org.elasticsearch.search.suggest.phrase

Class StupidBackoff

java.lang.Object

org.elasticsearch.search.suggest.phrase.SmoothingModel

org.elasticsearch.search.suggest.phrase.StupidBackoff

All Implemented Interfaces:

NamedWriteable, Writeable, ToXContent, ToXContentFragment

public final class StupidBackoff
extends SmoothingModel

A "stupid-backoff" smoothing model similar to Katz's Backoff. This model is used as the default if no model is configured.

See N-Gram Smoothing for details.

Nested Class Summary

Nested classes/interfaces inherited from interface org.elasticsearch.common.io.stream.Writeable

Writeable.Reader<V>, Writeable.Writer<V>

Nested classes/interfaces inherited from interface org.elasticsearch.common.xcontent.ToXContent

ToXContent.DelegatingMapParams, ToXContent.MapParams, ToXContent.Params

Field Summary

Fields

Modifier and Type	Field and Description
static double	DEFAULT_BACKOFF_DISCOUNT Default discount parameter for StupidBackoff smoothing
static java.lang.String	NAME

Fields inherited from interface org.elasticsearch.common.xcontent.ToXContent

EMPTY_PARAMS

Constructor Summary

Constructors

Constructor and Description
StupidBackoff(double discount) Creates a Stupid-Backoff smoothing model.
StupidBackoff(StreamInput in) Read from a stream.

Method Summary

Modifier and Type	Method and Description
WordScorer.WordScorerFactory	buildWordScorerFactory()
protected boolean	doEquals(SmoothingModel other) subtype specific implementation of "equals".
protected int	doHashCode()
static SmoothingModel	fromXContent(XContentParser parser)
double	getDiscount()
java.lang.String	getWriteableName() Returns the name of the writeable object
protected XContentBuilder	innerToXContent(XContentBuilder builder, ToXContent.Params params)
void	writeTo(StreamOutput out) Write this into the StreamOutput.

Methods inherited from class org.elasticsearch.search.suggest.phrase.SmoothingModel

equals, hashCode, toXContent

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.elasticsearch.common.xcontent.ToXContentFragment

isFragment

Field Detail

DEFAULT_BACKOFF_DISCOUNT

public static final double DEFAULT_BACKOFF_DISCOUNT

Default discount parameter for StupidBackoff smoothing

See Also:

Constant Field Values

NAME

public static final java.lang.String NAME

See Also:

Constant Field Values

Constructor Detail

StupidBackoff

public StupidBackoff(double discount)

Creates a Stupid-Backoff smoothing model.

Parameters:

discount - the discount given to lower order ngrams if the higher order ngram doesn't exits

StupidBackoff

public StupidBackoff(StreamInput in)
              throws java.io.IOException

Read from a stream.

Throws:

java.io.IOException

Method Detail

writeTo

public void writeTo(StreamOutput out)
             throws java.io.IOException

Description copied from interface: Writeable

Write this into the StreamOutput.

Throws:

java.io.IOException

getDiscount

public double getDiscount()

Returns:

the discount parameter of the model

innerToXContent

protected XContentBuilder innerToXContent(XContentBuilder builder,
                                          ToXContent.Params params)
                                   throws java.io.IOException

Specified by:

innerToXContent in class SmoothingModel

Throws:

java.io.IOException

getWriteableName

public java.lang.String getWriteableName()

Description copied from interface: NamedWriteable

Returns the name of the writeable object

doEquals

protected boolean doEquals(SmoothingModel other)

Description copied from class: SmoothingModel

subtype specific implementation of "equals".

Specified by:

doEquals in class SmoothingModel

doHashCode

protected int doHashCode()

Specified by:

doHashCode in class SmoothingModel

fromXContent

public static SmoothingModel fromXContent(XContentParser parser)
                                   throws java.io.IOException

Throws:

java.io.IOException

buildWordScorerFactory

public WordScorer.WordScorerFactory buildWordScorerFactory()

Specified by:

buildWordScorerFactory in class SmoothingModel