org.apache.spark.ml.feature

Class Tokenizer

java.lang.Object

org.apache.spark.ml.PipelineStage

org.apache.spark.ml.Transformer

org.apache.spark.ml.UnaryTransformer<java.lang.String,scala.collection.Seq<java.lang.String>,Tokenizer>

org.apache.spark.ml.feature.Tokenizer

All Implemented Interfaces:

java.io.Serializable, Logging, Params, Identifiable

public class Tokenizer
extends UnaryTransformer<java.lang.String,scala.collection.Seq<java.lang.String>,Tokenizer>

:: Experimental :: A tokenizer that converts the input string to lowercase and then splits it by white spaces.

See Also:

RegexTokenizer, Serialized Form

Constructor Summary

Constructors

Constructor and Description
Tokenizer()
Tokenizer(java.lang.String uid)

Method Summary

Methods

Modifier and Type	Method and Description
Tokenizer	copy(ParamMap extra) Creates a copy of this instance with the same UID and some extra params.
protected scala.Function1<java.lang.String,scala.collection.Seq<java.lang.String>>	createTransformFunc() Creates the transform function using the given param map.
protected DataType	outputDataType() Returns the data type of the output column.
java.lang.String	uid() An immutable unique ID for the object and its derivatives.
protected void	validateInputType(DataType inputType) Validates the input type.

Methods inherited from class org.apache.spark.ml.UnaryTransformer

setInputCol, setOutputCol, transform, transformSchema

Methods inherited from class org.apache.spark.ml.Transformer

transform, transform, transform

Methods inherited from class org.apache.spark.ml.PipelineStage

transformSchema

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.spark.Logging

initializeIfNecessary, initializeLogging, isTraceEnabled, log_, log, logDebug, logDebug, logError, logError, logInfo, logInfo, logName, logTrace, logTrace, logWarning, logWarning

Methods inherited from interface org.apache.spark.ml.param.Params

clear, copyValues, defaultCopy, defaultParamMap, explainParam, explainParams, extractParamMap, extractParamMap, get, getDefault, getOrDefault, getParam, hasDefault, hasParam, isDefined, isSet, paramMap, params, set, set, set, setDefault, setDefault, shouldOwn, validateParams

Methods inherited from interface org.apache.spark.ml.util.Identifiable

toString

Constructor Detail

Tokenizer

public Tokenizer(java.lang.String uid)

Tokenizer

public Tokenizer()

Method Detail

uid

public java.lang.String uid()

Description copied from interface: Identifiable

An immutable unique ID for the object and its derivatives.

Returns:

(undocumented)

createTransformFunc

protected scala.Function1<java.lang.String,scala.collection.Seq<java.lang.String>> createTransformFunc()

Description copied from class: UnaryTransformer

Creates the transform function using the given param map. The input param map already takes account of the embedded param map. So the param values should be determined solely by the input param map.

Specified by:

createTransformFunc in class UnaryTransformer<java.lang.String,scala.collection.Seq<java.lang.String>,Tokenizer>

Returns:

(undocumented)

validateInputType

protected void validateInputType(DataType inputType)

Description copied from class: UnaryTransformer

Validates the input type. Throw an exception if it is invalid.

Overrides:

validateInputType in class UnaryTransformer<java.lang.String,scala.collection.Seq<java.lang.String>,Tokenizer>

Parameters:

inputType - (undocumented)

outputDataType

protected DataType outputDataType()

Description copied from class: UnaryTransformer

Returns the data type of the output column.

Specified by:

outputDataType in class UnaryTransformer<java.lang.String,scala.collection.Seq<java.lang.String>,Tokenizer>

Returns:

(undocumented)

copy

public Tokenizer copy(ParamMap extra)

Description copied from interface: Params

Creates a copy of this instance with the same UID and some extra params. Subclasses should implement this method and set the return type properly.

Specified by:

copy in interface Params

Overrides:

copy in class UnaryTransformer<java.lang.String,scala.collection.Seq<java.lang.String>,Tokenizer>

Parameters:

extra - (undocumented)

Returns:

(undocumented)

See Also:

defaultCopy()