Package de.learnlib.algorithm.kv.dfa
Class KearnsVaziraniDFA<I>
- java.lang.Object
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- de.learnlib.algorithm.kv.dfa.KearnsVaziraniDFA<I>
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- Type Parameters:
I
- input symbol type
- All Implemented Interfaces:
LearningAlgorithm<DFA<?,I>,I,Boolean>
,LearningAlgorithm.DFALearner<I>
,Resumable<KearnsVaziraniDFAState<I>>
,SupportsGrowingAlphabet<I>
- Direct Known Subclasses:
KearnsVaziraniAdapterDFA
public class KearnsVaziraniDFA<I> extends Object implements LearningAlgorithm.DFALearner<I>, SupportsGrowingAlphabet<I>, Resumable<KearnsVaziraniDFAState<I>>
The Kearns/Vazirani algorithm for learning DFA, as described in the book "An Introduction to Computational Learning Theory" by Michael Kearns and Umesh Vazirani.
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Nested Class Summary
Nested Classes Modifier and Type Class Description protected class
KearnsVaziraniDFA.KVAbstractCounterexample
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Nested classes/interfaces inherited from interface de.learnlib.algorithm.LearningAlgorithm
LearningAlgorithm.DFALearner<I>, LearningAlgorithm.MealyLearner<I,O>, LearningAlgorithm.MooreLearner<I,O>, LearningAlgorithm.NFALearner<I>
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Field Summary
Fields Modifier and Type Field Description protected List<StateInfo<I,Boolean>>
stateInfos
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Constructor Summary
Constructors Constructor Description KearnsVaziraniDFA(Alphabet<I> alphabet, MembershipOracle<I,Boolean> oracle, boolean repeatedCounterexampleEvaluation, AcexAnalyzer counterexampleAnalyzer)
Constructor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
addAlphabetSymbol(I symbol)
BinaryDTree<I,StateInfo<I,Boolean>>
getDiscriminationTree()
DFA<?,I>
getHypothesisModel()
Returns the current hypothesis model.boolean
refineHypothesis(DefaultQuery<I,Boolean> ceQuery)
Triggers a refinement of the model by providing a counterexample.void
resume(KearnsVaziraniDFAState<I> state)
Resume the datastructure from a previously suspended point in time.void
startLearning()
Starts the model inference process, creating an initial hypothesis in the provided model object.KearnsVaziraniDFAState<I>
suspend()
Expose the state object.
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Constructor Detail
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KearnsVaziraniDFA
public KearnsVaziraniDFA(Alphabet<I> alphabet, MembershipOracle<I,Boolean> oracle, boolean repeatedCounterexampleEvaluation, AcexAnalyzer counterexampleAnalyzer)
Constructor.- Parameters:
alphabet
- the learning alphabetoracle
- the membership oracle
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Method Detail
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startLearning
public void startLearning()
Description copied from interface:LearningAlgorithm
Starts the model inference process, creating an initial hypothesis in the provided model object. Please note that it should be illegal to invoke this method twice.- Specified by:
startLearning
in interfaceLearningAlgorithm<DFA<?,I>,I,Boolean>
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refineHypothesis
public boolean refineHypothesis(DefaultQuery<I,Boolean> ceQuery)
Description copied from interface:LearningAlgorithm
Triggers a refinement of the model by providing a counterexample. A counterexample is a query which exposes different behavior of the real SUL compared to the hypothesis. Please note that invoking this method before an initial invocation ofLearningAlgorithm.startLearning()
should be illegal.- Specified by:
refineHypothesis
in interfaceLearningAlgorithm<DFA<?,I>,I,Boolean>
- Parameters:
ceQuery
- the query which exposes diverging behavior, as posed to the real SUL (i.e. with the SULs output).- Returns:
true
if the counterexample triggered a refinement of the hypothesis,false
otherwise (i.e., it was no counterexample).
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getHypothesisModel
public DFA<?,I> getHypothesisModel()
Description copied from interface:LearningAlgorithm
Returns the current hypothesis model.N.B.: By the contract of this interface, the model returned by this method may not be modified (i.e., M generally should refer to an immutable interface), and its validity is retained only until the next invocation of
LearningAlgorithm.refineHypothesis(DefaultQuery)
. If older hypotheses have to be maintained, a copy of the returned model must be made.Please note that it should be illegal to invoke this method before an initial invocation of
LearningAlgorithm.startLearning()
.- Specified by:
getHypothesisModel
in interfaceLearningAlgorithm<DFA<?,I>,I,Boolean>
- Returns:
- the current hypothesis model.
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getDiscriminationTree
public BinaryDTree<I,StateInfo<I,Boolean>> getDiscriminationTree()
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addAlphabetSymbol
public void addAlphabetSymbol(I symbol)
- Specified by:
addAlphabetSymbol
in interfaceSupportsGrowingAlphabet<I>
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suspend
public KearnsVaziraniDFAState<I> suspend()
Description copied from interface:Resumable
Expose the state object.
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