Stanford Core NLP 示例代码 SemanticGraph 异常

Question

我刚刚试用了核心 NLP 示例代码，作为 StanfordCoreNlpDemo.java 包含在下载中。尝试解析一本书的章节时，语义图抛出异常：

Exception in thread "main" java.lang.NullPointerException
at edu.stanford.nlp.semgraph.SemanticGraph.removeEdge(SemanticGraph.java:122)
at edu.stanford.nlp.trees.UniversalEnglishGrammaticalStructure.expandPPConjunction(UniversalEnglishGrammaticalStructure.java:553)
at edu.stanford.nlp.trees.UniversalEnglishGrammaticalStructure.expandPPConjunctions(UniversalEnglishGrammaticalStructure.java:508)
at edu.stanford.nlp.trees.UniversalEnglishGrammaticalStructure.collapseDependencies(UniversalEnglishGrammaticalStructure.java:807)
at edu.stanford.nlp.trees.GrammaticalStructure.typedDependenciesCollapsed(GrammaticalStructure.java:877)
at edu.stanford.nlp.semgraph.SemanticGraphFactory.makeFromTree(SemanticGraphFactory.java:188)
at edu.stanford.nlp.semgraph.SemanticGraphFactory.generateCollapsedDependencies(SemanticGraphFactory.java:90)
at edu.stanford.nlp.pipeline.ParserAnnotatorUtils.fillInParseAnnotations(ParserAnnotatorUtils.java:51)
at edu.stanford.nlp.pipeline.ParserAnnotator.finishSentence(ParserAnnotator.java:266)
at edu.stanford.nlp.pipeline.ParserAnnotator.doOneSentence(ParserAnnotator.java:245)
at edu.stanford.nlp.pipeline.SentenceAnnotator.annotate(SentenceAnnotator.java:96)
at edu.stanford.nlp.pipeline.AnnotationPipeline.annotate(AnnotationPipeline.java:68)
at edu.stanford.nlp.pipeline.StanfordCoreNLP.annotate(StanfordCoreNLP.java:412)
at epubReader.Test.main(Test.java:68)

我已经将它缩小到一个负责的句子，即使单独分析也是如此：

"Generally speaking, he was a scout, and rarely stood at a watch nearer than the four hundred and fiftieth metre, and then only as a cordon commander."

我遗漏的句子的语法或语义是否有任何特殊之处导致错误？

Answer 1

不，句子没问题，不幸的是，这是我们依赖转换器中的一个错误。

词性标注器输出一个非常奇怪的 POS 序列，导致解析器生成完全错误的解析树，从而导致选区到依赖项转换器中出现此异常。

我修复了转换器中的错误，但除非您从 GitHub 克隆代码并自己编译，否则在下一个版本发布之前这对您没有帮助。

但是您仍然可以通过禁用词性标注器来解析这句话（请参阅 parser FAQ for details on how to do this) or by using the neural network dependency parser。

Stanford Core NLP 示例代码 SemanticGraph 异常

Stanford Core NLP example code SemanticGraph exception

stanford-nlp