org.chocosolver.util.objects.MapVal Maven / Gradle / Ivy
Show all versions of choco-solver Show documentation
/*
* This file is part of choco-solver, http://choco-solver.org/
*
* Copyright (c) 2020, IMT Atlantique. All rights reserved.
*
* Licensed under the BSD 4-clause license.
*
* See LICENSE file in the project root for full license information.
*/
package org.chocosolver.util.objects;
import gnu.trove.map.hash.TIntDoubleHashMap;
/**
*
*
* Project: choco-solver.
* @author Charles Prud'homme
* @since 30/10/2018.
*/
public class MapVal implements IVal {
private final TIntDoubleHashMap Av;
private final TIntDoubleHashMap mAv;
private final int os; // offset
public MapVal(int os) {
this.os = os;
this.Av = new TIntDoubleHashMap(32, 0.5f, 0, 0);
this.mAv = new TIntDoubleHashMap(32, 0.5f, 0, 0);
}
@Override
public double activity(int value) {
return Av.get(value - os);
}
@Override
public void setactivity(int value, double activity) {
Av.put(value - os, activity);
}
@Override
public void update(int nb_probes) {
double activity, oldmA, U;
for (int k : Av.keys()) {
activity = Av.get(k);
oldmA = mAv.get(k);
U = activity - oldmA;
mAv.adjustValue(k, U / nb_probes);
}
}
@Override
public void transfer() {
Av.clear();
Av.putAll(mAv);
}
}