20198569605

Committed 13 Dec 2025 10:10PM UTC coverage: 94.914% (+0.4%) from 94.471%

Build # 20198569605

Build Type

Pull #153

github

Committed by

web-flow

Commit Message

Merge 6a71fc929 into 879958926

Pull Request Pull Request #153: Implementation for learning MMLTs, new model for collecting statistics

Run Details

1823 of 1873 new or added lines in 77 files covered. (97.33%)

1 existing line in 1 file now uncovered.

14258 of 15022 relevant lines covered (94.91%)

1.73 hits per line

Source File
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93.33

/filters/symbol-filters/src/main/java/de/learnlib/filter/symbol/AbstractRandomSymbolFilter.java

/* Copyright (C) 2013-2025 TU Dortmund University
 * This file is part of LearnLib <https://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.filter.symbol;

import java.util.Random;

import de.learnlib.filter.FilterResponse;
import de.learnlib.filter.SymbolFilter;
import net.automatalib.word.Word;

/**
 * A symbol filter that falsely answers a query with a specified probability.
 *
 * @param <U>
 *         input symbol type of the prefix
 * @param <V>
 *         input symbol type of the transition label
 */
public abstract class AbstractRandomSymbolFilter<U, V> extends AbstractTruthfulSymbolFilter<U, V> implements SymbolFilter<U, V> {

    private final double inaccurateProb;
    private final Random random;

    public AbstractRandomSymbolFilter(double inaccurateProb, Random random) {
        this(inaccurateProb, random, valideProbability(inaccurateProb));
    }

    // utility constructor to prevent finalizer attacks, see SEI CERT Rule OBJ-11
    @SuppressWarnings("PMD.UnusedFormalParameter")
    private AbstractRandomSymbolFilter(double inaccurateProb, Random random, boolean validated) {
        this.inaccurateProb = inaccurateProb;
        this.random = random;
    }

    private static boolean valideProbability(double inaccurateProb) {
        if (inaccurateProb > 1 || inaccurateProb < 0) {
            throw new IllegalArgumentException("Ratios must be between zero and 1 (inclusive).");
        }
        return true;
    }

    @Override
    public FilterResponse query(Word<U> prefix, V symbol) {
        boolean ignorable = isIgnorable(prefix, symbol) == FilterResponse.IGNORE;

        // Randomly misclassify:
        if (this.random.nextDouble() <= this.inaccurateProb) {
            ignorable = !ignorable;
        }

        if (ignorable) {
            return FilterResponse.IGNORE;
        } else {
            return FilterResponse.ACCEPT;
        }
    }
}

1	/* Copyright (C) 2013-2025 TU Dortmund University
2	* This file is part of LearnLib <https://learnlib.de>.
3	*
4	* Licensed under the Apache License, Version 2.0 (the "License");
5	* you may not use this file except in compliance with the License.
6	* You may obtain a copy of the License at
7	*
8	* http://www.apache.org/licenses/LICENSE-2.0
9	*
10	* Unless required by applicable law or agreed to in writing, software
11	* distributed under the License is distributed on an "AS IS" BASIS,
12	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13	* See the License for the specific language governing permissions and
14	* limitations under the License.
15	*/
16	package de.learnlib.filter.symbol;
17
18	import java.util.Random;
19
20	import de.learnlib.filter.FilterResponse;
21	import de.learnlib.filter.SymbolFilter;
22	import net.automatalib.word.Word;
23
24	/**
25	* A symbol filter that falsely answers a query with a specified probability.
26	*
27	* @param <U>
28	* input symbol type of the prefix
29	* @param <V>
30	* input symbol type of the transition label
31	*/
32	public abstract class AbstractRandomSymbolFilter<U, V> extends AbstractTruthfulSymbolFilter<U, V> implements SymbolFilter<U, V> {
33
34	private final double inaccurateProb;
35	private final Random random;
36
37	public AbstractRandomSymbolFilter(double inaccurateProb, Random random) {
38	this(inaccurateProb, random, valideProbability(inaccurateProb));	1✔
39	}	1✔
40
41	// utility constructor to prevent finalizer attacks, see SEI CERT Rule OBJ-11
42	@SuppressWarnings("PMD.UnusedFormalParameter")
43	private AbstractRandomSymbolFilter(double inaccurateProb, Random random, boolean validated) {	1✔
44	this.inaccurateProb = inaccurateProb;	1✔
45	this.random = random;	1✔
46	}	1✔
47
48	private static boolean valideProbability(double inaccurateProb) {
49	if (inaccurateProb > 1 \|\| inaccurateProb < 0) {	1✔
NEW 50	throw new IllegalArgumentException("Ratios must be between zero and 1 (inclusive).");	×
51	}
52	return true;	1✔
53	}
54
55	@Override
56	public FilterResponse query(Word<U> prefix, V symbol) {
57	boolean ignorable = isIgnorable(prefix, symbol) == FilterResponse.IGNORE;	1✔
58
59	// Randomly misclassify:
60	if (this.random.nextDouble() <= this.inaccurateProb) {	1✔
61	ignorable = !ignorable;	1✔
62	}
63
64	if (ignorable) {	1✔
65	return FilterResponse.IGNORE;	1✔
66	} else {
67	return FilterResponse.ACCEPT;	1✔
68	}
69	}
70	}

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