bbn
Class NodeManager

java.lang.Object
  |
  +--bbn.NodeManager

public class NodeManager

extends java.lang.Object

Title: NodeManager.java Description: Core Bayesian Network class Copyright: Copyright (c) 2001 Company: KSU / KDD

Field Summary

protected java.io.BufferedReader

bufferedReader

Constructor Summary

NodeManager(BBN newNetwork)
NodeManager constructs and initializes the Node Manager.

Method Summary

double	getAttributeValue(int nodeIndex, int attributeIndex)
java.util.Vector	getEvidenceBits()
java.util.Vector	getEvidenceNodeNames()
java.util.Vector	getEvidenceNodes() getEvidenceNodes returns a vector of Node objects containing all of the nodes that are evidence nodes.
double	getEvidenceSetProbability() getStateSetProbability returns the probability of an instantiation by using the chain rule.
java.util.Vector	getEvidenceValues() getEvidenceValues returns the instantiation of nodes in the evidence file
BBN	getNetwork()
java.util.Vector	getNodeNames()
java.util.Vector	getNodePercenteges()
double	getProbabilityOfNodeGivenParents(Node node) getProbabilityOfNodeGivenParents returns the probability of a certain node given the state of its parents.
double	getProbabilityOfNodeGivenParents(Node node, boolean ignoreEvidence)
java.util.Vector	getQueryNodeNames() getQueryNodeNames return a vector of Strings containing all of the names of nodes that are query nodes.
java.util.Vector	getQueryNodes() getQueryNodes returns a vector of Node objects containing all of the nodes that are query nodes.
double	getStateSetProbability() getStateSetProbability returns the probability of an instantiation by using the chain rule.
int	getValue(int index) getValue returns the requested node's current state.
int	getValue(Node node) getValue returns the requested node's current state.
int	getValue(java.lang.String nodeName) getValue returns the requested node's current state.
boolean	hasMoreLines() hasMoreLines determines if there is another state set to read.
boolean	isEvidence(int index) isEvidence returns true if the requested node index is an evidence.
boolean	isEvidence(Node node) isEvidence returns true if the requested node is an evidence.
boolean	isEvidence(java.lang.String nodeName) isEvidence returns true if the requested node name is an evidence.
void	loadEvidenceAtLine(int i) loadEvidenceAtLine loads the instantiation from the evidence file at the given line
boolean	openEvidenceFile(java.lang.String fileName) openEvidenceFile opens an evidence file, reads the structure of the file, and initializes the node manager layout.
boolean	readNextValues() readNextValues reads the next state set from the file.
java.lang.String	report()
java.lang.String	reportProbabilities()
java.lang.String	reportSimpleValues()
java.util.Vector	reportSimpleVector()
void	resetValues()
void	setAttributeValue(int nodeIndex, int attributeIndex, java.lang.Double value)
void	setEvidenceBitvector(java.util.Vector bits)
void	setNetwork(BBN network)
void	setValue(int node, int newState)
void	setValue(Node node, int newState)
void	setValues(java.util.Vector newStates) Sets node states to the given values.

Methods inherited from class java.lang.Object

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

Field Detail

bufferedReader

protected java.io.BufferedReader bufferedReader

Constructor Detail

NodeManager

public NodeManager(BBN newNetwork)

NodeManager constructs and initializes the Node Manager.

Parameters:

newNetwork - - the host bayesian network for which the manager works.

Method Detail

openEvidenceFile

public boolean openEvidenceFile(java.lang.String fileName)

openEvidenceFile opens an evidence file, reads the structure of the file, and initializes the node manager layout. Node ordering in the evidence file need not match the order of the bayesian network, because the manager will do the matching. Throws BBNE_IOError if the file couldn't be opened or if the file does not match the standard evidence file layout.

Parameters:

fileName - - the name of the evidence file to open

Returns:

boolean - whether or not the open call succeeded.

getEvidenceValues

public java.util.Vector getEvidenceValues()

getEvidenceValues returns the instantiation of nodes in the evidence file

Returns:

Vector - the instantiation of nodes

getNodeNames

public java.util.Vector getNodeNames()

getEvidenceBits

public java.util.Vector getEvidenceBits()

getEvidenceNodeNames

public java.util.Vector getEvidenceNodeNames()

setNetwork

public void setNetwork(BBN network)

setEvidenceBitvector

public void setEvidenceBitvector(java.util.Vector bits)

Parameters:

bits - - a vector of Integer objects - 0 or 1.

getNetwork

public BBN getNetwork()

loadEvidenceAtLine

public void loadEvidenceAtLine(int i)

loadEvidenceAtLine loads the instantiation from the evidence file at the given line

Parameters:

i - - the line in the evidence file to load

hasMoreLines

public boolean hasMoreLines()

hasMoreLines determines if there is another state set to read.

Returns:

boolean - whether or not there is another line.

resetValues

public void resetValues()

readNextValues

public boolean readNextValues()

readNextValues reads the next state set from the file.

isEvidence

public boolean isEvidence(Node node)

isEvidence returns true if the requested node is an evidence. Throws BBNE_NodeNotFound if the requested node is not in the network.

Parameters:

node - - the node being queried

Returns:

boolean - whether the requested node is an evidence node.

isEvidence

public boolean isEvidence(int index)

isEvidence returns true if the requested node index is an evidence. Throws BBNE_OutOfBounds if the requested index is out of bounds.

Parameters:

index - - the index being queried

Returns:

boolean - whether the requested node index is an evidence node.

isEvidence

public boolean isEvidence(java.lang.String nodeName)

isEvidence returns true if the requested node name is an evidence. Throws BBNE_NodeNotFound if the requested node is not in the network.

Parameters:

nodeName - - the node being queried

Returns:

boolean - whether the requested node is an evidence node.

getValue

public int getValue(int index)

getValue returns the requested node's current state. Throws BBNE_OutOfBounds if the requested index is out of bounds.

Parameters:

index - - the node index being queried

Returns:

int - the node's current state

getValue

public int getValue(java.lang.String nodeName)

getValue returns the requested node's current state. Throws BBNE_NodeNotFound if the requested node is not in the network.

Parameters:

nodeName - - the node being queried

Returns:

int - the node's current state

getValue

public int getValue(Node node)

getValue returns the requested node's current state. Throws BBNE_NodeNotFound if the requested node is not in the network.

Parameters:

nodeName - - the node being queried

Returns:

int - the node's current state

setValue

public void setValue(Node node,
                     int newState)

setValue

public void setValue(int node,
                     int newState)

setValues

public void setValues(java.util.Vector newStates)

Sets node states to the given values.

Parameters:

newStates - - the new states being set.

getQueryNodeNames

public java.util.Vector getQueryNodeNames()

getQueryNodeNames return a vector of Strings containing all of the names of nodes that are query nodes.

Returns:

Vector - the vector of query Node names.

getQueryNodes

public java.util.Vector getQueryNodes()

getQueryNodes returns a vector of Node objects containing all of the nodes that are query nodes.

Returns:

Vector - the vector of query Node objects.

getEvidenceNodes

public java.util.Vector getEvidenceNodes()

getEvidenceNodes returns a vector of Node objects containing all of the nodes that are evidence nodes.

Returns:

Vector - the vector of evidence Node objects.

getProbabilityOfNodeGivenParents

public double getProbabilityOfNodeGivenParents(Node node)

getProbabilityOfNodeGivenParents returns the probability of a certain node given the state of its parents. This is a potentially recursive call. Evidence nodes return 1.0 and do not check their parents.

Parameters:

node - - the node being queried.

Returns:

double - the probability of the node's state given its parents' states.

getProbabilityOfNodeGivenParents

public double getProbabilityOfNodeGivenParents(Node node,
                                               boolean ignoreEvidence)

getStateSetProbability

public double getStateSetProbability()

getStateSetProbability returns the probability of an instantiation by using the chain rule.

Returns:

double - the final probability

getEvidenceSetProbability

public double getEvidenceSetProbability()

getStateSetProbability returns the probability of an instantiation by using the chain rule.

Returns:

double - the final probability

report

public java.lang.String report()

reportProbabilities

public java.lang.String reportProbabilities()

reportSimpleValues

public java.lang.String reportSimpleValues()

reportSimpleVector

public java.util.Vector reportSimpleVector()

setAttributeValue

public void setAttributeValue(int nodeIndex,
                              int attributeIndex,
                              java.lang.Double value)

getAttributeValue

public double getAttributeValue(int nodeIndex,
                                int attributeIndex)

getNodePercenteges

public java.util.Vector getNodePercenteges()