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This artifact provides the implementation of the L* learning algorithm described in the paper "Learning Regular
Sets from Queries and Counterexamples" (https://doi.org/10.1016/0890-5401(87)90052-6) by Dana Angluin including
variations and optimizations thereof such as the versions based on "On the Learnability of Infinitary Regular
Sets" (https://dx.doi.org/10.1006/inco.1995.1070) by Oded Maler and Amir Pnueli or "Inference of finite automata
using homing sequences" (http://dx.doi.org/10.1006/inco.1993.1021) by Ronald L. Rivest and Robert E. Schapire.
/* Copyright (C) 2013-2018 TU Dortmund
* This file is part of LearnLib, http://www.learnlib.de/.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package de.learnlib.algorithms.lstar.closing;
import java.util.List;
import de.learnlib.api.oracle.MembershipOracle;
import de.learnlib.datastructure.observationtable.ObservationTable;
import de.learnlib.datastructure.observationtable.Row;
/**
* A closing strategy, determining how to proceed when an observation table needs to be closed.
*
* @param
* type variable for input symbol upper bound.
* @param
* type variable for output symbol upper bound.
*
* @author Malte Isberner
*/
public interface ClosingStrategy {
/**
* Given a list of row equivalence classes, this method selects for each of the classes one (representative) row
* which is being closed. This corresponds to selecting one of several long prefixes (i.e., transitions reaching an
* unknown state) to be an access sequence.
*
* By contract, the size of the the returned list must equal the size of the {@code unclosedClasses}
* argument.
*
* @param unclosedClasses
* the list of row equivalence classes
* @param table
* the observation table
* @param oracle
* the membership oracle
*
* @return a selection of representative rows to be closed.
*/
List> selectClosingRows(List>> unclosedClasses,
ObservationTable table,
MembershipOracle oracle);
}