/*
* Encog(tm) Core v3.3 - Java Version
* http://www.heatonresearch.com/encog/
* https://github.com/encog/encog-java-core
* Copyright 2008-2014 Heaton Research, Inc.
*
* 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.
*
* For more information on Heaton Research copyrights, licenses
* and trademarks visit:
* http://www.heatonresearch.com/copyright
*/
package org.encog.mathutil.randomize;
import org.encog.mathutil.randomize.generate.LinearCongruentialRandom;
import org.encog.neural.networks.BasicNetwork;
/**
* A randomizer that takes a seed and will always produce consistent results.
*/
public class ConsistentRandomizer extends BasicRandomizer {
/**
* The generator.
*/
private LinearCongruentialRandom rand;
/**
* The minimum value for the random range.
*/
private final double min;
/**
* The maximum value for the random range.
*/
private final double max;
/**
* The seed.
*/
private final int seed;
/**
* Construct a range randomizer.
*
* @param min
* The minimum random value.
* @param max
* The maximum random value.
*/
public ConsistentRandomizer(final double min, final double max) {
this(min, max, 1000);
}
/**
* Construct a range randomizer.
*
* @param min
* The minimum random value.
* @param max
* The maximum random value.
* @param seed The seed value.
*/
public ConsistentRandomizer(final double min, final double max,
final int seed) {
this.max = max;
this.min = min;
this.seed = seed;
this.rand = new LinearCongruentialRandom(seed);
}
/**
* Generate a random number based on the range specified in the constructor.
*
* @param d
* The range randomizer ignores this value.
* @return The random number.
*/
public double randomize(final double d) {
return this.rand.nextDouble(this.min, this.max);
}
/**
* Randomize the network.
* @param network The network to randomize.
*/
public void randomize(final BasicNetwork network) {
this.rand = new LinearCongruentialRandom(seed);
super.randomize(network);
}
}