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/*
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see .
 */

package weka.classifiers.neural.common.learning;

/**
 * Date: 25/05/2004
 * File: InverseLearningRate.java
 *
 * @author Jason Brownlee
 */
public class InverseLearningRate extends LearningRateKernel {

  private final static double INV_ALPHA_CONSTANT = 100.0;

  public InverseLearningRate(double aLearningRate, int aTotalIterations) {
    super(aLearningRate, aTotalIterations);
  }

  public double currentLearningRate(int aCurrentIteration) {
    double c = (double) totalIterations / INV_ALPHA_CONSTANT;
    double currentRate = (initialLearningRate * c / (c + (double) aCurrentIteration));
    return currentRate;
  }
}