ontology.java

一个很好的LIBSVM的JAVA源码。对于要研究和改进SVM算法的学者。可以参考。来自数据挖掘工具YALE工具包。

/*
 *  YALE - Yet Another Learning Environment
 *  Copyright (C) 2001-2004
 *      Simon Fischer, Ralf Klinkenberg, Ingo Mierswa, 
 *          Katharina Morik, Oliver Ritthoff
 *      Artificial Intelligence Unit
 *      Computer Science Department
 *      University of Dortmund
 *      44221 Dortmund,  Germany
 *  email: [e-mail]
 *  web:   http://yale.cs.uni-dortmund.de/
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 *  USA.
 */
package edu.udo.cs.yale.tools;

/** Very simple ontology class. Two static ontologies are available:
 *  <tt>ATTRIBUTE_BLOCK_TYPE</tt> and <tt>ATTRIBUTE_VALUE_TYPE</tt>.
 *  It provides a single method <tt>boolean isA(int sub, int super)</tt> which
 *  does what isA-methods are usually expected to do. Legal parameters are
 *  the constants.
 *  @version $Id: Ontology.java,v 2.6 2004/08/27 11:57:45 ingomierswa Exp $
 */
public class Ontology {

    public static final int VALUE_TYPE = 0;
    public static final int BLOCK_TYPE = 1;


    /** The parent's index in the array. Root has parent -1. 
     */
    private int parentId[];

    /** Human readable string representations. */
    private String names[];

    public static final int NO_PARENT   = -1;

    // -------------------- VALUE TYPE --------------------

    public static final int ATTRIBUTE_VALUE = 0; 
    public static final int NOMINAL         = 1; 
    public static final int NUMERICAL       = 2; 
    public static final int INTEGER         = 3;  
    public static final int REAL            = 4;
    public static final int ORDERED         = 5;
    public static final int CLUSTER         = 6;
    public static final int CLASSIFICATION  = 7; // nominal, only +1 and -1
    public static final int BOOLEAN         = 8;  
    public static final int FILE_PATH       = 9; // path to a file

    private static final String[] VALUE_TYPE_NAMES = 
    { "attribute_value", 
      "nominal", "numeric", 
      "integer", "real", 
      "ordered", "cluster", "classification", "boolean", "file_path" };


    /** An ontology for value types (nominal, numerical...) */
    public static final Ontology ATTRIBUTE_VALUE_TYPE = 
	new Ontology(new int[] {
			 NO_PARENT,
			 ATTRIBUTE_VALUE, ATTRIBUTE_VALUE,
			 NUMERICAL, NUMERICAL,
			 NOMINAL, NOMINAL, NOMINAL, NOMINAL, NOMINAL},
		     VALUE_TYPE_NAMES);


    // -------------------- BLOCK TYPE --------------------

    public static final int ATTRIBUTE_BLOCK    = 0;
    public static final int VALUE_SERIES       = 1; 
    public static final int NON_SERIES         = 2; 
    public static final int SINGLE_VALUE       = 3; 
    public static final int INTERVAL           = 4;
    public static final int X                  = 5;
    public static final int Y                  = 6;
    public static final int VALUE_SERIES_START = 7; 
    public static final int VALUE_SERIES_END   = 8;
    public static final int INTERVAL_START     = 9; 
    public static final int INTERVAL_END       = 10; 

    private static final String[] BLOCK_TYPE_NAMES = { 
	"attribute_block", "value_series", "non_series", "single_value", "interval", "x", "y", 
	"value_series_start", "value_series_end", "interval_start", "interval_end" };

    /** An ontology for block types (single, time series...) */
    public static final Ontology ATTRIBUTE_BLOCK_TYPE = 
	new Ontology(
		     new int[] {
			 NO_PARENT,
			 ATTRIBUTE_BLOCK, ATTRIBUTE_BLOCK, 
			 NON_SERIES, NON_SERIES, 
			 SINGLE_VALUE, SINGLE_VALUE,
			 VALUE_SERIES, VALUE_SERIES,
			 INTERVAL, INTERVAL },
		     BLOCK_TYPE_NAMES);
    

    /** Constructs a new ontology where each of the entries points to its parent. */
    private Ontology(int[] parents, String[] names) {
	this.parentId = parents;
	this.names    = names;
    }

    /** Returns true if child is a parent. */
    public boolean isA(int child, int parent) {
	while (child != parent) {
	    child = parentId[child];
	    if (child == -1) return false;
	}
	return true;
    }

    
    /** Maps the name of a class to its index or -1 if unknown. */
    public int mapName(String name) {
	for (int i = 0 ; i < names.length; i++) {
	    if (names[i].equals(name)) return i;
	}
	return -1;
    }

    /** Maps an index to its name. */
    public String mapIndex(int index) {
	if ((index >= 0) && (index < names.length)) return names[index];
	else return null;
    }

    public String[] getNames() {
	return names;
    }
}