com.expleague.ml.loss.L2GreedyTDRegion Maven / Gradle / Ivy
package com.expleague.ml.loss;
import com.expleague.commons.math.vectors.Vec;
import com.expleague.ml.data.set.DataSet;
import static com.expleague.commons.math.MathTools.sqr;
/**
* User: solar
* Date: 21.12.2010
* Time: 22:37:55
*/
public class L2GreedyTDRegion extends L2 {
public L2GreedyTDRegion(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) *sqr(stats.weight / (stats.weight - 1))
: 0;
}
}
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