org.apache.ctakes.assertion.attributes.features.selection

Class MutualInformationFeatureSelection<OUTCOME_T>

java.lang.Object

org.cleartk.ml.feature.transform.TrainableExtractor_ImplBase<OUTCOME_T>

org.apache.ctakes.assertion.attributes.features.selection.FeatureSelection<OUTCOME_T>

org.apache.ctakes.assertion.attributes.features.selection.MutualInformationFeatureSelection<OUTCOME_T>

All Implemented Interfaces:

com.google.common.base.Predicate<org.cleartk.ml.Feature>, org.cleartk.ml.feature.transform.TrainableExtractor<OUTCOME_T>

public class MutualInformationFeatureSelection<OUTCOME_T>
extends FeatureSelection<OUTCOME_T>

Copyright (c) 2007-2012, Regents of the University of Colorado
All rights reserved.

Selects features via mutual information statistics between the features extracted from its sub-extractor and the outcome values they are paired with in classification instances.

Author:

Lee Becker

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MutualInformationFeatureSelection.CombineScoreMethod Specifies how scores for each outcome should be combined/aggregated into a single score
static class	MutualInformationFeatureSelection.MutualInformationStats<OUTCOME_T> Helper class for aggregating and computing mutual information statistics

Field Summary

Fields inherited from class org.apache.ctakes.assertion.attributes.features.selection.FeatureSelection

isTrained, selectedFeatureNames

Fields inherited from class org.cleartk.ml.feature.transform.TrainableExtractor_ImplBase

name

Constructor Summary

Constructors

Constructor and Description
MutualInformationFeatureSelection(String name)
MutualInformationFeatureSelection(String name, int numFeatures)
MutualInformationFeatureSelection(String name, MutualInformationFeatureSelection.CombineScoreMethod combineScoreMethod, double smoothingCount, int numFeatures)

Method Summary

Modifier and Type	Method and Description
void	load(URI uri)
void	save(URI uri)
void	train(Iterable<org.cleartk.ml.Instance<OUTCOME_T>> instances)

Methods inherited from class org.apache.ctakes.assertion.attributes.features.selection.FeatureSelection

apply, getFeatureName, transform, transform

Methods inherited from class org.cleartk.ml.feature.transform.TrainableExtractor_ImplBase

isTransformable, selectTransformableFeatures

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.google.common.base.Predicate

equals

Constructor Detail

MutualInformationFeatureSelection

public MutualInformationFeatureSelection(String name)

MutualInformationFeatureSelection

public MutualInformationFeatureSelection(String name,
                                         int numFeatures)

MutualInformationFeatureSelection

public MutualInformationFeatureSelection(String name,
                                         MutualInformationFeatureSelection.CombineScoreMethod combineScoreMethod,
                                         double smoothingCount,
                                         int numFeatures)

Method Detail

train

public void train(Iterable<org.cleartk.ml.Instance<OUTCOME_T>> instances)

save

public void save(URI uri)
          throws IOException

Throws:

IOException

load

public void load(URI uri)
          throws IOException

Throws:

IOException