/*******************************************************************************
* 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.dimple.factorfunctions;
import com.analog.lyric.dimple.factorfunctions.core.FactorFunction;
import com.analog.lyric.dimple.model.values.Value;
public class AdditiveNoise extends FactorFunction
{
protected double _invSigmaSquared = 1;
public AdditiveNoise(double sigma) {super(); _invSigmaSquared = 1/(sigma*sigma);}
@Override
public final double evalEnergy(Value[] arguments)
{
final double var1 = arguments[0].getDouble();
final double var2 = arguments[1].getDouble();
final double diff = var2 - var1;
final double potential = diff*diff*_invSigmaSquared/2;
return potential;
}
}