net.sf.tweety.commons

Class BeliefBaseSampler<S extends BeliefBase>

java.lang.Object

net.sf.tweety.commons.BeliefBaseSampler<S>

Type Parameters:

S - The type of belief bases sampled

public abstract class BeliefBaseSampler<S extends BeliefBase>
extends Object

This abstract class models a sampler for belief bases. It comprises of a set of sample methods which generates some random belief bases wrt. to a given signature.

Author:

Matthias Thimm

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_MAXIMUM_BELIEFBASE_LENGTH This constant specifies the default maximum length for sampled belief bases.
static int	DEFAULT_MINIMUM_BELIEFBASE_LENGTH This constant specifies the default minimum length for sampled belief bases.

Constructor Summary

Constructors

Constructor and Description
BeliefBaseSampler(Signature signature) Creates a new belief base sampler for the given signature.

Method Summary

Modifier and Type	Method and Description
Signature	getSignature() Returns the signature of this sampler.
S	randomSample() This method randomly samples a single belief base of the given signature with the default maximum belief base length.
abstract S	randomSample(int minLength, int maxLength) This method randomly samples a single belief base of the given signature with the given belief base length.
Collection<S>	randomSample(int minLength, int maxLength, int numBeliefBases) This method randomly samples a total of "numBeliefBases" of the given signature and maximum belief base length.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_MAXIMUM_BELIEFBASE_LENGTH

public static final int DEFAULT_MAXIMUM_BELIEFBASE_LENGTH

This constant specifies the default maximum length for sampled belief bases. The interpretation of this int depends on the actual type of knowledge representation but should resemble the maximum number of formulas in the belief base;

See Also:

Constant Field Values

DEFAULT_MINIMUM_BELIEFBASE_LENGTH

public static final int DEFAULT_MINIMUM_BELIEFBASE_LENGTH

This constant specifies the default minimum length for sampled belief bases. The interpretation of this int depends on the actual type of knowledge representation but should resemble the minimum number of formulas in the belief base;

See Also:

Constant Field Values

Constructor Detail

BeliefBaseSampler

public BeliefBaseSampler(Signature signature)

Creates a new belief base sampler for the given signature.

Parameters:

signature - a signature.

Method Detail

randomSample

public abstract S randomSample(int minLength,
                               int maxLength)

This method randomly samples a single belief base of the given signature with the given belief base length.

Parameters:

minLength - the minimum length of the belief base.

maxLength - the maximum length of the belief base.

Returns:

a single belief base.

randomSample

public S randomSample()

This method randomly samples a single belief base of the given signature with the default maximum belief base length.

Returns:

a single belief base.

randomSample

public Collection<S> randomSample(int minLength,
                                  int maxLength,
                                  int numBeliefBases)

This method randomly samples a total of "numBeliefBases" of the given signature and maximum belief base length.

Parameters:

minLength - the minimum length of the belief base.

maxLength - the maximum length of the belief base.

numBeliefBases - the number of belief bases to be sampled.

Returns:

a set of belief bases.

getSignature

public Signature getSignature()

Returns the signature of this sampler.

Returns:

the signature of this sampler.