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/*
* File: VectorCogxelMap.java
* Authors: Justin Basilico and Kevin R. Dixon
* Company: Sandia National Laboratories
* Project: Cognitive Framework Lite
*
* Copyright June 21, 2007, Sandia Corporation. Under the terms of Contract
* DE-AC04-94AL85000, there is a non-exclusive license for use of this work by
* or on behalf of the U.S. Government. Export of this program may require a
* license from the United States Government. See CopyrightHistory.txt for
* complete details.
*
*
*/
package gov.sandia.cognition.framework.learning.converter;
import gov.sandia.cognition.collection.CollectionUtil;
import gov.sandia.cognition.framework.Cogxel;
import gov.sandia.cognition.framework.CogxelFactory;
import gov.sandia.cognition.framework.CogxelState;
import gov.sandia.cognition.framework.DefaultCogxelFactory;
import gov.sandia.cognition.framework.SemanticIdentifier;
import gov.sandia.cognition.framework.SemanticIdentifierMap;
import gov.sandia.cognition.framework.SemanticLabel;
import gov.sandia.cognition.math.matrix.DefaultVectorFactoryContainer;
import gov.sandia.cognition.math.matrix.DimensionalityMismatchException;
import gov.sandia.cognition.math.matrix.Vector;
import gov.sandia.cognition.math.matrix.VectorFactory;
import gov.sandia.cognition.math.matrix.VectorFactoryContainer;
import gov.sandia.cognition.util.ObjectUtil;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
/**
* The CogxelVectorConverter implements a converter to convert Cogxels to and
* from Vector objects.
*
* @author Justin Basilico
* @author Kevin R. Dixon
* @since 1.0
*/
public class CogxelVectorConverter
extends DefaultVectorFactoryContainer
implements CogxelConverter
{
/** The labels for each of the elements in the vector. */
private ArrayList labels;
/** The current SemanticIdentifierMap. */
private SemanticIdentifierMap semanticIdentifierMap;
/** The list of SemanticIdentifiers, whose positions correspond to
* positions in the vector. */
private ArrayList identifiers;
/** The mapping of SemanticIdentifiers to vector indices. */
private HashMap identifierToIndexMap;
/** The CogxelFactory to use. */
private CogxelFactory cogxelFactory;
/**
* Creates a new, empty instance of VectorCogxelMap.
*/
public CogxelVectorConverter()
{
super();
this.setLabels(new ArrayList());
this.setSemanticIdentifierMap(null);
this.setIdentifiers(new ArrayList());
this.setIdentifierToIndexMap(new HashMap());
this.setVectorFactory(VectorFactory.getDefault());
this.setCogxelFactory(DefaultCogxelFactory.INSTANCE);
}
/**
* Creates a new CogxelVectorConverter from the given labels.
*
* @param labels The labels to use.
*/
public CogxelVectorConverter(
SemanticLabel... labels)
{
this(labels, null);
}
/**
* Creates a new CogxelVectorConverter from the given labels.
*
* @param labels The labels to use.
*/
public CogxelVectorConverter(
Iterable labels)
{
this(labels, null);
}
/**
* Creates a new CogxelVectorConverter from the given SemanticIdentifierMap
* and SemanticLabels.
*
* @param labels The labels to use.
* @param semanticIdentifierMap The SemanticIdentifierMap to use.
*/
public CogxelVectorConverter(
SemanticLabel[] labels,
SemanticIdentifierMap semanticIdentifierMap)
{
this(Arrays.asList(labels), semanticIdentifierMap);
}
/**
* Creates a new CogxelVectorConverter from the given SemanticIdentifierMap
* and SemanticLabels.
*
* @param labels The labels to use.
* @param semanticIdentifierMap The SemanticIdentifierMap to use.
*/
public CogxelVectorConverter(
Iterable labels,
SemanticIdentifierMap semanticIdentifierMap)
{
this();
this.addLabels(labels);
this.setSemanticIdentifierMap(semanticIdentifierMap);
}
/**
* Creates a new CogxelVectorConverter
*
* @param labels The labels to use.
* @param semanticIdentifierMap The SemanticIdentifierMap to use.
* @param vectorFactory The VectorFactory to use.
* @param cogxelFactory The CogxelFactory to use.
*/
public CogxelVectorConverter(
SemanticLabel[] labels,
SemanticIdentifierMap semanticIdentifierMap,
VectorFactory vectorFactory,
CogxelFactory cogxelFactory)
{
this(Arrays.asList(labels), semanticIdentifierMap, vectorFactory,
cogxelFactory);
}
/**
* Creates a new CogxelVectorConverter.
*
* @param labels The labels to use.
* @param semanticIdentifierMap The SemanticIdentifierMap to use.
* @param vectorFactory The VectorFactory to use.
* @param cogxelFactory The CogxelFactory to use.
*/
public CogxelVectorConverter(
Iterable labels,
SemanticIdentifierMap semanticIdentifierMap,
VectorFactory vectorFactory,
CogxelFactory cogxelFactory)
{
this(labels, semanticIdentifierMap);
this.setVectorFactory(vectorFactory);
this.setCogxelFactory(cogxelFactory);
}
/**
* Creates a new copy of the given CogxelVectorConverter.
*
* @param other The CogxeLVectorConverter to copy.
*/
public CogxelVectorConverter(
CogxelVectorConverter other)
{
this(new ArrayList(other.getLabels()),
other.getSemanticIdentifierMap(),
other.getVectorFactory(),
other.getCogxelFactory());
}
/**
* {@inheritDoc}
*
* @return {@inheritDoc}
*/
@Override
public CogxelVectorConverter clone()
{
return new CogxelVectorConverter(this);
}
/**
* Adds the given SemanticLabel to the list of labels used by the
* converter.
*
* @param label The label to add.
*/
public void addLabel(
SemanticLabel label)
{
// Validate the parameters.
if ( label == null )
{
throw new IllegalArgumentException("label is null");
}
// Add the label.
this.getLabels().add(label);
this.addLabelToIdentifierCache(label);
}
/**
* Adds all of the given labels to the converter.
*
* @param labels The labels to add to the converter.
*/
public void addLabels(
Iterable labels)
{
for ( SemanticLabel label : labels )
{
this.addLabel(label);
}
}
/**
* Adds all of the given labels to the converter.
*
* @param labels The labels to add to the converter.
*/
public void addLabels(
SemanticLabel[] labels)
{
for ( SemanticLabel label : labels )
{
this.addLabel(label);
}
}
/**
* Rebuilds the cache of SemanticIdentifier objects. Should only need to
* be called after the SemanticIdentifierMap is changed.
*/
protected void buildIdentifierCache()
{
// Clear out the semantic identifier containers.
this.setIdentifiers(
new ArrayList());
this.setIdentifierToIndexMap(
new HashMap());
// Add each label to the cache.
SemanticIdentifierMap identifierMap = this.getSemanticIdentifierMap();
if ( identifierMap != null )
{
for ( SemanticLabel label : this.getLabels() )
{
this.addLabelToIdentifierCache(label);
}
}
// else - There is no map so we don't put anything in the cache.
}
/**
* Adds the given label to the cache of SemanticIdentifiers. This is used
* so that the fast SemanticIdentifiers can be used by the converter
* instead of the SemanticLabel.
*
* @param label The label to add.
*/
protected void addLabelToIdentifierCache(
SemanticLabel label)
{
if ( this.semanticIdentifierMap == null )
{
// No identifier map is specified.
return;
}
// Get the identifier for the label and add it to the cache.
SemanticIdentifier identifier =
this.getSemanticIdentifierMap().addLabel(label);
int index = this.getIdentifiers().size();
this.getIdentifiers().add(identifier);
this.getIdentifierToIndexMap().put(identifier, index);
}
/**
* {@inheritDoc}
*
* @param cogxels {@inheritDoc}
* @return {@inheritDoc}
*/
public Vector fromCogxels(
CogxelState cogxels)
{
// Validate the parameters.
if ( cogxels == null )
{
throw new IllegalArgumentException("cogxels is null");
}
// Validate the state.
if ( this.getSemanticIdentifierMap() == null )
{
throw new IllegalStateException(
"The semanticIdentifierMap is not set.");
}
// Create the vectors to store the inputs and outputs.
Vector vector = this.createEmptyVector();
// Choose which way to iterate over the cogxels by figuring out how
// many there are and how big the vector is.
if ( cogxels.getNumCogxels() > this.getDimensionality() )
{
// This is optimized for the case when the number of labels in the
// converter is less than the number of cogxels.
int index = 0;
for ( SemanticIdentifier identifier : this.getIdentifiers() )
{
double value = cogxels.getCogxelActivation(identifier);
vector.setElement(index, value);
index++;
}
}
else
{
// This is optimized for the case where the majority of the Cogxels
// are expected to be zero.
for ( Cogxel cogxel : cogxels )
{
// Get the index of the identifier.
SemanticIdentifier identifier = cogxel.getSemanticIdentifier();
int index = this.findIndexForIdentifier(identifier);
if ( index < 0 )
{
// Not a part of our vector.
continue;
}
// Get the cogxel.
double value = cogxel.getActivation();
vector.setElement(index, value);
}
}
// Return the created vector.
return vector;
}
/**
* {@inheritDoc}
*
* @param data {@inheritDoc}
* @param cogxels {@inheritDoc}
*/
public void toCogxels(
Vector data,
CogxelState cogxels)
{
// Validate the parameters.
if ( data == null )
{
throw new IllegalArgumentException("data is null");
}
else if ( cogxels == null )
{
throw new IllegalArgumentException("cogxels is null");
}
// Validate the state.
if ( this.getSemanticIdentifierMap() == null )
{
throw new IllegalStateException(
"The semanticIdentifierMap is not set.");
}
// Make sure the given Vector is of the proper dimensionality.
int dimensionality = data.getDimensionality();
if ( dimensionality != this.getDimensionality() )
{
throw new DimensionalityMismatchException(dimensionality,
this.getDimensionality());
}
// Copy the values into the CogxelState.
CogxelFactory factory = this.getCogxelFactory();
for (int i = 0; i < dimensionality; i++)
{
// Get the value from the i-th element of the vector.
double value = data.getElement(i);
// Get the i-th identifier.
SemanticIdentifier identifier = this.getIdentifiers().get(i);
// Get or create the Cogxel.
Cogxel cogxel =
cogxels.getOrCreateCogxel(identifier, factory);
// Set the Cogxel's activation.
cogxel.setActivation(value);
}
}
/**
* Finds the vector index for the given SemanticIdentifier.
*
* @param identifier The SemanticIdentifier to find the integer index for.
* @return The integer index for the given SemanticIdentifier, if it is
* an identifier this converter is using; otherwise, -1.
*/
protected int findIndexForIdentifier(
SemanticIdentifier identifier)
{
// look for th index.
Integer index = this.getIdentifierToIndexMap().get(identifier);
if ( index == null )
{
// The index does not exist.
return -1;
}
else
{
// The index was located.
return index;
}
}
/**
* {@inheritDoc}
*
* @param other {@inheritDoc}
* @return {@inheritDoc}
*/
@Override
public boolean equals(
Object other)
{
if ( other instanceof CogxelVectorConverter )
{
return this.equals((CogxelVectorConverter) other);
}
else
{
return false;
}
}
/**
* Returns true if the two converters have the same labels.
*
* @param other Another CogxelVectorConverter.
* @return True if the two converters have the same labels.
*/
public boolean equals(
CogxelVectorConverter other)
{
if ( other == null || other.getDimensionality() != this.getDimensionality() )
{
return false;
}
int length = this.getDimensionality();
for (int i = 0; i < length; i++)
{
if ( !this.getLabels().get(i).equals(other.getLabels().get(i)) )
{
return false;
}
}
return true;
}
@Override
public int hashCode()
{
int hash = 7;
if (!CollectionUtil.isEmpty(this.labels))
{
for (SemanticLabel label : this.labels)
{
hash = 43 * hash + ObjectUtil.hashCodeSafe(label);
}
}
return hash;
}
/**
* Creates an empty Vector for the converter, of the proper dimensionality.
*
* @return An empty Vector for the converter to use.
*/
public Vector createEmptyVector()
{
return this.getVectorFactory().createVector(this.getDimensionality());
}
/**
* Gets the dimensionality of the Vector created by the converter.
*
* @return The dimensionality of the Vector created by the converter.
*/
public int getDimensionality()
{
return this.getLabels().size();
}
/**
* {@inheritDoc}
*
* @return {@inheritDoc}
*/
public SemanticIdentifierMap getSemanticIdentifierMap()
{
return semanticIdentifierMap;
}
/**
* {@inheritDoc}
*
* @param semanticIdentifierMap {@inheritDoc}
*/
public void setSemanticIdentifierMap(
SemanticIdentifierMap semanticIdentifierMap)
{
this.semanticIdentifierMap = semanticIdentifierMap;
this.buildIdentifierCache();
}
/**
* Gets the labels used by the converter, each one corresponding to one
* dimension in the converted Vector.
*
* @return The labels used by the converter.
*/
public ArrayList getLabels()
{
return this.labels;
}
/**
* Sets the labels to be used by the converter, each one corresponding to
* one dimension in the converted Vector.
*
* @param labels The labels to be used by the converter.
*/
public void setLabels(
ArrayList labels)
{
this.labels = labels;
this.buildIdentifierCache();
}
/**
* Gets the list of cached SemanticIdentifiers.
*
* @return The list of cached SemanticIdentifiers.
*/
protected ArrayList getIdentifiers()
{
return this.identifiers;
}
/**
* Sets the list of cached SemanticIdentifiers.
*
* @param identifiers The list of cached SemanticIdentifiers.
*/
protected void setIdentifiers(
ArrayList identifiers)
{
this.identifiers = identifiers;
}
/**
* Gets the cached mapping of SemanticIdentifier to vector index.
*
* @return The cached mapping of SemanticIdentifier to vector index.
*/
protected HashMap getIdentifierToIndexMap()
{
return this.identifierToIndexMap;
}
/**
* Sets the cached mapping of SemanticIdentifier to vector index.
*
* @param identifierToIndexMap The cached mapping of SemanticIdentifier
* to vector index.
*/
protected void setIdentifierToIndexMap(
HashMap identifierToIndexMap)
{
this.identifierToIndexMap = identifierToIndexMap;
}
/**
* Gets the CogxelFactory used to create the Cogxels used by the converter.
*
* @return The CogxelFactory used to create the Cogxels used by the
* converter.
*/
public CogxelFactory getCogxelFactory()
{
return this.cogxelFactory;
}
/**
* Gets the CogxelFactory used to create the Cogxels used by the converter.
*
* @param cogxelFactory The CogxelFactory used to create the Cogxels used
* by the converter.
*/
public void setCogxelFactory(
CogxelFactory cogxelFactory)
{
this.cogxelFactory = cogxelFactory;
}
}
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