nrc.fuzzy
Interface FuzzyRuleExecutorInterface

All Known Implementing Classes:

FuzzyRuleExecutor

public interface FuzzyRuleExecutorInterface

An interface for classes that provides an execute method to execute (fire) FuzzyRules. The execute method will accept a FuzzyRule object and return a FuzzyValueVector composed of the actual output FuzzyValues for the rule (using the implication operator and composition operator that the specific interface implements). All FuzzyRules have a FuzzyRuleExecutor associated with them. This defines the method (algorithm) that will be used for calculating the output FuzzyValues of a rule, given the antecedents, inputs and conclusions in the FuzzyRule. In general each FuzzyRule should have a unique instance of a FuzzyRuleExecutor associated with it. This will allow the Rule Executors to save state between firings of the same rule and when possible avoid redoing some calculations, after testing that the rule contents (antecedents, inputs, and conclusions) have not changed enough to invalidate previous calculations. For example, the MamdaniMinMaxMinRuleExecutor implements the Mamdani Min inference operator and the Max-Min composition operator to calculate a rule's outputs. This method has the rather nice property that the outputs are generated from the conclusions by 'clipping' them at a value that is calculated as the minimum of the maximum membership values of the intersections of the fuzzy value antecedent and input pairs. So one can calculate the intersections of the pairs get the maximum membership value for each intersection and find the minimum of these. Should the rule be fired a second time and the antecedents and inputs have not changed, it is only necessary to clip the consequents, avoiding some expensive calculations.

See Also:

MamdaniMinMaxMinRuleExecutor, LarsenProductMaxMinRuleExecutor, FuzzyRuleExecutor, FuzzyRule

Method Summary

nrc.fuzzy.FuzzyValueVector

execute(nrc.fuzzy.FuzzyRule fuzzyRule) Classes that implement the FuzzyRuleExecutorInterface must provide an execute method that accepts a FuzzyRule object and return a FuzzyValueVector composed of the actual output FuzzyValues for the rule (using the implication operator and composition operator that the specific interface implements).

nrc.fuzzy.FuzzyValueVector

execute(nrc.fuzzy.FuzzyValueVector antecedents, nrc.fuzzy.FuzzyValueVector conclusions, nrc.fuzzy.FuzzyValueVector inputs) Classes that implement the FuzzyRuleExecutor interface must provide an execute method that accepts 3 FuzzyValueVector objects and return a FuzzyValueVector composed of the actual output FuzzyValues for the rule (using the implication operator and composition operator that the specific interface implements).

Method Detail

execute

public nrc.fuzzy.FuzzyValueVector execute(nrc.fuzzy.FuzzyRule fuzzyRule)
                                   throws IncompatibleRuleInputsException

Classes that implement the FuzzyRuleExecutorInterface must provide an execute method that accepts a FuzzyRule object and return a FuzzyValueVector composed of the actual output FuzzyValues for the rule (using the implication operator and composition operator that the specific interface implements). For example, the execute method may implement rule execution using the Mamdani Min inference operator and Max-Min composition.

Parameters:

fuzzyRule - the rule that is to be executed (fired)

Returns:

A FuzzyValueVector with the FuzzyValues that represent the outputs of the fired rule.

Throws:

IncompatibleRuleInputsException

execute

public nrc.fuzzy.FuzzyValueVector execute(nrc.fuzzy.FuzzyValueVector antecedents,
                                          nrc.fuzzy.FuzzyValueVector conclusions,
                                          nrc.fuzzy.FuzzyValueVector inputs)
                                   throws IncompatibleRuleInputsException

Classes that implement the FuzzyRuleExecutor interface must provide an execute method that accepts 3 FuzzyValueVector objects and return a FuzzyValueVector composed of the actual output FuzzyValues for the rule (using the implication operator and composition operator that the specific interface implements). For example, the execute method may implement rule execution using the Mamdani Min inference operator and Max-Min composition.

Parameters:

antecedents - The FuzzyValues that represent a rule's antecedents.

conclusions - The FuzzyValues that represent a rule's conclusions.

inputs - The FuzzyValues that represent a rule's inputs.

Returns:

A FuzzyValueVector with the FuzzyValues that represent the outputs of the fired rule.

Throws:

IncompatibleRuleInputsException