信息增益 java 代码 实现

代码说明：

import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.io.UnsupportedEncodingException;import java.util.*;public class FSInformationGain2 {//private static Map cateToDocs = new HashMap();//词典private static Set words= new HashSet();private static int document_count = 0;//private static Map wordDF = new HashMap();//private static Map categoryWordMap = new  HashMap();public void sc