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Scalable machine learning libraries

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.mahout.classifier.sgd;

import org.apache.mahout.classifier.AbstractVectorClassifier;
import org.apache.mahout.math.Vector;

/**
 * Provides the ability to inject a gradient into the SGD logistic regresion.
 * Typical uses of this are to use a ranking score such as AUC instead of a
 * normal loss function.
 */
public interface Gradient {
  Vector apply(String groupKey, int actual, Vector instance, AbstractVectorClassifier classifier);
}