content: /*******************************************************************************
   * 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.regression;
  
  /**
   * Regression model 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 <T> the type of input object
   * 
   * @author Haifeng Li
   */
  public interface OnlineRegression <T> extends Regression <T> {
      /**
       * Online update the regression model with a new training instance.
       * In general, this method may be NOT multi-thread safe.
       * 
       * @param x training instance.
       * @param y response variable.
       */
      public void learn(T x, double y);
  }
  