com.expleague.ml.loss.LogL2 Maven / Gradle / Ivy
package com.expleague.ml.loss;
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 LogL2 extends L2 {
public LogL2(final Vec target, final DataSet base) {
super(target, base);
}
@Override
public double value(final Stat stats) {
return stats.weight >= 1 ? stats.sum/stats.weight : 0;
}
@Override
public double score(final Stat stats) {
return stats.weight > 1 ? (- stats.sum * stats.sum / stats.weight) * Math.log(stats.weight + 1) : 0;
}
}