/*******************************************************************************
* Copyright 2012 Analog Devices, 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.
********************************************************************************/
package com.analog.lyric.util.test;
import java.util.Random;
import com.analog.lyric.dimple.factorfunctions.core.FactorFunction;
import com.analog.lyric.dimple.model.values.Value;
public class AlwaysTrueUpToNRowsFactorFunction extends FactorFunction
{
private int _maxRows;
private int _currRows;
private boolean _randomWeights;
static private Random _r = new Random();
public AlwaysTrueUpToNRowsFactorFunction(int maxRows, boolean randomWeights)
{
super(String.format("AlwaysTrueUpTo%dRows", maxRows));
_maxRows = maxRows;
_currRows = 0;
_randomWeights = randomWeights;
}
@Override
public final double evalEnergy(Value[] input)
{
double value = _randomWeights ? -Math.log(_r.nextDouble()) : 0;
if(_currRows < _maxRows)
{
_currRows++;
}
else
{
value = Double.POSITIVE_INFINITY;
}
return value;
}
}