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Java example source code file (ConvergenceChecker.java)

This example Java source code file (ConvergenceChecker.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

convergencechecker, deprecated, pair

The ConvergenceChecker.java Java example source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.commons.math3.optimization;

/**
 * This interface specifies how to check if an optimization algorithm has
 * converged.
 * <br/>
 * Deciding if convergence has been reached is a problem-dependent issue. The
 * user should provide a class implementing this interface to allow the
 * optimization algorithm to stop its search according to the problem at hand.
 * <br/>
 * For convenience, three implementations that fit simple needs are already
 * provided: {@link SimpleValueChecker}, {@link SimpleVectorValueChecker} and
 * {@link SimplePointChecker}. The first two consider that convergence is
 * reached when the objective function value does not change much anymore, it
 * does not use the point set at all.
 * The third one considers that convergence is reached when the input point
 * set does not change much anymore, it does not use objective function value
 * at all.
 *
 * @param <PAIR> Type of the (point, objective value) pair.
 *
 * @see org.apache.commons.math3.optimization.SimplePointChecker
 * @see org.apache.commons.math3.optimization.SimpleValueChecker
 * @see org.apache.commons.math3.optimization.SimpleVectorValueChecker
 *
 * @deprecated As of 3.1 (to be removed in 4.0).
 * @since 3.0
 */
@Deprecated
public interface ConvergenceChecker<PAIR> {
    /**
     * Check if the optimization algorithm has converged.
     *
     * @param iteration Current iteration.
     * @param previous Best point in the previous iteration.
     * @param current Best point in the current iteration.
     * @return {@code true} if the algorithm is considered to have converged.
     */
    boolean converged(int iteration, PAIR previous, PAIR current);
}

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