org.apache.spark.ml.feature

Class StopWordsRemover

Object

org.apache.spark.ml.PipelineStage

org.apache.spark.ml.Transformer

org.apache.spark.ml.feature.StopWordsRemover

All Implemented Interfaces:

java.io.Serializable, Logging, Params, HasInputCol, HasOutputCol, DefaultParamsWritable, Identifiable, MLWritable

public class StopWordsRemover
extends Transformer
implements HasInputCol, HasOutputCol, DefaultParamsWritable

A feature transformer that filters out stop words from input.

See Also:

Stop words (Wikipedia), Serialized Form

Note:

null values from input array are preserved unless adding null to stopWords explicitly.

Constructor Summary

Constructors

Constructor and Description
StopWordsRemover()
StopWordsRemover(String uid)

Method Summary

Modifier and Type	Method and Description
BooleanParam	caseSensitive() Whether to do a case sensitive comparison over the stop words.
StopWordsRemover	copy(ParamMap extra) Creates a copy of this instance with the same UID and some extra params.
boolean	getCaseSensitive()
String	getLocale()
String[]	getStopWords()
static StopWordsRemover	load(String path)
static String[]	loadDefaultStopWords(String language) Loads the default stop words for the given language.
Param<String>	locale() Locale of the input for case insensitive matching.
static MLReader<T>	read()
StopWordsRemover	setCaseSensitive(boolean value)
StopWordsRemover	setInputCol(String value)
StopWordsRemover	setLocale(String value)
StopWordsRemover	setOutputCol(String value)
StopWordsRemover	setStopWords(String[] value)
StringArrayParam	stopWords() The words to be filtered out.
Dataset<Row>	transform(Dataset<?> dataset) Transforms the input dataset.
StructType	transformSchema(StructType schema) :: DeveloperApi ::
String	uid() An immutable unique ID for the object and its derivatives.

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

transform, transform, transform

Methods inherited from class Object

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

Methods inherited from interface org.apache.spark.ml.param.shared.HasInputCol

getInputCol, inputCol

Methods inherited from interface org.apache.spark.ml.param.shared.HasOutputCol

getOutputCol, outputCol

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

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

toString

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

write

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

save

Methods inherited from interface org.apache.spark.internal.Logging

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

Constructor Detail

StopWordsRemover

public StopWordsRemover(String uid)

StopWordsRemover

public StopWordsRemover()

Method Detail

load

public static StopWordsRemover load(String path)

loadDefaultStopWords

public static String[] loadDefaultStopWords(String 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

Parameters:

language - (undocumented)

Returns:

(undocumented)

See Also:

here

read

public static MLReader<T> read()

uid

public String uid()

Description copied from interface: Identifiable

An immutable unique ID for the object and its derivatives.

Specified by:

uid in interface Identifiable

Returns:

(undocumented)

setInputCol

public StopWordsRemover setInputCol(String value)

setOutputCol

public StopWordsRemover setOutputCol(String value)

stopWords

public StringArrayParam stopWords()

The words to be filtered out. Default: English stop words

Returns:

(undocumented)

See Also:

StopWordsRemover.loadDefaultStopWords()

setStopWords

public StopWordsRemover setStopWords(String[] value)

getStopWords

public String[] getStopWords()

caseSensitive

public BooleanParam caseSensitive()

Whether to do a case sensitive comparison over the stop words. Default: false

Returns:

(undocumented)

setCaseSensitive

public StopWordsRemover setCaseSensitive(boolean value)

getCaseSensitive

public boolean getCaseSensitive()

locale

public Param<String> locale()

Locale of the input for case insensitive matching. Ignored when caseSensitive is true. Default: Locale.getDefault.toString

Returns:

(undocumented)

setLocale

public StopWordsRemover setLocale(String value)

getLocale

public String getLocale()

transform

public Dataset<Row> transform(Dataset<?> dataset)

Description copied from class: Transformer

Transforms the input dataset.

Specified by:

transform in class Transformer

Parameters:

dataset - (undocumented)

Returns:

(undocumented)

transformSchema

public StructType transformSchema(StructType schema)

Description copied from class: PipelineStage

:: DeveloperApi ::

Check transform validity and derive the output schema from the input schema.

We check validity for interactions between parameters during transformSchema and raise an exception if any parameter value is invalid. Parameter value checks which do not depend on other parameters are handled by Param.validate().

Typical implementation should first conduct verification on schema change and parameter validity, including complex parameter interaction checks.

Specified by:

transformSchema in class PipelineStage

Parameters:

schema - (undocumented)

Returns:

(undocumented)

copy

public StopWordsRemover 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. See defaultCopy().

Specified by:

copy in interface Params

Specified by:

copy in class Transformer

Parameters:

extra - (undocumented)

Returns:

(undocumented)