com.expleague.ml.models.ExponentialObliviousTree Maven / Gradle / Ivy
package com.expleague.ml.models;
import com.expleague.commons.math.vectors.Vec;
import com.expleague.ml.BFGrid;
import java.util.List;
/**
* Created with IntelliJ IDEA.
* User: towelenee
* Date: 30.11.13
* Time: 18:03
* Idea please stop making my code yellow
*/
public class ExponentialObliviousTree extends ContinousObliviousTree {
private final double DistCoef;
public ExponentialObliviousTree(final List features, final double[][] values, final double _distCoef) {
super(features, values);
DistCoef = _distCoef;
}
double sqr(final double x) {
return x * x;
}
double calcDistanseToRegion(final int index, final Vec point) {
double ans = 0;
for (int i = 0; i < features.length; i++) {
if (features[i].value(point) != ((index >> i) == 1)) {
ans += sqr(point.get(features[i].findex()) - features[i].condition());//L2
}
}
return DistCoef * ans;
}
@Override
public double value(final Vec _x) {
double sum = 0;
final double[] x = new double[features.length + 1];
for (int i = 0; i < features.length; i++)
x[i + 1] = _x.get(features[i].findex());
x[0] = 1;
final double sumWeights = 0;
//for (int index = 0; index < 1 << lines.length; index++) {
//double weight = Math.exp(-calcDistanseToRegion(index, _x));
//sumWeights += weight;
int index = 0;
for (int j = 0; j < features.length; j++) {
index <<= 1;
if (features[j].value(_x))
index++;
}
for(int i = 0; i < x.length;i++)
for(int j = 0; j <= i; j++)
sum += values[index][i * (i + 1) / 2 + j] * x[i] * x[j];
return sum ;// / sumWeights;
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy