forwardpruningcallback.java

一个数据挖掘软件ALPHAMINERR的整个过程的JAVA版源代码

/*
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/**
 * Title: XELOPES Data Mining Library
 * Description: The XELOPES library is an open platform-independent and data-source-independent library for Embedded Data Mining.
 * Copyright: Copyright (c) 2002 Prudential Systems Software GmbH
 * Company: ZSoft (www.zsoft.ru), Prudsys (www.prudsys.com)
 * @author Valentine Stepanenko ([e-mail])
 * @version 1.0
 */
package com.prudsys.pdm.Models.Classification.DecisionTree;

import com.prudsys.pdm.Core.*;
import com.prudsys.pdm.Automat.*;

/**
 * Forward pruning callback for iterative decision trees.
 */
public class ForwardPruningCallback extends RetrospectiveCallback
{
  // -----------------------------------------------------------------------
  //  Constructor
  // -----------------------------------------------------------------------
  /**
   * Empty constructor.
   */
  public ForwardPruningCallback()
  {
  }

  // -----------------------------------------------------------------------
  //  Calculate new parameters
  // -----------------------------------------------------------------------
  /**
   * Forward pruning callback. Does nothing except to set the
   * algorithm into iterative mode and get the algorithm
   * iteration status.
   *
   * @return status of calculation
   * @exception MiningException algorithm is not iterative one
   */
  protected int runParameterCalculation() throws MiningException {

    System.out.println("assessment = " + currentAssessment);

    if ( ! (miningAlgorithm instanceof IterativeMiningAlgorithm) )
      throw new MiningException("Mining algorithm must be iterative.");

    ((IterativeMiningAlgorithm)miningAlgorithm).setIterativeMode(true);

    if ( ! ((IterativeMiningAlgorithm)miningAlgorithm).isIterationImprovement() )
      return CALCULATION_STATUS_NO_IMPROVEMENT;

    return CALCULATION_STATUS_SUCCESSFUL;
  }

}