java weka stringtowordvector未正确计算单词出现次数 [英] java weka stringtowordvector is not counting word occurences properly

问题描述

所以我使用的是Weka机器学习库的JAVA API，并且我有以下代码:

so I'm using Weka Machine Learning Library's JAVA API and I have the following code:

    String html = "repeat repeat repeat";

    Attribute input = new Attribute("html",(FastVector) null);

    FastVector inputVec = new FastVector();
    inputVec.addElement(input);

    Instances htmlInst = new Instances("html",inputVec,1);
    htmlInst.add(new Instance(1));  
    htmlInst.instance(0).setValue(0, html);

    StringToWordVector filter = new StringToWordVector();
    filter.setUseStoplist(true);

    filter.setInputFormat(htmlInst);
    Instances dataFiltered = Filter.useFilter(htmlInst, filter);

    Instance last = dataFiltered.lastInstance();
    System.out.println(last);

尽管StringToWordVector应该对字符串中出现的单词进行计数，而不是对"repeat"一词进行3次计数，但计数结果仅为1

though StringToWordVector is supposed to count the word occurences within the string, instead of having the word 'repeat' counted 3 times, the count only comes out as 1

我在做什么错?

推荐答案

Gee ...所有这些代码行.那几行呢?

Gee... all those lines of code. How about these few lines instead?

public static Map<String, Integer> countWords(String input) {
    Map<String, Integer> map = new HashMap<String, Integer>();
    Matcher matcher = Pattern.compile("\\b\\w+\\b").matcher(input);
    while (matcher.find())
        map.put(matcher.group(), map.containsKey(matcher.group()) ? map.get(matcher.group()) + 1 : 1);
    return map;
}

这是运行中的代码:

public static void main(String[] args) {
    System.out.println(countWords("sample, repeat sample, of text"));
}

输出:

{of=1, text=1, repeat=1, sample=2}

这篇关于java weka stringtowordvector未正确计算单词出现次数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！