the value of :py:attr:`inputCol`. """
""" Sets the value of :py:attr:`outputCol`. """
HasHandleInvalid): """ Params for :py:class:`OneHotEncoder` and :py:class:`OneHotEncoderModel`.
.. versionadded:: 3.0.0 """
"transform(). Options are 'keep' (invalid data presented as an extra " + "categorical feature) or error (throw an error). Note that this Param " + "is only used during transform; during fitting, invalid data will " + "result in an error.", typeConverter=TypeConverters.toString)
typeConverter=TypeConverters.toBoolean)
def getDropLast(self): """ Gets the value of dropLast or its default value. """ return self.getOrDefault(self.dropLast)
""" A one-hot encoder that maps a column of category indices to a column of binary vectors, with at most a single one-value per row that indicates the input category index. For example with 5 categories, an input value of 2.0 would map to an output vector of `[0.0, 0.0, 1.0, 0.0]`. The last category is not included by default (configurable via :py:attr:`dropLast`), because it makes the vector entries sum up to one, and hence linearly dependent. So an input value of 4.0 maps to `[0.0, 0.0, 0.0, 0.0]`.
When :py:attr:`handleInvalid` is configured to 'keep', an extra "category" indicating invalid values is added as last category. So when :py:attr:`dropLast` is true, invalid values are encoded as all-zeros vector.
.. versionadded:: 2.3.0
Notes ----- This is different from scikit-learn's OneHotEncoder, which keeps all categories. The output vectors are sparse.
When encoding multi-column by using :py:attr:`inputCols` and :py:attr:`outputCols` params, input/output cols come in pairs, specified by the order in the arrays, and each pair is treated independently.
See Also -------- StringIndexer : for converting categorical values into category indices
Examples -------- >>> from pyspark.ml.linalg import Vectors >>> df = spark.createDataFrame([(0.0,), (1.0,), (2.0,)], ["input"]) >>> ohe = OneHotEncoder() >>> ohe.setInputCols(["input"]) OneHotEncoder... >>> ohe.setOutputCols(["output"]) OneHotEncoder... >>> model = ohe.fit(df) >>> model.setOutputCols(["output"]) OneHotEncoderModel... >>> model.getHandleInvalid() 'error' >>> model.transform(df).head().output SparseVector(2, {0: 1.0}) >>> single_col_ohe = OneHotEncoder(inputCol="input", outputCol="output") >>> single_col_model = single_col_ohe.fit(df) >>> single_col_model.transform(df).head().output SparseVector(2, {0: 1.0}) >>> ohePath = temp_path + "/ohe" >>> ohe.save(ohePath) >>> loadedOHE = OneHotEncoder.load(ohePath) >>> loadedOHE.getInputCols() == ohe.getInputCols() True >>> modelPath = temp_path + "/ohe-model" >>> model.save(modelPath) >>> loadedModel = OneHotEncoderModel.load(modelPath) >>> loadedModel.categorySizes == model.categorySizes True >>> loadedModel.transform(df).take(1) == model.transform(df).take(1) True """
inputCol=None, outputCol=None): """ __init__(self, \\*, inputCols=None, outputCols=None, handleInvalid="error", dropLast=True, \ inputCol=None, outputCol=None) """ "org.apache.spark.ml.feature.OneHotEncoder", self.uid)
dropLast=True, inputCol=None, outputCol=None): """ setParams(self, \\*, inputCols=None, outputCols=None, handleInvalid="error", \ dropLast=True, inputCol=None, outputCol=None) Sets params for this OneHotEncoder. """
def setDropLast(self, value): """ Sets the value of :py:attr:`dropLast`. """ return self._set(dropLast=value)
def setInputCols(self, value): """ Sets the value of :py:attr:`inputCols`. """
def setOutputCols(self, value): """ Sets the value of :py:attr:`outputCols`. """
def setHandleInvalid(self, value): """ Sets the value of :py:attr:`handleInvalid`. """ return self._set(handleInvalid=value)
def setInputCol(self, value): """ Sets the value of :py:attr:`inputCol`. """ return self._set(inputCol=value)
def setOutputCol(self, value): """ Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
""" Model fitted by :py:class:`OneHotEncoder`.
.. versionadded:: 2.3.0 """
def setDropLast(self, value): """ Sets the value of :py:attr:`dropLast`. """ return self._set(dropLast=value)
def setInputCols(self, value): """ Sets the value of :py:attr:`inputCols`. """ return self._set(inputCols=value)
def setOutputCols(self, value): """ Sets the value of :py:attr:`outputCols`. """
def setInputCol(self, value): """ Sets the value of :py:attr:`inputCol`. """ return self._set(inputCol=value)
def setOutputCol(self, value): """ Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
def setHandleInvalid(self, value): """ Sets the value of :py:attr:`handleInvalid`. """ return self._set(handleInvalid=value)
def categorySizes(self): """ Original number of categories for each feature being encoded. The array contains one value for each input column, in order. """
JavaMLWritable): """ Perform feature expansion in a polynomial space. As said in `wikipedia of Polynomial Expansion <http://en.wikipedia.org/wiki/Polynomial_expansion>`_, "In mathematics, an expansion of a product of sums expresses it as a sum of products by using the fact that multiplication distributes over addition". Take a 2-variable feature vector as an example: `(x, y)`, if we want to expand it with degree 2, then we get `(x, x * x, y, x * y, y * y)`.
.. versionadded:: 1.4.0
Examples -------- >>> from pyspark.ml.linalg import Vectors >>> df = spark.createDataFrame([(Vectors.dense([0.5, 2.0]),)], ["dense"]) >>> px = PolynomialExpansion(degree=2) >>> px.setInputCol("dense") PolynomialExpansion... >>> px.setOutputCol("expanded") PolynomialExpansion... >>> px.transform(df).head().expanded DenseVector([0.5, 0.25, 2.0, 1.0, 4.0]) >>> px.setParams(outputCol="test").transform(df).head().test DenseVector([0.5, 0.25, 2.0, 1.0, 4.0]) >>> polyExpansionPath = temp_path + "/poly-expansion" >>> px.save(polyExpansionPath) >>> loadedPx = PolynomialExpansion.load(polyExpansionPath) >>> loadedPx.getDegree() == px.getDegree() True >>> loadedPx.transform(df).take(1) == px.transform(df).take(1) True """
typeConverter=TypeConverters.toInt)
""" __init__(self, \\*, degree=2, inputCol=None, outputCol=None) """ "org.apache.spark.ml.feature.PolynomialExpansion", self.uid)
""" setParams(self, \\*, degree=2, inputCol=None, outputCol=None) Sets params for this PolynomialExpansion. """
def setDegree(self, value): """ Sets the value of :py:attr:`degree`. """ return self._set(degree=value)
def getDegree(self): """ Gets the value of degree or its default value. """
""" Sets the value of :py:attr:`inputCol`. """
""" Sets the value of :py:attr:`outputCol`. """
HasHandleInvalid, HasRelativeError, JavaMLReadable, JavaMLWritable): """ :py:class:`QuantileDiscretizer` takes a column with continuous features and outputs a column with binned categorical features. The number of bins can be set using the :py:attr:`numBuckets` parameter. It is possible that the number of buckets used will be less than this value, for example, if there are too few distinct values of the input to create enough distinct quantiles. Since 3.0.0, :py:class:`QuantileDiscretizer` can map multiple columns at once by setting the :py:attr:`inputCols` parameter. If both of the :py:attr:`inputCol` and :py:attr:`inputCols` parameters are set, an Exception will be thrown. To specify the number of buckets for each column, the :py:attr:`numBucketsArray` parameter can be set, or if the number of buckets should be the same across columns, :py:attr:`numBuckets` can be set as a convenience.
.. versionadded:: 2.0.0
Notes ----- NaN handling: Note also that :py:class:`QuantileDiscretizer` will raise an error when it finds NaN values in the dataset, but the user can also choose to either keep or remove NaN values within the dataset by setting :py:attr:`handleInvalid` parameter. If the user chooses to keep NaN values, they will be handled specially and placed into their own bucket, for example, if 4 buckets are used, then non-NaN data will be put into buckets[0-3], but NaNs will be counted in a special bucket[4].
Algorithm: The bin ranges are chosen using an approximate algorithm (see the documentation for :py:meth:`~.DataFrameStatFunctions.approxQuantile` for a detailed description). The precision of the approximation can be controlled with the :py:attr:`relativeError` parameter. The lower and upper bin bounds will be `-Infinity` and `+Infinity`, covering all real values.
Examples -------- >>> values = [(0.1,), (0.4,), (1.2,), (1.5,), (float("nan"),), (float("nan"),)] >>> df1 = spark.createDataFrame(values, ["values"]) >>> qds1 = QuantileDiscretizer(inputCol="values", outputCol="buckets") >>> qds1.setNumBuckets(2) QuantileDiscretizer... >>> qds1.setRelativeError(0.01) QuantileDiscretizer... >>> qds1.setHandleInvalid("error") QuantileDiscretizer... >>> qds1.getRelativeError() 0.01 >>> bucketizer = qds1.fit(df1) >>> qds1.setHandleInvalid("keep").fit(df1).transform(df1).count() 6 >>> qds1.setHandleInvalid("skip").fit(df1).transform(df1).count() 4 >>> splits = bucketizer.getSplits() >>> splits[0] -inf >>> print("%2.1f" % round(splits[1], 1)) 0.4 >>> bucketed = bucketizer.transform(df1).head() >>> bucketed.buckets 0.0 >>> quantileDiscretizerPath = temp_path + "/quantile-discretizer" >>> qds1.save(quantileDiscretizerPath) >>> loadedQds = QuantileDiscretizer.load(quantileDiscretizerPath) >>> loadedQds.getNumBuckets() == qds1.getNumBuckets() True >>> inputs = [(0.1, 0.0), (0.4, 1.0), (1.2, 1.3), (1.5, 1.5), ... (float("nan"), float("nan")), (float("nan"), float("nan"))] >>> df2 = spark.createDataFrame(inputs, ["input1", "input2"]) >>> qds2 = QuantileDiscretizer(relativeError=0.01, handleInvalid="error", numBuckets=2, ... inputCols=["input1", "input2"], outputCols=["output1", "output2"]) >>> qds2.getRelativeError() 0.01 >>> qds2.setHandleInvalid("keep").fit(df2).transform(df2).show() +------+------+-------+-------+ |input1|input2|output1|output2| +------+------+-------+-------+ | 0.1| 0.0| 0.0| 0.0| | 0.4| 1.0| 1.0| 1.0| | 1.2| 1.3| 1.0| 1.0| | 1.5| 1.5| 1.0| 1.0| | NaN| NaN| 2.0| 2.0| | NaN| NaN| 2.0| 2.0| +------+------+-------+-------+ ... >>> qds3 = QuantileDiscretizer(relativeError=0.01, handleInvalid="error", ... numBucketsArray=[5, 10], inputCols=["input1", "input2"], ... outputCols=["output1", "output2"]) >>> qds3.setHandleInvalid("skip").fit(df2).transform(df2).show() +------+------+-------+-------+ |input1|input2|output1|output2| +------+------+-------+-------+ | 0.1| 0.0| 1.0| 1.0| | 0.4| 1.0| 2.0| 2.0| | 1.2| 1.3| 3.0| 3.0| | 1.5| 1.5| 4.0| 4.0| +------+------+-------+-------+ ... """
"Maximum number of buckets (quantiles, or " + "categories) into which data points are grouped. Must be >= 2.", typeConverter=TypeConverters.toInt)
"Options are skip (filter out rows with invalid values), " + "error (throw an error), or keep (keep invalid values in a special " + "additional bucket). Note that in the multiple columns " + "case, the invalid handling is applied to all columns. That said " + "for 'error' it will throw an error if any invalids are found in " + "any columns, for 'skip' it will skip rows with any invalids in " + "any columns, etc.", typeConverter=TypeConverters.toString)
"(quantiles, or categories) into which data points are grouped. " + "This is for multiple columns input. If transforming multiple " + "columns and numBucketsArray is not set, but numBuckets is set, " + "then numBuckets will be applied across all columns.", typeConverter=TypeConverters.toListInt)
handleInvalid="error", numBucketsArray=None, inputCols=None, outputCols=None): """ __init__(self, \\*, numBuckets=2, inputCol=None, outputCol=None, relativeError=0.001, \ handleInvalid="error", numBucketsArray=None, inputCols=None, outputCols=None) """ self.uid)
handleInvalid="error", numBucketsArray=None, inputCols=None, outputCols=None): """ setParams(self, \\*, numBuckets=2, inputCol=None, outputCol=None, relativeError=0.001, \ handleInvalid="error", numBucketsArray=None, inputCols=None, outputCols=None) Set the params for the QuantileDiscretizer """
def setNumBuckets(self, value): """ Sets the value of :py:attr:`numBuckets`. """
def getNumBuckets(self): """ Gets the value of numBuckets or its default value. """
def setNumBucketsArray(self, value): """ Sets the value of :py:attr:`numBucketsArray`. """ return self._set(numBucketsArray=value)
def getNumBucketsArray(self): """ Gets the value of numBucketsArray or its default value. """ return self.getOrDefault(self.numBucketsArray)
def setRelativeError(self, value): """ Sets the value of :py:attr:`relativeError`. """
""" Sets the value of :py:attr:`inputCol`. """ return self._set(inputCol=value)
def setInputCols(self, value): """ Sets the value of :py:attr:`inputCols`. """ return self._set(inputCols=value)
""" Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
def setOutputCols(self, value): """ Sets the value of :py:attr:`outputCols`. """ return self._set(outputCols=value)
""" Sets the value of :py:attr:`handleInvalid`. """
""" Private method to convert the java_model to a Python model. """ inputCol=self.getInputCol(), outputCol=self.getOutputCol(), handleInvalid=self.getHandleInvalid()) else: inputCols=self.getInputCols(), outputCols=self.getOutputCols(), handleInvalid=self.getHandleInvalid())
""" Params for :py:class:`RobustScaler` and :py:class:`RobustScalerModel`.
.. versionadded:: 3.0.0 """
typeConverter=TypeConverters.toFloat) typeConverter=TypeConverters.toFloat) typeConverter=TypeConverters.toBoolean) "quantile range", typeConverter=TypeConverters.toBoolean)
relativeError=0.001)
def getLower(self): """ Gets the value of lower or its default value. """ return self.getOrDefault(self.lower)
def getUpper(self): """ Gets the value of upper or its default value. """ return self.getOrDefault(self.upper)
def getWithCentering(self): """ Gets the value of withCentering or its default value. """
def getWithScaling(self): """ Gets the value of withScaling or its default value. """
""" RobustScaler removes the median and scales the data according to the quantile range. The quantile range is by default IQR (Interquartile Range, quantile range between the 1st quartile = 25th quantile and the 3rd quartile = 75th quantile) but can be configured. Centering and scaling happen independently on each feature by computing the relevant statistics on the samples in the training set. Median and quantile range are then stored to be used on later data using the transform method. Note that NaN values are ignored in the computation of medians and ranges.
.. versionadded:: 3.0.0
Examples -------- >>> from pyspark.ml.linalg import Vectors >>> data = [(0, Vectors.dense([0.0, 0.0]),), ... (1, Vectors.dense([1.0, -1.0]),), ... (2, Vectors.dense([2.0, -2.0]),), ... (3, Vectors.dense([3.0, -3.0]),), ... (4, Vectors.dense([4.0, -4.0]),),] >>> df = spark.createDataFrame(data, ["id", "features"]) >>> scaler = RobustScaler() >>> scaler.setInputCol("features") RobustScaler... >>> scaler.setOutputCol("scaled") RobustScaler... >>> model = scaler.fit(df) >>> model.setOutputCol("output") RobustScalerModel... >>> model.median DenseVector([2.0, -2.0]) >>> model.range DenseVector([2.0, 2.0]) >>> model.transform(df).collect()[1].output DenseVector([0.5, -0.5]) >>> scalerPath = temp_path + "/robust-scaler" >>> scaler.save(scalerPath) >>> loadedScaler = RobustScaler.load(scalerPath) >>> loadedScaler.getWithCentering() == scaler.getWithCentering() True >>> loadedScaler.getWithScaling() == scaler.getWithScaling() True >>> modelPath = temp_path + "/robust-scaler-model" >>> model.save(modelPath) >>> loadedModel = RobustScalerModel.load(modelPath) >>> loadedModel.median == model.median True >>> loadedModel.range == model.range True >>> loadedModel.transform(df).take(1) == model.transform(df).take(1) True """
inputCol=None, outputCol=None, relativeError=0.001): """ __init__(self, \\*, lower=0.25, upper=0.75, withCentering=False, withScaling=True, \ inputCol=None, outputCol=None, relativeError=0.001) """
inputCol=None, outputCol=None, relativeError=0.001): """ setParams(self, \\*, lower=0.25, upper=0.75, withCentering=False, withScaling=True, \ inputCol=None, outputCol=None, relativeError=0.001) Sets params for this RobustScaler. """
def setLower(self, value): """ Sets the value of :py:attr:`lower`. """ return self._set(lower=value)
def setUpper(self, value): """ Sets the value of :py:attr:`upper`. """ return self._set(upper=value)
def setWithCentering(self, value): """ Sets the value of :py:attr:`withCentering`. """ return self._set(withCentering=value)
def setWithScaling(self, value): """ Sets the value of :py:attr:`withScaling`. """ return self._set(withScaling=value)
def setInputCol(self, value): """ Sets the value of :py:attr:`inputCol`. """
def setOutputCol(self, value): """ Sets the value of :py:attr:`outputCol`. """
def setRelativeError(self, value): """ Sets the value of :py:attr:`relativeError`. """ return self._set(relativeError=value)
""" Model fitted by :py:class:`RobustScaler`.
.. versionadded:: 3.0.0 """
def setInputCol(self, value): """ Sets the value of :py:attr:`inputCol`. """ return self._set(inputCol=value)
def setOutputCol(self, value): """ Sets the value of :py:attr:`outputCol`. """
def median(self): """ Median of the RobustScalerModel. """
def range(self): """ Quantile range of the RobustScalerModel. """
""" A regex based tokenizer that extracts tokens either by using the provided regex pattern (in Java dialect) to split the text (default) or repeatedly matching the regex (if gaps is false). Optional parameters also allow filtering tokens using a minimal length. It returns an array of strings that can be empty.
.. versionadded:: 1.4.0
Examples -------- >>> df = spark.createDataFrame([("A B c",)], ["text"]) >>> reTokenizer = RegexTokenizer() >>> reTokenizer.setInputCol("text") RegexTokenizer... >>> reTokenizer.setOutputCol("words") RegexTokenizer... >>> reTokenizer.transform(df).head() Row(text='A B c', words=['a', 'b', 'c']) >>> # Change a parameter. >>> reTokenizer.setParams(outputCol="tokens").transform(df).head() Row(text='A B c', tokens=['a', 'b', 'c']) >>> # Temporarily modify a parameter. >>> reTokenizer.transform(df, {reTokenizer.outputCol: "words"}).head() Row(text='A B c', words=['a', 'b', 'c']) >>> reTokenizer.transform(df).head() Row(text='A B c', tokens=['a', 'b', 'c']) >>> # Must use keyword arguments to specify params. >>> reTokenizer.setParams("text") Traceback (most recent call last): ... TypeError: Method setParams forces keyword arguments. >>> regexTokenizerPath = temp_path + "/regex-tokenizer" >>> reTokenizer.save(regexTokenizerPath) >>> loadedReTokenizer = RegexTokenizer.load(regexTokenizerPath) >>> loadedReTokenizer.getMinTokenLength() == reTokenizer.getMinTokenLength() True >>> loadedReTokenizer.getGaps() == reTokenizer.getGaps() True >>> loadedReTokenizer.transform(df).take(1) == reTokenizer.transform(df).take(1) True """
typeConverter=TypeConverters.toInt) "(False)") typeConverter=TypeConverters.toString) "lowercase before tokenizing", typeConverter=TypeConverters.toBoolean)
outputCol=None, toLowercase=True): """ __init__(self, \\*, minTokenLength=1, gaps=True, pattern="\\s+", inputCol=None, \ outputCol=None, toLowercase=True) """
outputCol=None, toLowercase=True): """ setParams(self, \\*, minTokenLength=1, gaps=True, pattern="\\s+", inputCol=None, \ outputCol=None, toLowercase=True) Sets params for this RegexTokenizer. """
def setMinTokenLength(self, value): """ Sets the value of :py:attr:`minTokenLength`. """ return self._set(minTokenLength=value)
def getMinTokenLength(self): """ Gets the value of minTokenLength or its default value. """
def setGaps(self, value): """ Sets the value of :py:attr:`gaps`. """ return self._set(gaps=value)
def getGaps(self): """ Gets the value of gaps or its default value. """
def setPattern(self, value): """ Sets the value of :py:attr:`pattern`. """ return self._set(pattern=value)
def getPattern(self): """ Gets the value of pattern or its default value. """ return self.getOrDefault(self.pattern)
def setToLowercase(self, value): """ Sets the value of :py:attr:`toLowercase`. """ return self._set(toLowercase=value)
def getToLowercase(self): """ Gets the value of toLowercase or its default value. """ return self.getOrDefault(self.toLowercase)
""" Sets the value of :py:attr:`inputCol`. """
""" Sets the value of :py:attr:`outputCol`. """
""" Implements the transforms which are defined by SQL statement. Currently we only support SQL syntax like `SELECT ... FROM __THIS__` where `__THIS__` represents the underlying table of the input dataset.
.. versionadded:: 1.6.0
Examples -------- >>> df = spark.createDataFrame([(0, 1.0, 3.0), (2, 2.0, 5.0)], ["id", "v1", "v2"]) >>> sqlTrans = SQLTransformer( ... statement="SELECT *, (v1 + v2) AS v3, (v1 * v2) AS v4 FROM __THIS__") >>> sqlTrans.transform(df).head() Row(id=0, v1=1.0, v2=3.0, v3=4.0, v4=3.0) >>> sqlTransformerPath = temp_path + "/sql-transformer" >>> sqlTrans.save(sqlTransformerPath) >>> loadedSqlTrans = SQLTransformer.load(sqlTransformerPath) >>> loadedSqlTrans.getStatement() == sqlTrans.getStatement() True >>> loadedSqlTrans.transform(df).take(1) == sqlTrans.transform(df).take(1) True """
typeConverter=TypeConverters.toString)
""" __init__(self, \\*, statement=None) """
""" setParams(self, \\*, statement=None) Sets params for this SQLTransformer. """
def setStatement(self, value): """ Sets the value of :py:attr:`statement`. """ return self._set(statement=value)
def getStatement(self): """ Gets the value of statement or its default value. """
""" Params for :py:class:`StandardScaler` and :py:class:`StandardScalerModel`.
.. versionadded:: 3.0.0 """
typeConverter=TypeConverters.toBoolean) typeConverter=TypeConverters.toBoolean)
def getWithMean(self): """ Gets the value of withMean or its default value. """
def getWithStd(self): """ Gets the value of withStd or its default value. """
""" Standardizes features by removing the mean and scaling to unit variance using column summary statistics on the samples in the training set.
The "unit std" is computed using the `corrected sample standard deviation \ <https://en.wikipedia.org/wiki/Standard_deviation#Corrected_sample_standard_deviation>`_, which is computed as the square root of the unbiased sample variance.
.. versionadded:: 1.4.0
Examples -------- >>> from pyspark.ml.linalg import Vectors >>> df = spark.createDataFrame([(Vectors.dense([0.0]),), (Vectors.dense([2.0]),)], ["a"]) >>> standardScaler = StandardScaler() >>> standardScaler.setInputCol("a") StandardScaler... >>> standardScaler.setOutputCol("scaled") StandardScaler... >>> model = standardScaler.fit(df) >>> model.getInputCol() 'a' >>> model.setOutputCol("output") StandardScalerModel... >>> model.mean DenseVector([1.0]) >>> model.std DenseVector([1.4142]) >>> model.transform(df).collect()[1].output DenseVector([1.4142]) >>> standardScalerPath = temp_path + "/standard-scaler" >>> standardScaler.save(standardScalerPath) >>> loadedStandardScaler = StandardScaler.load(standardScalerPath) >>> loadedStandardScaler.getWithMean() == standardScaler.getWithMean() True >>> loadedStandardScaler.getWithStd() == standardScaler.getWithStd() True >>> modelPath = temp_path + "/standard-scaler-model" >>> model.save(modelPath) >>> loadedModel = StandardScalerModel.load(modelPath) >>> loadedModel.std == model.std True >>> loadedModel.mean == model.mean True >>> loadedModel.transform(df).take(1) == model.transform(df).take(1) True """
""" __init__(self, \\*, withMean=False, withStd=True, inputCol=None, outputCol=None) """
""" setParams(self, \\*, withMean=False, withStd=True, inputCol=None, outputCol=None) Sets params for this StandardScaler. """
def setWithMean(self, value): """ Sets the value of :py:attr:`withMean`. """ return self._set(withMean=value)
def setWithStd(self, value): """ Sets the value of :py:attr:`withStd`. """ return self._set(withStd=value)
""" Sets the value of :py:attr:`inputCol`. """
""" Sets the value of :py:attr:`outputCol`. """
""" Model fitted by :py:class:`StandardScaler`.
.. versionadded:: 1.4.0 """
""" Sets the value of :py:attr:`inputCol`. """ return self._set(inputCol=value)
""" Sets the value of :py:attr:`outputCol`. """
def std(self): """ Standard deviation of the StandardScalerModel. """
def mean(self): """ Mean of the StandardScalerModel. """
HasInputCols, HasOutputCols): """ Params for :py:class:`StringIndexer` and :py:class:`StringIndexerModel`. """
"How to order labels of string column. The first label after " + "ordering is assigned an index of 0. Supported options: " + "frequencyDesc, frequencyAsc, alphabetDesc, alphabetAsc. " + "Default is frequencyDesc. In case of equal frequency when " + "under frequencyDesc/Asc, the strings are further sorted " + "alphabetically", typeConverter=TypeConverters.toString)
"or NULL values) in features and label column of string type. " + "Options are 'skip' (filter out rows with invalid data), " + "error (throw an error), or 'keep' (put invalid data " + "in a special additional bucket, at index numLabels).", typeConverter=TypeConverters.toString)
def getStringOrderType(self): """ Gets the value of :py:attr:`stringOrderType` or its default value 'frequencyDesc'. """
""" A label indexer that maps a string column of labels to an ML column of label indices. If the input column is numeric, we cast it to string and index the string values. The indices are in [0, numLabels). By default, this is ordered by label frequencies so the most frequent label gets index 0. The ordering behavior is controlled by setting :py:attr:`stringOrderType`. Its default value is 'frequencyDesc'.
.. versionadded:: 1.4.0
Examples -------- >>> stringIndexer = StringIndexer(inputCol="label", outputCol="indexed", ... stringOrderType="frequencyDesc") >>> stringIndexer.setHandleInvalid("error") StringIndexer... >>> model = stringIndexer.fit(stringIndDf) >>> model.setHandleInvalid("error") StringIndexerModel... >>> td = model.transform(stringIndDf) >>> sorted(set([(i[0], i[1]) for i in td.select(td.id, td.indexed).collect()]), ... key=lambda x: x[0]) [(0, 0.0), (1, 2.0), (2, 1.0), (3, 0.0), (4, 0.0), (5, 1.0)] >>> inverter = IndexToString(inputCol="indexed", outputCol="label2", labels=model.labels) >>> itd = inverter.transform(td) >>> sorted(set([(i[0], str(i[1])) for i in itd.select(itd.id, itd.label2).collect()]), ... key=lambda x: x[0]) [(0, 'a'), (1, 'b'), (2, 'c'), (3, 'a'), (4, 'a'), (5, 'c')] >>> stringIndexerPath = temp_path + "/string-indexer" >>> stringIndexer.save(stringIndexerPath) >>> loadedIndexer = StringIndexer.load(stringIndexerPath) >>> loadedIndexer.getHandleInvalid() == stringIndexer.getHandleInvalid() True >>> modelPath = temp_path + "/string-indexer-model" >>> model.save(modelPath) >>> loadedModel = StringIndexerModel.load(modelPath) >>> loadedModel.labels == model.labels True >>> indexToStringPath = temp_path + "/index-to-string" >>> inverter.save(indexToStringPath) >>> loadedInverter = IndexToString.load(indexToStringPath) >>> loadedInverter.getLabels() == inverter.getLabels() True >>> loadedModel.transform(stringIndDf).take(1) == model.transform(stringIndDf).take(1) True >>> stringIndexer.getStringOrderType() 'frequencyDesc' >>> stringIndexer = StringIndexer(inputCol="label", outputCol="indexed", handleInvalid="error", ... stringOrderType="alphabetDesc") >>> model = stringIndexer.fit(stringIndDf) >>> td = model.transform(stringIndDf) >>> sorted(set([(i[0], i[1]) for i in td.select(td.id, td.indexed).collect()]), ... key=lambda x: x[0]) [(0, 2.0), (1, 1.0), (2, 0.0), (3, 2.0), (4, 2.0), (5, 0.0)] >>> fromlabelsModel = StringIndexerModel.from_labels(["a", "b", "c"], ... inputCol="label", outputCol="indexed", handleInvalid="error") >>> result = fromlabelsModel.transform(stringIndDf) >>> sorted(set([(i[0], i[1]) for i in result.select(result.id, result.indexed).collect()]), ... key=lambda x: x[0]) [(0, 0.0), (1, 1.0), (2, 2.0), (3, 0.0), (4, 0.0), (5, 2.0)] >>> testData = sc.parallelize([Row(id=0, label1="a", label2="e"), ... Row(id=1, label1="b", label2="f"), ... Row(id=2, label1="c", label2="e"), ... Row(id=3, label1="a", label2="f"), ... Row(id=4, label1="a", label2="f"), ... Row(id=5, label1="c", label2="f")], 3) >>> multiRowDf = spark.createDataFrame(testData) >>> inputs = ["label1", "label2"] >>> outputs = ["index1", "index2"] >>> stringIndexer = StringIndexer(inputCols=inputs, outputCols=outputs) >>> model = stringIndexer.fit(multiRowDf) >>> result = model.transform(multiRowDf) >>> sorted(set([(i[0], i[1], i[2]) for i in result.select(result.id, result.index1, ... result.index2).collect()]), key=lambda x: x[0]) [(0, 0.0, 1.0), (1, 2.0, 0.0), (2, 1.0, 1.0), (3, 0.0, 0.0), (4, 0.0, 0.0), (5, 1.0, 0.0)] >>> fromlabelsModel = StringIndexerModel.from_arrays_of_labels([["a", "b", "c"], ["e", "f"]], ... inputCols=inputs, outputCols=outputs) >>> result = fromlabelsModel.transform(multiRowDf) >>> sorted(set([(i[0], i[1], i[2]) for i in result.select(result.id, result.index1, ... result.index2).collect()]), key=lambda x: x[0]) [(0, 0.0, 0.0), (1, 1.0, 1.0), (2, 2.0, 0.0), (3, 0.0, 1.0), (4, 0.0, 1.0), (5, 2.0, 1.0)] """
handleInvalid="error", stringOrderType="frequencyDesc"): """ __init__(self, \\*, inputCol=None, outputCol=None, inputCols=None, outputCols=None, \ handleInvalid="error", stringOrderType="frequencyDesc") """
handleInvalid="error", stringOrderType="frequencyDesc"): """ setParams(self, \\*, inputCol=None, outputCol=None, inputCols=None, outputCols=None, \ handleInvalid="error", stringOrderType="frequencyDesc") Sets params for this StringIndexer. """
def setStringOrderType(self, value): """ Sets the value of :py:attr:`stringOrderType`. """ return self._set(stringOrderType=value)
""" Sets the value of :py:attr:`inputCol`. """ return self._set(inputCol=value)
def setInputCols(self, value): """ Sets the value of :py:attr:`inputCols`. """ return self._set(inputCols=value)
""" Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
def setOutputCols(self, value): """ Sets the value of :py:attr:`outputCols`. """ return self._set(outputCols=value)
""" Sets the value of :py:attr:`handleInvalid`. """
""" Model fitted by :py:class:`StringIndexer`.
.. versionadded:: 1.4.0 """
""" Sets the value of :py:attr:`inputCol`. """
def setInputCols(self, value): """ Sets the value of :py:attr:`inputCols`. """
""" Sets the value of :py:attr:`outputCol`. """
def setOutputCols(self, value): """ Sets the value of :py:attr:`outputCols`. """
def setHandleInvalid(self, value): """ Sets the value of :py:attr:`handleInvalid`. """
""" Construct the model directly from an array of label strings, requires an active SparkContext. """ "org.apache.spark.ml.feature.StringIndexerModel", jlabels)
handleInvalid=None): """ Construct the model directly from an array of array of label strings, requires an active SparkContext. """ "org.apache.spark.ml.feature.StringIndexerModel", jlabels) model.setHandleInvalid(handleInvalid)
def labels(self): """ Ordered list of labels, corresponding to indices to be assigned.
.. deprecated:: 3.1.0 It will be removed in future versions. Use `labelsArray` method instead. """
def labelsArray(self): """ Array of ordered list of labels, corresponding to indices to be assigned for each input column. """
""" A :py:class:`pyspark.ml.base.Transformer` that maps a column of indices back to a new column of corresponding string values. The index-string mapping is either from the ML attributes of the input column, or from user-supplied labels (which take precedence over ML attributes).
.. versionadded:: 1.6.0
See Also -------- StringIndexer : for converting categorical values into category indices """
"Optional array of labels specifying index-string mapping." + " If not provided or if empty, then metadata from inputCol is used instead.", typeConverter=TypeConverters.toListString)
""" __init__(self, \\*, inputCol=None, outputCol=None, labels=None) """ self.uid)
""" setParams(self, \\*, inputCol=None, outputCol=None, labels=None) Sets params for this IndexToString. """
def setLabels(self, value): """ Sets the value of :py:attr:`labels`. """ return self._set(labels=value)
def getLabels(self): """ Gets the value of :py:attr:`labels` or its default value. """
""" Sets the value of :py:attr:`inputCol`. """ return self._set(inputCol=value)
""" Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
JavaMLReadable, JavaMLWritable): """ A feature transformer that filters out stop words from input. Since 3.0.0, :py:class:`StopWordsRemover` can filter out multiple columns at once by setting the :py:attr:`inputCols` parameter. Note that when both the :py:attr:`inputCol` and :py:attr:`inputCols` parameters are set, an Exception will be thrown.
.. versionadded:: 1.6.0
Notes ----- null values from input array are preserved unless adding null to stopWords explicitly.
Examples -------- >>> df = spark.createDataFrame([(["a", "b", "c"],)], ["text"]) >>> remover = StopWordsRemover(stopWords=["b"]) >>> remover.setInputCol("text") StopWordsRemover... >>> remover.setOutputCol("words") StopWordsRemover... >>> remover.transform(df).head().words == ['a', 'c'] True >>> stopWordsRemoverPath = temp_path + "/stopwords-remover" >>> remover.save(stopWordsRemoverPath) >>> loadedRemover = StopWordsRemover.load(stopWordsRemoverPath) >>> loadedRemover.getStopWords() == remover.getStopWords() True >>> loadedRemover.getCaseSensitive() == remover.getCaseSensitive() True >>> loadedRemover.transform(df).take(1) == remover.transform(df).take(1) True >>> df2 = spark.createDataFrame([(["a", "b", "c"], ["a", "b"])], ["text1", "text2"]) >>> remover2 = StopWordsRemover(stopWords=["b"]) >>> remover2.setInputCols(["text1", "text2"]).setOutputCols(["words1", "words2"]) StopWordsRemover... >>> remover2.transform(df2).show() +---------+------+------+------+ | text1| text2|words1|words2| +---------+------+------+------+ |[a, b, c]|[a, b]|[a, c]| [a]| +---------+------+------+------+ ... """
typeConverter=TypeConverters.toListString) "comparison over the stop words", typeConverter=TypeConverters.toBoolean) "is true", typeConverter=TypeConverters.toString)
locale=None, inputCols=None, outputCols=None): """ __init__(self, \\*, inputCol=None, outputCol=None, stopWords=None, caseSensitive=false, \ locale=None, inputCols=None, outputCols=None) """ self.uid) caseSensitive=False, locale=self._java_obj.getLocale())
locale=None, inputCols=None, outputCols=None): """ setParams(self, \\*, inputCol=None, outputCol=None, stopWords=None, caseSensitive=false, \ locale=None, inputCols=None, outputCols=None) Sets params for this StopWordRemover. """
def setStopWords(self, value): """ Sets the value of :py:attr:`stopWords`. """
def getStopWords(self): """ Gets the value of :py:attr:`stopWords` or its default value. """
def setCaseSensitive(self, value): """ Sets the value of :py:attr:`caseSensitive`. """ return self._set(caseSensitive=value)
def getCaseSensitive(self): """ Gets the value of :py:attr:`caseSensitive` or its default value. """
def setLocale(self, value): """ Sets the value of :py:attr:`locale`. """
def getLocale(self): """ Gets the value of :py:attr:`locale`. """ return self.getOrDefault(self.locale)
""" Sets the value of :py:attr:`inputCol`. """
""" Sets the value of :py:attr:`outputCol`. """
def setInputCols(self, value): """ Sets the value of :py:attr:`inputCols`. """
def setOutputCols(self, value): """ Sets the value of :py:attr:`outputCols`. """
def loadDefaultStopWords(language): """ Loads the default stop words for the given language. Supported languages: danish, dutch, english, finnish, french, german, hungarian, italian, norwegian, portuguese, russian, spanish, swedish, turkish """
""" A tokenizer that converts the input string to lowercase and then splits it by white spaces.
.. versionadded:: 1.3.0
Examples -------- >>> df = spark.createDataFrame([("a b c",)], ["text"]) >>> tokenizer = Tokenizer(outputCol="words") >>> tokenizer.setInputCol("text") Tokenizer... >>> tokenizer.transform(df).head() Row(text='a b c', words=['a', 'b', 'c']) >>> # Change a parameter. >>> tokenizer.setParams(outputCol="tokens").transform(df).head() Row(text='a b c', tokens=['a', 'b', 'c']) >>> # Temporarily modify a parameter. >>> tokenizer.transform(df, {tokenizer.outputCol: "words"}).head() Row(text='a b c', words=['a', 'b', 'c']) >>> tokenizer.transform(df).head() Row(text='a b c', tokens=['a', 'b', 'c']) >>> # Must use keyword arguments to specify params. >>> tokenizer.setParams("text") Traceback (most recent call last): ... TypeError: Method setParams forces keyword arguments. >>> tokenizerPath = temp_path + "/tokenizer" >>> tokenizer.save(tokenizerPath) >>> loadedTokenizer = Tokenizer.load(tokenizerPath) >>> loadedTokenizer.transform(df).head().tokens == tokenizer.transform(df).head().tokens True """
""" __init__(self, \\*, inputCol=None, outputCol=None) """
""" setParams(self, \\*, inputCol=None, outputCol=None) Sets params for this Tokenizer. """
""" Sets the value of :py:attr:`inputCol`. """
""" Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
JavaMLWritable): """ A feature transformer that merges multiple columns into a vector column.
.. versionadded:: 1.4.0
Examples -------- >>> df = spark.createDataFrame([(1, 0, 3)], ["a", "b", "c"]) >>> vecAssembler = VectorAssembler(outputCol="features") >>> vecAssembler.setInputCols(["a", "b", "c"]) VectorAssembler... >>> vecAssembler.transform(df).head().features DenseVector([1.0, 0.0, 3.0]) >>> vecAssembler.setParams(outputCol="freqs").transform(df).head().freqs DenseVector([1.0, 0.0, 3.0]) >>> params = {vecAssembler.inputCols: ["b", "a"], vecAssembler.outputCol: "vector"} >>> vecAssembler.transform(df, params).head().vector DenseVector([0.0, 1.0]) >>> vectorAssemblerPath = temp_path + "/vector-assembler" >>> vecAssembler.save(vectorAssemblerPath) >>> loadedAssembler = VectorAssembler.load(vectorAssemblerPath) >>> loadedAssembler.transform(df).head().freqs == vecAssembler.transform(df).head().freqs True >>> dfWithNullsAndNaNs = spark.createDataFrame( ... [(1.0, 2.0, None), (3.0, float("nan"), 4.0), (5.0, 6.0, 7.0)], ["a", "b", "c"]) >>> vecAssembler2 = VectorAssembler(inputCols=["a", "b", "c"], outputCol="features", ... handleInvalid="keep") >>> vecAssembler2.transform(dfWithNullsAndNaNs).show() +---+---+----+-------------+ | a| b| c| features| +---+---+----+-------------+ |1.0|2.0|null|[1.0,2.0,NaN]| |3.0|NaN| 4.0|[3.0,NaN,4.0]| |5.0|6.0| 7.0|[5.0,6.0,7.0]| +---+---+----+-------------+ ... >>> vecAssembler2.setParams(handleInvalid="skip").transform(dfWithNullsAndNaNs).show() +---+---+---+-------------+ | a| b| c| features| +---+---+---+-------------+ |5.0|6.0|7.0|[5.0,6.0,7.0]| +---+---+---+-------------+ ... """
"and NaN values). Options are 'skip' (filter out rows with invalid " + "data), 'error' (throw an error), or 'keep' (return relevant number " + "of NaN in the output). Column lengths are taken from the size of ML " + "Attribute Group, which can be set using `VectorSizeHint` in a " + "pipeline before `VectorAssembler`. Column lengths can also be " + "inferred from first rows of the data since it is safe to do so but " + "only in case of 'error' or 'skip').", typeConverter=TypeConverters.toString)
""" __init__(self, \\*, inputCols=None, outputCol=None, handleInvalid="error") """
""" setParams(self, \\*, inputCols=None, outputCol=None, handleInvalid="error") Sets params for this VectorAssembler. """
""" Sets the value of :py:attr:`inputCols`. """
""" Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
""" Sets the value of :py:attr:`handleInvalid`. """ return self._set(handleInvalid=value)
""" Params for :py:class:`VectorIndexer` and :py:class:`VectorIndexerModel`.
.. versionadded:: 3.0.0 """
"Threshold for the number of values a categorical feature can take " + "(>= 2). If a feature is found to have > maxCategories values, then " + "it is declared continuous.", typeConverter=TypeConverters.toInt)
"(unseen labels or NULL values). Options are 'skip' (filter out " + "rows with invalid data), 'error' (throw an error), or 'keep' (put " + "invalid data in a special additional bucket, at index of the number " + "of categories of the feature).", typeConverter=TypeConverters.toString)
def getMaxCategories(self): """ Gets the value of maxCategories or its default value. """
""" Class for indexing categorical feature columns in a dataset of `Vector`.
This has 2 usage modes: - Automatically identify categorical features (default behavior) - This helps process a dataset of unknown vectors into a dataset with some continuous features and some categorical features. The choice between continuous and categorical is based upon a maxCategories parameter. - Set maxCategories to the maximum number of categorical any categorical feature should have. - E.g.: Feature 0 has unique values {-1.0, 0.0}, and feature 1 values {1.0, 3.0, 5.0}. If maxCategories = 2, then feature 0 will be declared categorical and use indices {0, 1}, and feature 1 will be declared continuous. - Index all features, if all features are categorical - If maxCategories is set to be very large, then this will build an index of unique values for all features. - Warning: This can cause problems if features are continuous since this will collect ALL unique values to the driver. - E.g.: Feature 0 has unique values {-1.0, 0.0}, and feature 1 values {1.0, 3.0, 5.0}. If maxCategories >= 3, then both features will be declared categorical.
This returns a model which can transform categorical features to use 0-based indices.
Index stability: - This is not guaranteed to choose the same category index across multiple runs. - If a categorical feature includes value 0, then this is guaranteed to map value 0 to index 0. This maintains vector sparsity. - More stability may be added in the future.
TODO: Future extensions: The following functionality is planned for the future: - Preserve metadata in transform; if a feature's metadata is already present, do not recompute. - Specify certain features to not index, either via a parameter or via existing metadata. - Add warning if a categorical feature has only 1 category.
.. versionadded:: 1.4.0
Examples -------- >>> from pyspark.ml.linalg import Vectors >>> df = spark.createDataFrame([(Vectors.dense([-1.0, 0.0]),), ... (Vectors.dense([0.0, 1.0]),), (Vectors.dense([0.0, 2.0]),)], ["a"]) >>> indexer = VectorIndexer(maxCategories=2, inputCol="a") >>> indexer.setOutputCol("indexed") VectorIndexer... >>> model = indexer.fit(df) >>> indexer.getHandleInvalid() 'error' >>> model.setOutputCol("output") VectorIndexerModel... >>> model.transform(df).head().output DenseVector([1.0, 0.0]) >>> model.numFeatures 2 >>> model.categoryMaps {0: {0.0: 0, -1.0: 1}} >>> indexer.setParams(outputCol="test").fit(df).transform(df).collect()[1].test DenseVector([0.0, 1.0]) >>> params = {indexer.maxCategories: 3, indexer.outputCol: "vector"} >>> model2 = indexer.fit(df, params) >>> model2.transform(df).head().vector DenseVector([1.0, 0.0]) >>> vectorIndexerPath = temp_path + "/vector-indexer" >>> indexer.save(vectorIndexerPath) >>> loadedIndexer = VectorIndexer.load(vectorIndexerPath) >>> loadedIndexer.getMaxCategories() == indexer.getMaxCategories() True >>> modelPath = temp_path + "/vector-indexer-model" >>> model.save(modelPath) >>> loadedModel = VectorIndexerModel.load(modelPath) >>> loadedModel.numFeatures == model.numFeatures True >>> loadedModel.categoryMaps == model.categoryMaps True >>> loadedModel.transform(df).take(1) == model.transform(df).take(1) True >>> dfWithInvalid = spark.createDataFrame([(Vectors.dense([3.0, 1.0]),)], ["a"]) >>> indexer.getHandleInvalid() 'error' >>> model3 = indexer.setHandleInvalid("skip").fit(df) >>> model3.transform(dfWithInvalid).count() 0 >>> model4 = indexer.setParams(handleInvalid="keep", outputCol="indexed").fit(df) >>> model4.transform(dfWithInvalid).head().indexed DenseVector([2.0, 1.0]) """
""" __init__(self, \\*, maxCategories=20, inputCol=None, outputCol=None, handleInvalid="error") """
""" setParams(self, \\*, maxCategories=20, inputCol=None, outputCol=None, handleInvalid="error") Sets params for this VectorIndexer. """
def setMaxCategories(self, value): """ Sets the value of :py:attr:`maxCategories`. """ return self._set(maxCategories=value)
""" Sets the value of :py:attr:`inputCol`. """ return self._set(inputCol=value)
""" Sets the value of :py:attr:`outputCol`. """
""" Sets the value of :py:attr:`handleInvalid`. """
""" Model fitted by :py:class:`VectorIndexer`.
Transform categorical features to use 0-based indices instead of their original values. - Categorical features are mapped to indices. - Continuous features (columns) are left unchanged.
This also appends metadata to the output column, marking features as Numeric (continuous), Nominal (categorical), or Binary (either continuous or categorical). Non-ML metadata is not carried over from the input to the output column.
This maintains vector sparsity.
.. versionadded:: 1.4.0 """
def setInputCol(self, value): """ Sets the value of :py:attr:`inputCol`. """ return self._set(inputCol=value)
def setOutputCol(self, value): """ Sets the value of :py:attr:`outputCol`. """
def numFeatures(self): """ Number of features, i.e., length of Vectors which this transforms. """
def categoryMaps(self): """ Feature value index. Keys are categorical feature indices (column indices). Values are maps from original features values to 0-based category indices. If a feature is not in this map, it is treated as continuous. """
""" This class takes a feature vector and outputs a new feature vector with a subarray of the original features.
The subset of features can be specified with either indices (`setIndices()`) or names (`setNames()`). At least one feature must be selected. Duplicate features are not allowed, so there can be no overlap between selected indices and names.
The output vector will order features with the selected indices first (in the order given), followed by the selected names (in the order given).
.. versionadded:: 1.6.0
Examples -------- >>> from pyspark.ml.linalg import Vectors >>> df = spark.createDataFrame([ ... (Vectors.dense([-2.0, 2.3, 0.0, 0.0, 1.0]),), ... (Vectors.dense([0.0, 0.0, 0.0, 0.0, 0.0]),), ... (Vectors.dense([0.6, -1.1, -3.0, 4.5, 3.3]),)], ["features"]) >>> vs = VectorSlicer(outputCol="sliced", indices=[1, 4]) >>> vs.setInputCol("features") VectorSlicer... >>> vs.transform(df).head().sliced DenseVector([2.3, 1.0]) >>> vectorSlicerPath = temp_path + "/vector-slicer" >>> vs.save(vectorSlicerPath) >>> loadedVs = VectorSlicer.load(vectorSlicerPath) >>> loadedVs.getIndices() == vs.getIndices() True >>> loadedVs.getNames() == vs.getNames() True >>> loadedVs.transform(df).take(1) == vs.transform(df).take(1) True """
"a vector column. There can be no overlap with names.", typeConverter=TypeConverters.toListInt) "a vector column. These names must be specified by ML " + "org.apache.spark.ml.attribute.Attribute. There can be no overlap with " + "indices.", typeConverter=TypeConverters.toListString)
""" __init__(self, \\*, inputCol=None, outputCol=None, indices=None, names=None) """
""" setParams(self, \\*, inputCol=None, outputCol=None, indices=None, names=None): Sets params for this VectorSlicer. """
def setIndices(self, value): """ Sets the value of :py:attr:`indices`. """ return self._set(indices=value)
def getIndices(self): """ Gets the value of indices or its default value. """
def setNames(self, value): """ Sets the value of :py:attr:`names`. """ return self._set(names=value)
def getNames(self): """ Gets the value of names or its default value. """
""" Sets the value of :py:attr:`inputCol`. """
""" Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
""" Params for :py:class:`Word2Vec` and :py:class:`Word2VecModel`.
.. versionadded:: 3.0.0 """
"the dimension of codes after transforming from words", typeConverter=TypeConverters.toInt) "number of partitions for sentences of words", typeConverter=TypeConverters.toInt) "the minimum number of times a token must appear to be included in the " + "word2vec model's vocabulary", typeConverter=TypeConverters.toInt) "the window size (context words from [-window, window]). Default value is 5", typeConverter=TypeConverters.toInt) "Maximum length (in words) of each sentence in the input data. " + "Any sentence longer than this threshold will " + "be divided into chunks up to the size.", typeConverter=TypeConverters.toInt)
windowSize=5, maxSentenceLength=1000)
def getVectorSize(self): """ Gets the value of vectorSize or its default value. """
def getNumPartitions(self): """ Gets the value of numPartitions or its default value. """
def getMinCount(self): """ Gets the value of minCount or its default value. """
def getWindowSize(self): """ Gets the value of windowSize or its default value. """
def getMaxSentenceLength(self): """ Gets the value of maxSentenceLength or its default value. """ return self.getOrDefault(self.maxSentenceLength)
""" Word2Vec trains a model of `Map(String, Vector)`, i.e. transforms a word into a code for further natural language processing or machine learning process.
.. versionadded:: 1.4.0
Examples -------- >>> sent = ("a b " * 100 + "a c " * 10).split(" ") >>> doc = spark.createDataFrame([(sent,), (sent,)], ["sentence"]) >>> word2Vec = Word2Vec(vectorSize=5, seed=42, inputCol="sentence", outputCol="model") >>> word2Vec.setMaxIter(10) Word2Vec... >>> word2Vec.getMaxIter() 10 >>> word2Vec.clear(word2Vec.maxIter) >>> model = word2Vec.fit(doc) >>> model.getMinCount() 5 >>> model.setInputCol("sentence") Word2VecModel... >>> model.getVectors().show() +----+--------------------+ |word| vector| +----+--------------------+ | a|[0.0951... | b|[-1.202... | c|[0.3015... +----+--------------------+ ... >>> model.findSynonymsArray("a", 2) [('b', 0.015859...), ('c', -0.568079...)] >>> from pyspark.sql.functions import format_number as fmt >>> model.findSynonyms("a", 2).select("word", fmt("similarity", 5).alias("similarity")).show() +----+----------+ |word|similarity| +----+----------+ | b| 0.01586| | c| -0.56808| +----+----------+ ... >>> model.transform(doc).head().model DenseVector([-0.4833, 0.1855, -0.273, -0.0509, -0.4769]) >>> word2vecPath = temp_path + "/word2vec" >>> word2Vec.save(word2vecPath) >>> loadedWord2Vec = Word2Vec.load(word2vecPath) >>> loadedWord2Vec.getVectorSize() == word2Vec.getVectorSize() True >>> loadedWord2Vec.getNumPartitions() == word2Vec.getNumPartitions() True >>> loadedWord2Vec.getMinCount() == word2Vec.getMinCount() True >>> modelPath = temp_path + "/word2vec-model" >>> model.save(modelPath) >>> loadedModel = Word2VecModel.load(modelPath) >>> loadedModel.getVectors().first().word == model.getVectors().first().word True >>> loadedModel.getVectors().first().vector == model.getVectors().first().vector True >>> loadedModel.transform(doc).take(1) == model.transform(doc).take(1) True """
maxIter=1, seed=None, inputCol=None, outputCol=None, windowSize=5, maxSentenceLength=1000): """ __init__(self, \\*, vectorSize=100, minCount=5, numPartitions=1, stepSize=0.025, \ maxIter=1, seed=None, inputCol=None, outputCol=None, windowSize=5, \ maxSentenceLength=1000) """
maxIter=1, seed=None, inputCol=None, outputCol=None, windowSize=5, maxSentenceLength=1000): """ setParams(self, \\*, minCount=5, numPartitions=1, stepSize=0.025, maxIter=1, \ seed=None, inputCol=None, outputCol=None, windowSize=5, \ maxSentenceLength=1000) Sets params for this Word2Vec. """
def setVectorSize(self, value): """ Sets the value of :py:attr:`vectorSize`. """ return self._set(vectorSize=value)
def setNumPartitions(self, value): """ Sets the value of :py:attr:`numPartitions`. """ return self._set(numPartitions=value)
def setMinCount(self, value): """ Sets the value of :py:attr:`minCount`. """ return self._set(minCount=value)
def setWindowSize(self, value): """ Sets the value of :py:attr:`windowSize`. """
def setMaxSentenceLength(self, value): """ Sets the value of :py:attr:`maxSentenceLength`. """ return self._set(maxSentenceLength=value)
""" Sets the value of :py:attr:`maxIter`. """
""" Sets the value of :py:attr:`inputCol`. """ return self._set(inputCol=value)
""" Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
""" Sets the value of :py:attr:`seed`. """ return self._set(seed=value)
def setStepSize(self, value): """ Sets the value of :py:attr:`stepSize`. """ return self._set(stepSize=value)
""" Model fitted by :py:class:`Word2Vec`.
.. versionadded:: 1.4.0 """
def getVectors(self): """ Returns the vector representation of the words as a dataframe with two fields, word and vector. """
""" Sets the value of :py:attr:`inputCol`. """
""" Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
def findSynonyms(self, word, num): """ Find "num" number of words closest in similarity to "word". word can be a string or vector representation. Returns a dataframe with two fields word and similarity (which gives the cosine similarity). """ word = _convert_to_vector(word)
def findSynonymsArray(self, word, num): """ Find "num" number of words closest in similarity to "word". word can be a string or vector representation. Returns an array with two fields word and similarity (which gives the cosine similarity). """ word = _convert_to_vector(word)
""" Params for :py:class:`PCA` and :py:class:`PCAModel`.
.. versionadded:: 3.0.0 """
typeConverter=TypeConverters.toInt)
def getK(self): """ Gets the value of k or its default value. """
""" PCA trains a model to project vectors to a lower dimensional space of the top :py:attr:`k` principal components.
.. versionadded:: 1.5.0
Examples -------- >>> from pyspark.ml.linalg import Vectors >>> data = [(Vectors.sparse(5, [(1, 1.0), (3, 7.0)]),), ... (Vectors.dense([2.0, 0.0, 3.0, 4.0, 5.0]),), ... (Vectors.dense([4.0, 0.0, 0.0, 6.0, 7.0]),)] >>> df = spark.createDataFrame(data,["features"]) >>> pca = PCA(k=2, inputCol="features") >>> pca.setOutputCol("pca_features") PCA... >>> model = pca.fit(df) >>> model.getK() 2 >>> model.setOutputCol("output") PCAModel... >>> model.transform(df).collect()[0].output DenseVector([1.648..., -4.013...]) >>> model.explainedVariance DenseVector([0.794..., 0.205...]) >>> pcaPath = temp_path + "/pca" >>> pca.save(pcaPath) >>> loadedPca = PCA.load(pcaPath) >>> loadedPca.getK() == pca.getK() True >>> modelPath = temp_path + "/pca-model" >>> model.save(modelPath) >>> loadedModel = PCAModel.load(modelPath) >>> loadedModel.pc == model.pc True >>> loadedModel.explainedVariance == model.explainedVariance True >>> loadedModel.transform(df).take(1) == model.transform(df).take(1) True """
""" __init__(self, \\*, k=None, inputCol=None, outputCol=None) """
""" setParams(self, \\*, k=None, inputCol=None, outputCol=None) Set params for this PCA. """
def setK(self, value): """ Sets the value of :py:attr:`k`. """ return self._set(k=value)
""" Sets the value of :py:attr:`inputCol`. """ return self._set(inputCol=value)
""" Sets the value of :py:attr:`outputCol`. """
""" Model fitted by :py:class:`PCA`. Transforms vectors to a lower dimensional space.
.. versionadded:: 1.5.0 """
def setInputCol(self, value): """ Sets the value of :py:attr:`inputCol`. """ return self._set(inputCol=value)
def setOutputCol(self, value): """ Sets the value of :py:attr:`outputCol`. """
def pc(self): """ Returns a principal components Matrix. Each column is one principal component. """
def explainedVariance(self): """ Returns a vector of proportions of variance explained by each principal component. """
""" Params for :py:class:`RFormula` and :py:class:`RFormula`.
.. versionadded:: 3.0.0 """
typeConverter=TypeConverters.toString)
"Force to index label whether it is numeric or string", typeConverter=TypeConverters.toBoolean)
"How to order categories of a string feature column used by " + "StringIndexer. The last category after ordering is dropped " + "when encoding strings. Supported options: frequencyDesc, " + "frequencyAsc, alphabetDesc, alphabetAsc. The default value " + "is frequencyDesc. When the ordering is set to alphabetDesc, " + "RFormula drops the same category as R when encoding strings.", typeConverter=TypeConverters.toString)
"Options are 'skip' (filter out rows with invalid values), " + "'error' (throw an error), or 'keep' (put invalid data in a special " + "additional bucket, at index numLabels).", typeConverter=TypeConverters.toString)
handleInvalid="error")
def getFormula(self): """ Gets the value of :py:attr:`formula`. """
def getForceIndexLabel(self): """ Gets the value of :py:attr:`forceIndexLabel`. """ return self.getOrDefault(self.forceIndexLabel)
def getStringIndexerOrderType(self): """ Gets the value of :py:attr:`stringIndexerOrderType` or its default value 'frequencyDesc'. """
""" Implements the transforms required for fitting a dataset against an R model formula. Currently we support a limited subset of the R operators, including '~', '.', ':', '+', '-', '*', and '^'.
.. versionadded:: 1.5.0
Notes ----- Also see the `R formula docs <http://stat.ethz.ch/R-manual/R-patched/library/stats/html/formula.html>`_.
Examples -------- >>> df = spark.createDataFrame([ ... (1.0, 1.0, "a"), ... (0.0, 2.0, "b"), ... (0.0, 0.0, "a") ... ], ["y", "x", "s"]) >>> rf = RFormula(formula="y ~ x + s") >>> model = rf.fit(df) >>> model.getLabelCol() 'label' >>> model.transform(df).show() +---+---+---+---------+-----+ | y| x| s| features|label| +---+---+---+---------+-----+ |1.0|1.0| a|[1.0,1.0]| 1.0| |0.0|2.0| b|[2.0,0.0]| 0.0| |0.0|0.0| a|[0.0,1.0]| 0.0| +---+---+---+---------+-----+ ... >>> rf.fit(df, {rf.formula: "y ~ . - s"}).transform(df).show() +---+---+---+--------+-----+ | y| x| s|features|label| +---+---+---+--------+-----+ |1.0|1.0| a| [1.0]| 1.0| |0.0|2.0| b| [2.0]| 0.0| |0.0|0.0| a| [0.0]| 0.0| +---+---+---+--------+-----+ ... >>> rFormulaPath = temp_path + "/rFormula" >>> rf.save(rFormulaPath) >>> loadedRF = RFormula.load(rFormulaPath) >>> loadedRF.getFormula() == rf.getFormula() True >>> loadedRF.getFeaturesCol() == rf.getFeaturesCol() True >>> loadedRF.getLabelCol() == rf.getLabelCol() True >>> loadedRF.getHandleInvalid() == rf.getHandleInvalid() True >>> str(loadedRF) 'RFormula(y ~ x + s) (uid=...)' >>> modelPath = temp_path + "/rFormulaModel" >>> model.save(modelPath) >>> loadedModel = RFormulaModel.load(modelPath) >>> loadedModel.uid == model.uid True >>> loadedModel.transform(df).show() +---+---+---+---------+-----+ | y| x| s| features|label| +---+---+---+---------+-----+ |1.0|1.0| a|[1.0,1.0]| 1.0| |0.0|2.0| b|[2.0,0.0]| 0.0| |0.0|0.0| a|[0.0,1.0]| 0.0| +---+---+---+---------+-----+ ... >>> str(loadedModel) 'RFormulaModel(ResolvedRFormula(label=y, terms=[x,s], hasIntercept=true)) (uid=...)' """
forceIndexLabel=False, stringIndexerOrderType="frequencyDesc", handleInvalid="error"): """ __init__(self, \\*, formula=None, featuresCol="features", labelCol="label", \ forceIndexLabel=False, stringIndexerOrderType="frequencyDesc", \ handleInvalid="error") """
forceIndexLabel=False, stringIndexerOrderType="frequencyDesc", handleInvalid="error"): """ setParams(self, \\*, formula=None, featuresCol="features", labelCol="label", \ forceIndexLabel=False, stringIndexerOrderType="frequencyDesc", \ handleInvalid="error") Sets params for RFormula. """
def setFormula(self, value): """ Sets the value of :py:attr:`formula`. """ return self._set(formula=value)
def setForceIndexLabel(self, value): """ Sets the value of :py:attr:`forceIndexLabel`. """
def setStringIndexerOrderType(self, value): """ Sets the value of :py:attr:`stringIndexerOrderType`. """ return self._set(stringIndexerOrderType=value)
""" Sets the value of :py:attr:`featuresCol`. """ return self._set(featuresCol=value)
""" Sets the value of :py:attr:`labelCol`. """ return self._set(labelCol=value)
""" Sets the value of :py:attr:`handleInvalid`. """ return self._set(handleInvalid=value)
""" Model fitted by :py:class:`RFormula`. Fitting is required to determine the factor levels of formula terms.
.. versionadded:: 1.5.0 """
""" Params for :py:class:`Selector` and :py:class:`SelectorModel`.
.. versionadded:: 3.1.0 """
"The selector type. " + "Supported options: numTopFeatures (default), percentile, fpr, fdr, fwe.", typeConverter=TypeConverters.toString)
Param(Params._dummy(), "numTopFeatures", "Number of features that selector will select, ordered by ascending p-value. " + "If the number of features is < numTopFeatures, then this will select " + "all features.", typeConverter=TypeConverters.toInt)
"will select, ordered by ascending p-value.", typeConverter=TypeConverters.toFloat)
typeConverter=TypeConverters.toFloat)
typeConverter=TypeConverters.toFloat)
typeConverter=TypeConverters.toFloat)
fpr=0.05, fdr=0.05, fwe=0.05)
def getSelectorType(self): """ Gets the value of selectorType or its default value. """ return self.getOrDefault(self.selectorType)
def getNumTopFeatures(self): """ Gets the value of numTopFeatures or its default value. """
def getPercentile(self): """ Gets the value of percentile or its default value. """ return self.getOrDefault(self.percentile)
def getFpr(self): """ Gets the value of fpr or its default value. """ return self.getOrDefault(self.fpr)
def getFdr(self): """ Gets the value of fdr or its default value. """ return self.getOrDefault(self.fdr)
def getFwe(self): """ Gets the value of fwe or its default value. """ return self.getOrDefault(self.fwe)
""" Mixin for Selectors. """
def setSelectorType(self, value): """ Sets the value of :py:attr:`selectorType`. """ return self._set(selectorType=value)
def setNumTopFeatures(self, value): """ Sets the value of :py:attr:`numTopFeatures`. Only applicable when selectorType = "numTopFeatures". """ return self._set(numTopFeatures=value)
def setPercentile(self, value): """ Sets the value of :py:attr:`percentile`. Only applicable when selectorType = "percentile". """ return self._set(percentile=value)
def setFpr(self, value): """ Sets the value of :py:attr:`fpr`. Only applicable when selectorType = "fpr". """ return self._set(fpr=value)
def setFdr(self, value): """ Sets the value of :py:attr:`fdr`. Only applicable when selectorType = "fdr". """ return self._set(fdr=value)
def setFwe(self, value): """ Sets the value of :py:attr:`fwe`. Only applicable when selectorType = "fwe". """ return self._set(fwe=value)
""" Sets the value of :py:attr:`featuresCol`. """ return self._set(featuresCol=value)
""" Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
""" Sets the value of :py:attr:`labelCol`. """ return self._set(labelCol=value)
""" Mixin for Selector models. """
def setFeaturesCol(self, value): """ Sets the value of :py:attr:`featuresCol`. """
def setOutputCol(self, value): """ Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
def selectedFeatures(self): """ List of indices to select (filter). """
""" Chi-Squared feature selection, which selects categorical features to use for predicting a categorical label. The selector supports different selection methods: `numTopFeatures`, `percentile`, `fpr`, `fdr`, `fwe`.
* `numTopFeatures` chooses a fixed number of top features according to a chi-squared test.
* `percentile` is similar but chooses a fraction of all features instead of a fixed number.
* `fpr` chooses all features whose p-values are below a threshold, thus controlling the false positive rate of selection.
* `fdr` uses the `Benjamini-Hochberg procedure <https://en.wikipedia.org/wiki/ False_discovery_rate#Benjamini.E2.80.93Hochberg_procedure>`_ to choose all features whose false discovery rate is below a threshold.
* `fwe` chooses all features whose p-values are below a threshold. The threshold is scaled by 1/numFeatures, thus controlling the family-wise error rate of selection.
By default, the selection method is `numTopFeatures`, with the default number of top features set to 50.
.. deprecated:: 3.1.0 Use UnivariateFeatureSelector
.. versionadded:: 2.0.0
Examples -------- >>> from pyspark.ml.linalg import Vectors >>> df = spark.createDataFrame( ... [(Vectors.dense([0.0, 0.0, 18.0, 1.0]), 1.0), ... (Vectors.dense([0.0, 1.0, 12.0, 0.0]), 0.0), ... (Vectors.dense([1.0, 0.0, 15.0, 0.1]), 0.0)], ... ["features", "label"]) >>> selector = ChiSqSelector(numTopFeatures=1, outputCol="selectedFeatures") >>> model = selector.fit(df) >>> model.getFeaturesCol() 'features' >>> model.setFeaturesCol("features") ChiSqSelectorModel... >>> model.transform(df).head().selectedFeatures DenseVector([18.0]) >>> model.selectedFeatures [2] >>> chiSqSelectorPath = temp_path + "/chi-sq-selector" >>> selector.save(chiSqSelectorPath) >>> loadedSelector = ChiSqSelector.load(chiSqSelectorPath) >>> loadedSelector.getNumTopFeatures() == selector.getNumTopFeatures() True >>> modelPath = temp_path + "/chi-sq-selector-model" >>> model.save(modelPath) >>> loadedModel = ChiSqSelectorModel.load(modelPath) >>> loadedModel.selectedFeatures == model.selectedFeatures True >>> loadedModel.transform(df).take(1) == model.transform(df).take(1) True """
labelCol="label", selectorType="numTopFeatures", percentile=0.1, fpr=0.05, fdr=0.05, fwe=0.05): """ __init__(self, \\*, numTopFeatures=50, featuresCol="features", outputCol=None, \ labelCol="label", selectorType="numTopFeatures", percentile=0.1, fpr=0.05, \ fdr=0.05, fwe=0.05) """
labelCol="labels", selectorType="numTopFeatures", percentile=0.1, fpr=0.05, fdr=0.05, fwe=0.05): """ setParams(self, \\*, numTopFeatures=50, featuresCol="features", outputCol=None, \ labelCol="labels", selectorType="numTopFeatures", percentile=0.1, fpr=0.05, \ fdr=0.05, fwe=0.05) Sets params for this ChiSqSelector. """
""" Model fitted by :py:class:`ChiSqSelector`.
.. versionadded:: 2.0.0 """
JavaMLWritable): """ A feature transformer that adds size information to the metadata of a vector column. VectorAssembler needs size information for its input columns and cannot be used on streaming dataframes without this metadata.
.. versionadded:: 2.3.0
Notes ----- VectorSizeHint modifies `inputCol` to include size metadata and does not have an outputCol.
Examples -------- >>> from pyspark.ml.linalg import Vectors >>> from pyspark.ml import Pipeline, PipelineModel >>> data = [(Vectors.dense([1., 2., 3.]), 4.)] >>> df = spark.createDataFrame(data, ["vector", "float"]) >>> >>> sizeHint = VectorSizeHint(inputCol="vector", size=3, handleInvalid="skip") >>> vecAssembler = VectorAssembler(inputCols=["vector", "float"], outputCol="assembled") >>> pipeline = Pipeline(stages=[sizeHint, vecAssembler]) >>> >>> pipelineModel = pipeline.fit(df) >>> pipelineModel.transform(df).head().assembled DenseVector([1.0, 2.0, 3.0, 4.0]) >>> vectorSizeHintPath = temp_path + "/vector-size-hint-pipeline" >>> pipelineModel.save(vectorSizeHintPath) >>> loadedPipeline = PipelineModel.load(vectorSizeHintPath) >>> loaded = loadedPipeline.transform(df).head().assembled >>> expected = pipelineModel.transform(df).head().assembled >>> loaded == expected True """
typeConverter=TypeConverters.toInt)
"How to handle invalid vectors in inputCol. Invalid vectors include " "nulls and vectors with the wrong size. The options are `skip` (filter " "out rows with invalid vectors), `error` (throw an error) and " "`optimistic` (do not check the vector size, and keep all rows). " "`error` by default.", TypeConverters.toString)
""" __init__(self, \\*, inputCol=None, size=None, handleInvalid="error") """
""" setParams(self, \\*, inputCol=None, size=None, handleInvalid="error") Sets params for this VectorSizeHint. """
def getSize(self): """ Gets size param, the size of vectors in `inputCol`."""
def setSize(self, value): """ Sets size param, the size of vectors in `inputCol`."""
""" Sets the value of :py:attr:`inputCol`. """ return self._set(inputCol=value)
""" Sets the value of :py:attr:`handleInvalid`. """ return self._set(handleInvalid=value)
""" Params for :py:class:`VarianceThresholdSelector` and :py:class:`VarianceThresholdSelectorModel`.
.. versionadded:: 3.1.0 """
"Param for variance threshold. Features with a variance not " + "greater than this threshold will be removed. The default value " + "is 0.0.", typeConverter=TypeConverters.toFloat)
def getVarianceThreshold(self): """ Gets the value of varianceThreshold or its default value. """
JavaMLWritable): """ Feature selector that removes all low-variance features. Features with a variance not greater than the threshold will be removed. The default is to keep all features with non-zero variance, i.e. remove the features that have the same value in all samples.
.. versionadded:: 3.1.0
Examples -------- >>> from pyspark.ml.linalg import Vectors >>> df = spark.createDataFrame( ... [(Vectors.dense([6.0, 7.0, 0.0, 7.0, 6.0, 0.0]),), ... (Vectors.dense([0.0, 9.0, 6.0, 0.0, 5.0, 9.0]),), ... (Vectors.dense([0.0, 9.0, 3.0, 0.0, 5.0, 5.0]),), ... (Vectors.dense([0.0, 9.0, 8.0, 5.0, 6.0, 4.0]),), ... (Vectors.dense([8.0, 9.0, 6.0, 5.0, 4.0, 4.0]),), ... (Vectors.dense([8.0, 9.0, 6.0, 0.0, 0.0, 0.0]),)], ... ["features"]) >>> selector = VarianceThresholdSelector(varianceThreshold=8.2, outputCol="selectedFeatures") >>> model = selector.fit(df) >>> model.getFeaturesCol() 'features' >>> model.setFeaturesCol("features") VarianceThresholdSelectorModel... >>> model.transform(df).head().selectedFeatures DenseVector([6.0, 7.0, 0.0]) >>> model.selectedFeatures [0, 3, 5] >>> varianceThresholdSelectorPath = temp_path + "/variance-threshold-selector" >>> selector.save(varianceThresholdSelectorPath) >>> loadedSelector = VarianceThresholdSelector.load(varianceThresholdSelectorPath) >>> loadedSelector.getVarianceThreshold() == selector.getVarianceThreshold() True >>> modelPath = temp_path + "/variance-threshold-selector-model" >>> model.save(modelPath) >>> loadedModel = VarianceThresholdSelectorModel.load(modelPath) >>> loadedModel.selectedFeatures == model.selectedFeatures True >>> loadedModel.transform(df).take(1) == model.transform(df).take(1) True """
""" __init__(self, \\*, featuresCol="features", outputCol=None, varianceThreshold=0.0) """ "org.apache.spark.ml.feature.VarianceThresholdSelector", self.uid)
""" setParams(self, \\*, featuresCol="features", outputCol=None, varianceThreshold=0.0) Sets params for this VarianceThresholdSelector. """
def setVarianceThreshold(self, value): """ Sets the value of :py:attr:`varianceThreshold`. """ return self._set(varianceThreshold=value)
def setFeaturesCol(self, value): """ Sets the value of :py:attr:`featuresCol`. """ return self._set(featuresCol=value)
def setOutputCol(self, value): """ Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
JavaMLWritable): """ Model fitted by :py:class:`VarianceThresholdSelector`.
.. versionadded:: 3.1.0 """
def setFeaturesCol(self, value): """ Sets the value of :py:attr:`featuresCol`. """
def setOutputCol(self, value): """ Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
def selectedFeatures(self): """ List of indices to select (filter). """
""" Params for :py:class:`UnivariateFeatureSelector` and :py:class:`UnivariateFeatureSelectorModel`.
.. versionadded:: 3.1.0 """
"The feature type. " + "Supported options: categorical, continuous.", typeConverter=TypeConverters.toString)
"The label type. " + "Supported options: categorical, continuous.", typeConverter=TypeConverters.toString)
"The selection mode. " + "Supported options: numTopFeatures (default), percentile, fpr, " + "fdr, fwe.", typeConverter=TypeConverters.toString)
"features that selector will select.", typeConverter=TypeConverters.toFloat)
def getFeatureType(self): """ Gets the value of featureType or its default value. """ return self.getOrDefault(self.featureType)
def getLabelType(self): """ Gets the value of labelType or its default value. """ return self.getOrDefault(self.labelType)
def getSelectionMode(self): """ Gets the value of selectionMode or its default value. """ return self.getOrDefault(self.selectionMode)
def getSelectionThreshold(self): """ Gets the value of selectionThreshold or its default value. """
JavaMLWritable): """ UnivariateFeatureSelector The user can set `featureType` and `labelType`, and Spark will pick the score function based on the specified `featureType` and `labelType`.
The following combination of `featureType` and `labelType` are supported:
- `featureType` `categorical` and `labelType` `categorical`, Spark uses chi-squared, i.e. chi2 in sklearn. - `featureType` `continuous` and `labelType` `categorical`, Spark uses ANOVATest, i.e. f_classif in sklearn. - `featureType` `continuous` and `labelType` `continuous`, Spark uses F-value, i.e. f_regression in sklearn.
The `UnivariateFeatureSelector` supports different selection modes: `numTopFeatures`, `percentile`, `fpr`, `fdr`, `fwe`.
- `numTopFeatures` chooses a fixed number of top features according to a according to a hypothesis. - `percentile` is similar but chooses a fraction of all features instead of a fixed number. - `fpr` chooses all features whose p-values are below a threshold, thus controlling the false positive rate of selection. - `fdr` uses the `Benjamini-Hochberg procedure \ <https://en.wikipedia.org/wiki/False_discovery_rate#Benjamini.E2.80.93Hochberg_procedure>`_ to choose all features whose false discovery rate is below a threshold. - `fwe` chooses all features whose p-values are below a threshold. The threshold is scaled by 1 / `numFeatures`, thus controlling the family-wise error rate of selection.
By default, the selection mode is `numTopFeatures`.
.. versionadded:: 3.1.1
Examples -------- >>> from pyspark.ml.linalg import Vectors >>> df = spark.createDataFrame( ... [(Vectors.dense([1.7, 4.4, 7.6, 5.8, 9.6, 2.3]), 3.0), ... (Vectors.dense([8.8, 7.3, 5.7, 7.3, 2.2, 4.1]), 2.0), ... (Vectors.dense([1.2, 9.5, 2.5, 3.1, 8.7, 2.5]), 1.0), ... (Vectors.dense([3.7, 9.2, 6.1, 4.1, 7.5, 3.8]), 2.0), ... (Vectors.dense([8.9, 5.2, 7.8, 8.3, 5.2, 3.0]), 4.0), ... (Vectors.dense([7.9, 8.5, 9.2, 4.0, 9.4, 2.1]), 4.0)], ... ["features", "label"]) >>> selector = UnivariateFeatureSelector(outputCol="selectedFeatures") >>> selector.setFeatureType("continuous").setLabelType("categorical").setSelectionThreshold(1) UnivariateFeatureSelector... >>> model = selector.fit(df) >>> model.getFeaturesCol() 'features' >>> model.setFeaturesCol("features") UnivariateFeatureSelectorModel... >>> model.transform(df).head().selectedFeatures DenseVector([7.6]) >>> model.selectedFeatures [2] >>> selectorPath = temp_path + "/selector" >>> selector.save(selectorPath) >>> loadedSelector = UnivariateFeatureSelector.load(selectorPath) >>> loadedSelector.getSelectionThreshold() == selector.getSelectionThreshold() True >>> modelPath = temp_path + "/selector-model" >>> model.save(modelPath) >>> loadedModel = UnivariateFeatureSelectorModel.load(modelPath) >>> loadedModel.selectedFeatures == model.selectedFeatures True >>> loadedModel.transform(df).take(1) == model.transform(df).take(1) True """
labelCol="label", selectionMode="numTopFeatures"): """ __init__(self, \\*, featuresCol="features", outputCol=None, \ labelCol="label", selectionMode="numTopFeatures") """ self.uid)
labelCol="labels", selectionMode="numTopFeatures"): """ setParams(self, \\*, featuresCol="features", outputCol=None, \ labelCol="labels", selectionMode="numTopFeatures") Sets params for this UnivariateFeatureSelector. """
def setFeatureType(self, value): """ Sets the value of :py:attr:`featureType`. """
def setLabelType(self, value): """ Sets the value of :py:attr:`labelType`. """
def setSelectionMode(self, value): """ Sets the value of :py:attr:`selectionMode`. """ return self._set(selectionMode=value)
def setSelectionThreshold(self, value): """ Sets the value of :py:attr:`selectionThreshold`. """
""" Sets the value of :py:attr:`featuresCol`. """ return self._set(featuresCol=value)
""" Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
""" Sets the value of :py:attr:`labelCol`. """ return self._set(labelCol=value)
JavaMLWritable): """ Model fitted by :py:class:`UnivariateFeatureSelector`.
.. versionadded:: 3.1.1 """
def setFeaturesCol(self, value): """ Sets the value of :py:attr:`featuresCol`. """
def setOutputCol(self, value): """ Sets the value of :py:attr:`outputCol`. """ return self._set(outputCol=value)
def selectedFeatures(self): """ List of indices to select (filter). """
# The small batch size here ensures that we see multiple batches, # even in these small test examples: .master("local[2]")\ .appName("ml.feature tests")\ .getOrCreate() Row(id=2, label="c"), Row(id=3, label="a"), Row(id=4, label="a"), Row(id=5, label="c")], 2) finally: except OSError: pass sys.exit(-1) |