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Java example source code file (ConjugateGradientFormula.java)

This example Java source code file (ConjugateGradientFormula.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.

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Java - Java tags/keywords

conjugategradientformula, deprecated, fletcher_reeves, polak_ribiere

The ConjugateGradientFormula.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.general;

/**
 * Available choices of update formulas for the β parameter
 * in {@link NonLinearConjugateGradientOptimizer}.
 * <p>
 * The β parameter is used to compute the successive conjugate
 * search directions. For non-linear conjugate gradients, there are
 * two formulas to compute β:
 * <ul>
 *   <li>Fletcher-Reeves formula
 *   <li>Polak-Ribière formula
 * </ul>
 * On the one hand, the Fletcher-Reeves formula is guaranteed to converge
 * if the start point is close enough of the optimum whether the
 * Polak-Ribière formula may not converge in rare cases. On the
 * other hand, the Polak-Ribière formula is often faster when it
 * does converge. Polak-Ribière is often used.
 * <p>
 * @see NonLinearConjugateGradientOptimizer
 * @deprecated As of 3.1 (to be removed in 4.0).
 * @since 2.0
 */
@Deprecated
public enum ConjugateGradientFormula {

    /** Fletcher-Reeves formula. */
    FLETCHER_REEVES,

    /** Polak-Ribière formula. */
    POLAK_RIBIERE

}

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