Stanford Core NLP - 了解共同参与解决方案 [英] Stanford Core NLP - understanding coreference resolution

问题描述

我在理解上一版斯坦福NLP工具中对coref解析器所做的更改时遇到了一些麻烦。
例如，下面是一个句子和相应的CorefChainAnnotation：

I'm having some trouble understanding the changes made to the coref resolver in the last version of the Stanford NLP tools. As an example, below is a sentence and the corresponding CorefChainAnnotation:

The atom is a basic unit of matter, it consists of a dense central nucleus surrounded by a cloud of negatively charged electrons.

{1=[1 1, 1 2], 5=[1 3], 7=[1 4], 9=[1 5]}

我不确定我理解这些数字的含义。查看源代码也没有任何帮助。

I am not sure I understand the meaning of these numbers. Looking at the source doesn't really help either.

谢谢

推荐答案

第一个数字是一个集群ID（代表标记，代表同一个实体），参见 SieveCoreferenceSystem＃coref（Document）的源代码。对数不包括CorefChain＃toString（）：

The first number is a cluster id (representing tokens, which stand for the same entity), see source code of SieveCoreferenceSystem#coref(Document). The pair numbers are outout of CorefChain#toString():

public String toString(){
    return position.toString();
}

其中，position是一组提及实体的位置对（让他们使用） CorefChain.getCorefMentions（））。以下是完整代码的示例（在 groovy 中），其中显示了如何从位置到令牌：

where position is a set of postion pairs of entity mentioning (to get them use CorefChain.getCorefMentions()). Here is an example of a complete code (in groovy), which shows how to get from positions to tokens:

class Example {
    public static void main(String[] args) {
        Properties props = new Properties();
        props.put("annotators", "tokenize, ssplit, pos, lemma, ner, parse, dcoref");
        props.put("dcoref.score", true);
        pipeline = new StanfordCoreNLP(props);
        Annotation document = new Annotation("The atom is a basic unit of matter, it   consists of a dense central nucleus surrounded by a cloud of negatively charged electrons.");

        pipeline.annotate(document);
        Map<Integer, CorefChain> graph = document.get(CorefChainAnnotation.class);

        println aText

        for(Map.Entry<Integer, CorefChain> entry : graph) {
          CorefChain c =   entry.getValue();                
          println "ClusterId: " + entry.getKey();
          CorefMention cm = c.getRepresentativeMention();
          println "Representative Mention: " + aText.subSequence(cm.startIndex, cm.endIndex);

          List<CorefMention> cms = c.getCorefMentions();
          println  "Mentions:  ";
          cms.each { it -> 
              print aText.subSequence(it.startIndex, it.endIndex) + "|"; 
          }         
        }
    }
}

输出（我不明白'''来自哪里）：

Output (I do not understand where 's' comes from):

The atom is a basic unit of matter, it consists of a dense central nucleus surrounded by a cloud of negatively charged electrons.
ClusterId: 1
Representative Mention: he
Mentions: he|atom |s|
ClusterId: 6
Representative Mention:  basic unit 
Mentions:  basic unit |
ClusterId: 8
Representative Mention:  unit 
Mentions:  unit |
ClusterId: 10
Representative Mention: it 
Mentions: it |

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