de.learnlib.oracle.equivalence.mealy

Class RandomWalkEQOracle<I,O>

java.lang.Object

de.learnlib.oracle.equivalence.mealy.RandomWalkEQOracle<I,O>

Type Parameters:

I - input symbol type

O - output symbol type

All Implemented Interfaces:

EquivalenceOracle<net.automatalib.automata.transout.MealyMachine<?,I,?,O>,I,net.automatalib.words.Word<O>>, EquivalenceOracle.MealyEquivalenceOracle<I,O>

public class RandomWalkEQOracle<I,O>
extends Object
implements EquivalenceOracle.MealyEquivalenceOracle<I,O>

Performs a random walk over the hypothesis. A random walk restarts with a fixed probability after every step and terminates after a fixed number of steps or with a counterexample. The number of steps to termination may be reset for every new search.

Author:

falkhowar

Nested Class Summary

Nested classes/interfaces inherited from interface de.learnlib.api.oracle.EquivalenceOracle

EquivalenceOracle.DFAEquivalenceOracle<I>, EquivalenceOracle.MealyEquivalenceOracle<I,O>

Constructor Summary

Constructors

Constructor and Description
RandomWalkEQOracle(SUL<I,O> sul, double restartProbability, long maxSteps, boolean resetStepCount, Random random)
RandomWalkEQOracle(SUL<I,O> sul, double restartProbability, long maxSteps, Random random)

Method Summary

Modifier and Type	Method and Description
DefaultQuery<I,net.automatalib.words.Word<O>>	findCounterExample(net.automatalib.automata.transout.MealyMachine<?,I,?,O> hypothesis, Collection<? extends I> inputs) Searches for a counterexample disproving the subjected hypothesis.

Methods inherited from class java.lang.Object

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

Constructor Detail

RandomWalkEQOracle

public RandomWalkEQOracle(SUL<I,O> sul,
                          double restartProbability,
                          long maxSteps,
                          boolean resetStepCount,
                          Random random)

RandomWalkEQOracle

public RandomWalkEQOracle(SUL<I,O> sul,
                          double restartProbability,
                          long maxSteps,
                          Random random)

Method Detail

findCounterExample

public DefaultQuery<I,net.automatalib.words.Word<O>> findCounterExample(net.automatalib.automata.transout.MealyMachine<?,I,?,O> hypothesis,
                                                                        Collection<? extends I> inputs)

Description copied from interface: EquivalenceOracle

Searches for a counterexample disproving the subjected hypothesis. A counterexample is query which, when performed on the SUL, yields a different output than what was predicted by the hypothesis. If no counterexample could be found (this does not necessarily mean that none exists), null is returned.

Specified by:

findCounterExample in interface EquivalenceOracle<net.automatalib.automata.transout.MealyMachine<?,I,?,O>,I,net.automatalib.words.Word<O>>

Parameters:

hypothesis - the conjecture

inputs - the set of inputs to consider, this should be a subset of the input alphabet of the provided hypothesis

Returns:

a query exposing different behavior, or null if no counterexample could be found. In case a non-null value is returned, the output field in the DefaultQuery contains the SUL output for the respective query.