com.expleague.ml.func.generic.ElementaryFunc Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jmll

Various ML methods implemented by myself and my students

There is a newer version: 1.4.9

package com.expleague.ml.func.generic;

import com.expleague.commons.math.vectors.SingleValueVec;
import com.expleague.commons.math.vectors.Vec;
import com.expleague.commons.math.FuncC1;
import org.jetbrains.annotations.NotNull;

/**
 * User: solar
 * Date: 29.06.15
 * Time: 16:40
 */
public abstract class ElementaryFunc extends FuncC1.Stub {
  public abstract double value(double x);

  @NotNull
  public abstract ElementaryFunc gradient();

  @Override
  public final double value(Vec x) {
    return value(x.get(0));
  }

  @Override
  public final int dim() {
    return 1;
  }

  @Override
  public final Vec gradientTo(Vec x, Vec to) {
    to.set(0, gradient().value(x.get(0)));
    return to;
  }

  @Override
  public final Vec gradient(Vec x) {
    return new SingleValueVec(gradient().value(x.get(0)));
  }
}