OneHotEncoder

class pyspark.ml.feature.OneHotEncoder(inputCols=None, outputCols=None, handleInvalid='error', dropLast=True, inputCol=None, outputCol=None)[source]

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 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].

Note

This is different from scikit-learn’s OneHotEncoder, which keeps all categories. The output vectors are sparse.

When handleInvalid is configured to ‘keep’, an extra “category” indicating invalid values is added as last category. So when dropLast is true, invalid values are encoded as all-zeros vector.

Note

When encoding multi-column by using inputCols and 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

>>> 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

New in version 2.3.0.

Methods

Attributes

Methods Documentation

clear(param)

Clears a param from the param map if it has been explicitly set.

copy(extra=None)

Creates a copy of this instance with the same uid and some extra params. This implementation first calls Params.copy and then make a copy of the companion Java pipeline component with extra params. So both the Python wrapper and the Java pipeline component get copied.

Parameters

extra – Extra parameters to copy to the new instance

Returns

Copy of this instance

explainParam(param)

Explains a single param and returns its name, doc, and optional default value and user-supplied value in a string.

explainParams()

Returns the documentation of all params with their optionally default values and user-supplied values.

extractParamMap(extra=None)

Extracts the embedded default param values and user-supplied values, and then merges them with extra values from input into a flat param map, where the latter value is used if there exist conflicts, i.e., with ordering: default param values < user-supplied values < extra.

Parameters

extra – extra param values

Returns

merged param map

fit(dataset, params=None)

Fits a model to the input dataset with optional parameters.

Parameters
  • dataset – input dataset, which is an instance of pyspark.sql.DataFrame

  • params – an optional param map that overrides embedded params. If a list/tuple of param maps is given, this calls fit on each param map and returns a list of models.

Returns

fitted model(s)

New in version 1.3.0.

fitMultiple(dataset, paramMaps)

Fits a model to the input dataset for each param map in paramMaps.

Parameters
  • dataset – input dataset, which is an instance of pyspark.sql.DataFrame.

  • paramMaps – A Sequence of param maps.

Returns

A thread safe iterable which contains one model for each param map. Each call to next(modelIterator) will return (index, model) where model was fit using paramMaps[index]. index values may not be sequential.

New in version 2.3.0.

getDropLast()

Gets the value of dropLast or its default value.

New in version 2.3.0.

getHandleInvalid()

Gets the value of handleInvalid or its default value.

getInputCol()

Gets the value of inputCol or its default value.

getInputCols()

Gets the value of inputCols or its default value.

getOrDefault(param)

Gets the value of a param in the user-supplied param map or its default value. Raises an error if neither is set.

getOutputCol()

Gets the value of outputCol or its default value.

getOutputCols()

Gets the value of outputCols or its default value.

getParam(paramName)

Gets a param by its name.

hasDefault(param)

Checks whether a param has a default value.

hasParam(paramName)

Tests whether this instance contains a param with a given (string) name.

isDefined(param)

Checks whether a param is explicitly set by user or has a default value.

isSet(param)

Checks whether a param is explicitly set by user.

classmethod load(path)

Reads an ML instance from the input path, a shortcut of read().load(path).

classmethod read()

Returns an MLReader instance for this class.

save(path)

Save this ML instance to the given path, a shortcut of ‘write().save(path)’.

set(param, value)

Sets a parameter in the embedded param map.

setDropLast(value)[source]

Sets the value of dropLast.

New in version 2.3.0.

setHandleInvalid(value)[source]

Sets the value of handleInvalid.

New in version 3.0.0.

setInputCol(value)[source]

Sets the value of inputCol.

New in version 3.0.0.

setInputCols(value)[source]

Sets the value of inputCols.

New in version 3.0.0.

setOutputCol(value)[source]

Sets the value of outputCol.

New in version 3.0.0.

setOutputCols(value)[source]

Sets the value of outputCols.

New in version 3.0.0.

setParams(self, inputCols=None, outputCols=None, handleInvalid='error', dropLast=True, inputCol=None, outputCol=None)[source]

Sets params for this OneHotEncoder.

New in version 2.3.0.

write()

Returns an MLWriter instance for this ML instance.

Attributes Documentation

dropLast = Param(parent='undefined', name='dropLast', doc='whether to drop the last category')
handleInvalid = Param(parent='undefined', name='handleInvalid', doc="How to handle invalid data during 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.")
inputCol = Param(parent='undefined', name='inputCol', doc='input column name.')
inputCols = Param(parent='undefined', name='inputCols', doc='input column names.')
outputCol = Param(parent='undefined', name='outputCol', doc='output column name.')
outputCols = Param(parent='undefined', name='outputCols', doc='output column names.')
params

Returns all params ordered by name. The default implementation uses dir() to get all attributes of type Param.