com.expleague.ml.loss.LOOL2 Maven / Gradle / Ivy
package com.expleague.ml.loss;
import com.expleague.commons.math.MathTools;
import com.expleague.commons.math.vectors.Vec;
import com.expleague.ml.data.set.DataSet;
/**
* User: solar
* Date: 21.12.2010
* Time: 22:37:55
*/
public class LOOL2 extends L2 {
public LOOL2(final Vec target, final DataSet base) {
super(target, base);
}
@Override
public double value(final MSEStats stats) {
return stats.weight > 1 ? stats.sum/stats.weight : 0;
}
@Override
public double score(final MSEStats stats) {
return stats.weight > 1 ? (- stats.sum * stats.sum / stats.weight) * MathTools.sqr(stats.weight / (stats.weight - 1.)) : 0;
}
}