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ASEvaluation.java
Package: Weka-3-2.rar [view]
Upload User: rhdiban
Upload Date: 2013-08-09
Package Size: 15085k
Code Size: 4k
Category:
Windows Develop
Development Platform:
Java
- /*
- * 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.
- */
- /*
- * ASEvaluation.java
- * Copyright (C) 1999 Mark Hall
- *
- */
- package weka.attributeSelection;
- import java.io.Serializable;
- import weka.core.Instance;
- import weka.core.Instances;
- import weka.core.SerializedObject;
- import weka.core.Utils;
- /**
- * Abstract attribute selection evaluation class
- *
- * @author Mark Hall (mhall@cs.waikato.ac.nz)
- * @version $Revision: 1.8 $
- */
- public abstract class ASEvaluation implements Serializable {
- // ===============
- // Public methods.
- // ===============
- /**
- * Generates a attribute evaluator. Has to initialize all fields of the
- * evaluator that are not being set via options.
- *
- * @param data set of instances serving as training data
- * @exception Exception if the evaluator has not been
- * generated successfully
- */
- public abstract void buildEvaluator(Instances data) throws Exception;
- /**
- * Provides a chance for a attribute evaluator to do any special
- * post processing of the selected attribute set.
- *
- * @param attributeSet the set of attributes found by the search
- * @return a possibly ranked list of postprocessed attributes
- * @exception Exception if postprocessing fails for some reason
- */
- public int [] postProcess(int [] attributeSet)
- throws Exception
- {
- return attributeSet;
- }
- /**
- * Creates a new instance of an attribute/subset evaluator
- * given it's class name and
- * (optional) arguments to pass to it's setOptions method. If the
- * evaluator implements OptionHandler and the options parameter is
- * non-null, the evaluator will have it's options set.
- *
- * @param evaluatorName the fully qualified class name of the evaluator
- * @param options an array of options suitable for passing to setOptions. May
- * be null.
- * @return the newly created evaluator, ready for use.
- * @exception Exception if the evaluator name is invalid, or the options
- * supplied are not acceptable to the evaluator
- */
- public static ASEvaluation forName(String evaluatorName,
- String [] options) throws Exception
- {
- return (ASEvaluation)Utils.forName(ASEvaluation.class,
- evaluatorName,
- options);
- }
- /**
- * Creates copies of the current evaluator. Note that this method
- * now uses Serialization to perform a deep copy, so the evaluator
- * object must be fully Serializable. Any currently built model will
- * now be copied as well.
- *
- * @param model an example evaluator to copy
- * @param num the number of evaluator copies to create.
- * @return an array of evaluators.
- * @exception Exception if an error occurs
- */
- public static ASEvaluation [] makeCopies(ASEvaluation model,
- int num) throws Exception {
- if (model == null) {
- throw new Exception("No model evaluator set");
- }
- ASEvaluation [] evaluators = new ASEvaluation [num];
- SerializedObject so = new SerializedObject(model);
- for(int i = 0; i < evaluators.length; i++) {
- evaluators[i] = (ASEvaluation) so.getObject();
- }
- return evaluators;
- }
- }