com.expleague.ml.loss.multilabel.MultiLabelMicroFScore Maven / Gradle / Ivy
package com.expleague.ml.loss.multilabel;
import com.expleague.commons.math.vectors.Mx;
import com.expleague.commons.math.vectors.Vec;
import com.expleague.commons.math.vectors.VecTools;
import com.expleague.commons.math.Func;
import com.expleague.ml.data.set.DataSet;
/**
* User: qdeee
* Date: 20.03.15
*
* expected {0,1} data
*/
public class MultiLabelMicroFScore extends Func.Stub implements ClassicMultiLabelLoss {
private final Mx targets;
public MultiLabelMicroFScore(final Mx targets) {
this.targets = targets;
}
@Override
public Mx getTargets() {
return targets;
}
@Override
public double value(final Vec x) {
final Mx predictMx = (Mx) x;
final double v = VecTools.sum(targets) + VecTools.sum(predictMx);
if (v <= 0)
return 0;
return 2 * VecTools.multiply(targets, predictMx) / v;
}
@Override
public int dim() {
return targets.dim();
}
@Override
public DataSet> owner() {
return null;
}
}
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