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/*******************************************************************************
 * Copyright (c) 2010 Haifeng Li
 *   
 * Licensed 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 smile.classification;

/**
 * Classifier with online learning capability. Online learning is a model of
 * induction that learns one instance at a time. More formally, an online
 * algorithm proceeds in a sequence of trials.
 * 
 * @param  the type of input object
 * 
 * @author Haifeng Li
 */
public interface OnlineClassifier  extends Classifier  {
    /**
     * Online update the classifier with a new training instance.
     * In general, this method may be NOT multi-thread safe.
     * 
     * @param x training instance.
     * @param y training label.
     */
    public void learn(T x, int y);
}