com.expleague.ml.models.TransObliviousTree Maven / Gradle / Ivy
package com.expleague.ml.models;
import com.expleague.commons.math.Trans;
import com.expleague.commons.math.vectors.Vec;
import com.expleague.ml.BFGrid;
import com.expleague.ml.BinModelWithGrid;
import com.expleague.ml.BinOptimizedModel;
import com.expleague.ml.data.impl.BinarizedDataSet;
import com.expleague.ml.data.set.VecDataSet;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
/**
* User: noxoomo
*/
public class TransObliviousTree extends BinOptimizedModel.Stub implements BinModelWithGrid {
private final BFGrid.Feature[] features;
private final Trans[] values;
private final BFGrid grid;
public TransObliviousTree(final List features, final Trans[] values) {
grid = features.get(0).row().grid();
this.features = features.toArray(new BFGrid.Feature[features.size()]);
this.values = values;
}
@Override
public int dim() {
return grid.rows();
}
@Override
public double value(final Vec x) {
final int index = bin(x);
return values[index].trans(x).get(0);
}
@Override
public String toString() {
final StringBuilder builder = new StringBuilder();
builder.append(values.length);
builder.append("->(");
for (int i = 0; i < features.length; i++) {
builder.append(i > 0 ? ", " : "")
.append(features[i]).append("@");
}
builder.append(")");
builder.append("+[");
for (final Trans feature : values) {
builder.append(feature.toString()).append(", ");
}
builder.delete(builder.length() - 2, builder.length());
builder.append("]");
return builder.toString();
}
public int bin(final Vec x) {
int index = 0;
for (int i = 0; i < features.length; i++) {
index <<= 1;
if (features[i].value(x))
index++;
}
return index;
}
public List features() {
final List ret = new ArrayList();
Collections.addAll(ret, features);
return ret;
}
public Trans[] values() {
return values;
}
@Override
public boolean equals(final Object o) {
if (this == o) return true;
if (!(o instanceof TransObliviousTree)) return false;
final TransObliviousTree that = (TransObliviousTree) o;
return Arrays.equals(features, that.features) && Arrays.equals(values, that.values);
}
@Override
public int hashCode() {
int result = Arrays.hashCode(features);
result = 31 * result + Arrays.hashCode(values);
return result;
}
public BFGrid grid() {
return features[0].row().grid();
}
@Override
public double value(final BinarizedDataSet bds, final int pindex) {
int index = 0;
for (int i = 0; i < features.length; i++) {
index <<= 1;
if (bds.bins(features[i].findex())[pindex] > features[i].bin())
index++;
}
//dirty hack with cast
return values[index].trans(((VecDataSet)bds.original()).data().row(pindex)).get(0);
}
}
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