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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.searchlib.mlr.ga;
import java.util.HashSet;
import java.util.Set;
/**
* @author bratseth
*/
public class TrainingParameters {
// A note:
// The total number of species generated and evaluated is
// (generationCandidatesFactor * speciesLifespan * (initialSpeciesSize-finalSpeciesSize)/2 ) ^ speciesLevels
// (speciesLevel is hardcoded to 2 atm)
private int speciesLifespan = 1000;
private int initialSpeciesSize = 10;
private double finalSpeciesSize = 1;
private int generationCandidatesFactor = 3;
private int maxExpressionDepth = 6;
private boolean allowConditions = true;
private boolean errorIsRelative = true;
private Set<String> excludeFeatures = new HashSet<>();
private String trainingSetFormat = null;
private double validationFraction = 0.2;
/** The number of generation which a given species (or super-species at any level) lives. Default:1000 */
public int getSpeciesLifespan() { return speciesLifespan; }
public void setSpeciesLifespan(int generations) { this.speciesLifespan = generations; }
/** The number of members in a species (or super-species at any level) as it is created. Default: 10 */
public int getInitialSpeciesSize() { return initialSpeciesSize; }
public void setInitialSpeciesSize(int initialSpeciesSize) { this.initialSpeciesSize = initialSpeciesSize; }
/**
* The number of members in a species in its final generation.
* The size of the species will be reduced linearly in each generation to go from initial size to final size.
* Default: 1
*/
public double getFinalSpeciesSize() { return finalSpeciesSize; }
public void setFinalSpeciesSize(int finalSpeciesSize) { this.finalSpeciesSize = finalSpeciesSize; }
/*
* The factor determining how many more members are generated than are allowed to survive in each generation of a species.
* Default: 3
*/
public int getGenerationCandidatesFactor() { return generationCandidatesFactor; }
public void setGenerationCandidatesFactor(int generationCandidatesFactor) { this.generationCandidatesFactor = generationCandidatesFactor; }
/**
* The max depth of expressions this is allowed to generate.
* Default: 6
*/
public int getMaxExpressionDepth() { return maxExpressionDepth; }
public void setMaxExpressionDepth(int maxExpressionDepth) { this.maxExpressionDepth = maxExpressionDepth; }
/**
* Whether mutation should allow creation of condition (if) expressions.
* Default: true
*/
public boolean getAllowConditions() { return allowConditions; }
public void setAllowConditions(boolean allowConditions) { this.allowConditions = allowConditions; }
/**
* Whether errors are relative to the absolute value of the function at that point or not.
* If true, training will assign equal weight to the error of 1.1 for 1 and 110 for 100.
* If false, training will instead assign a 10x weight to the latter.
* Default: True.
*/
public boolean getErrorIsRelative() { return errorIsRelative; }
public void setErrorIsRelative(boolean errorIsRelative) { this.errorIsRelative = errorIsRelative; }
/**
* Returns the set of features to exclude during training.
* Returned as an immutable set, never null.
*/
public Set<String> getExcludeFeatures() { return excludeFeatures; }
/** Sets the features to exclude from a comma-separated string */
public void setExcludeFeatures(String excludeFeatureString) {
for (String featureName : excludeFeatureString.split(","))
excludeFeatures.add(featureName.trim());
}
/**
* Returns the format of the training set to read. "fv" or "cvs" is supported.
* If this is null the format name is taken from the last name of the file instead.
* Default: null.
*/
public String getTrainingSetFormat() { return trainingSetFormat; }
public void setTrainingSetFormat(String trainingSetFormat) { this.trainingSetFormat = trainingSetFormat; }
/**
* Returns the fraction of the result set to hold out of training and use for validation.
* Default 0.2
*/
public double getValidationFraction() { return validationFraction; }
public void setValidationFraction(double validationFraction) { this.validationFraction = validationFraction; }
}
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