/*
Copyright (C) 2010 by
*
* Cam-Tu Nguyen
* ncamtu@ecei.tohoku.ac.jp or ncamtu@gmail.com
*
* Xuan-Hieu Phan
* pxhieu@gmail.com
*
* College of Technology, Vietnamese University, Hanoi
* Graduate School of Information Sciences, Tohoku University
*
* JVnTextPro-v.2.0 is a 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.
*
* JVnTextPro-v.2.0 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 JVnTextPro-v.2.0); if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
package jmaxent;
import java.util.*;
// TODO: Auto-generated Javadoc
/**
* The Class Feature.
*/
public class Feature {
/** The idx. */
public int idx = -1; // feature index
/** The str id. */
public String strId = ""; // string identifier
/** The label. */
public int label = -1; // label
/** The cp. */
public int cp = -1; // context predicate
/** The val. */
public float val = 1; // feature value
/** The wgt. */
public double wgt = 0.0; // feature weight
/**
* Instantiates a new feature.
*/
public Feature() {
}
/**
* Instantiates a new feature.
*
* @param label the label
* @param cp the cp
*/
public Feature(int label, int cp) {
FeatureInit(label, cp);
}
/**
* Instantiates a new feature.
*
* @param label the label
* @param cp the cp
* @param fmap the fmap
*/
public Feature(int label, int cp, Map fmap) {
FeatureInit(label, cp);
strId2IdxAdd(fmap);
}
// create a feature from a string (e.g., reading from model file)
/**
* Instantiates a new feature.
*
* @param str the str
* @param cpStr2Int the cp str2 int
* @param lbStr2Int the lb str2 int
*/
public Feature(String str, Map cpStr2Int, Map lbStr2Int) {
FeatureInit(str, cpStr2Int, lbStr2Int);
}
// create a feature from a string and add it to the feature map
/**
* Instantiates a new feature.
*
* @param str the str
* @param cpStr2Int the cp str2 int
* @param lbStr2Int the lb str2 int
* @param fmap the fmap
*/
public Feature(String str, Map cpStr2Int, Map lbStr2Int, Map fmap) {
FeatureInit(str, cpStr2Int, lbStr2Int);
strId2IdxAdd(fmap);
}
/**
* Feature init.
*
* @param label the label
* @param cp the cp
*/
public void FeatureInit(int label, int cp) {
this.label = label;
this.cp = cp;
strId = Integer.toString(label) + " " + Integer.toString(cp);
}
/**
* Feature init.
*
* @param str the str
* @param cpStr2Int the cp str2 int
* @param lbStr2Int the lb str2 int
*/
public void FeatureInit(String str, Map cpStr2Int, Map lbStr2Int) {
StringTokenizer strTok = new StringTokenizer(str, " \t\r\n");
// <label> <cp> <idx> <wgt>
int len = strTok.countTokens();
if (len != 4) {
return;
}
String labelStr = strTok.nextToken();
String cpStr = strTok.nextToken();
int idx = Integer.parseInt(strTok.nextToken());
float val = 1;
double wgt = Double.parseDouble(strTok.nextToken());
Integer labelInt = (Integer)lbStr2Int.get(labelStr);
Integer cpInt = (Integer)cpStr2Int.get(cpStr);
FeatureInit(labelInt.intValue(), cpInt.intValue());
this.idx = idx;
this.val = val;
this.wgt = wgt;
}
// mapping from string identifier to feature index
/**
* Str id2 idx.
*
* @param fmap the fmap
* @return the int
*/
public int strId2Idx(Map fmap) {
Integer idxInt = (Integer)fmap.get(strId);
if (idxInt != null) {
this.idx = idxInt.intValue();
}
return this.idx;
}
// mapping from string identifier to feature index (adding feature to the map
// if the mapping does not exist
/**
* Str id2 idx add.
*
* @param fmap the fmap
* @return the int
*/
public int strId2IdxAdd(Map fmap) {
strId2Idx(fmap);
if (idx < 0) {
idx = fmap.size();
fmap.put(strId, new Integer(idx));
}
return idx;
}
// return the feature index
/**
* Index.
*
* @param fmap the fmap
* @return the int
*/
public int index(Map fmap) {
return strId2Idx(fmap);
}
// convert feature to string: "<label> <cp> <idx> <weight>"
/**
* To string.
*
* @param cpInt2Str the cp int2 str
* @param lbInt2Str the lb int2 str
* @return the string
*/
public String toString(Map cpInt2Str, Map lbInt2Str) {
String str = "";
String labelStr = (String)lbInt2Str.get(new Integer(label));
if (labelStr != null) {
str += labelStr + " ";
}
String cpStr = (String)cpInt2Str.get(new Integer(cp));
if (cpStr != null) {
str += cpStr + " ";
}
str += Integer.toString(idx) + " " + Double.toString(wgt);
return str;
}
} // end of class Feature