Stanford NLP Chinese(中文)的使用_twenz for higher_百度空間

Stanford NLP Chinese(中文)的使用

Stanford NLP tools提供了處理中文的三個(gè)工具，分別是分詞、Parser；具體參考：

http://nlp.stanford.edu/software/parser-faq.shtml#o

?

1.分詞 Chinese segmenter

下載：http://nlp.stanford.edu/software/

Stanford Chinese Word Segmenter A Java implementation of a CRF-based Chinese Word Segmenter

這個(gè)包比較大，運(yùn)行時(shí)候需要的內(nèi)存也多，因而如果用eclipse運(yùn)行的時(shí)候需要修改虛擬內(nèi)存空間大小：

運(yùn)行-》自變量-》VM自變量-》-Xmx800m (最大內(nèi)存空間800m)

demo代碼（修改過的，未檢驗(yàn)）:

??? Properties props = new Properties();
??? props.setProperty("sighanCorporaDict", "data");
??? // props.setProperty("NormalizationTable", "data/norm.simp.utf8");
??? // props.setProperty("normTableEncoding", "UTF-8");
??? // below is needed because CTBSegDocumentIteratorFactory accesses it
??? props.setProperty("serDictionary","data/dict-chris6.ser.gz");
??? //props.setProperty("testFile", args[0]);
??? props.setProperty("inputEncoding", "UTF-8");
??? props.setProperty("sighanPostProcessing", "true");
?? ?
??? CRFClassifier classifier = new CRFClassifier(props);
??? classifier.loadClassifierNoExceptions("data/ctb.gz", props);
??? // flags must be re-set after data is loaded
??? classifier.flags.setProperties(props);
??? //classifier.writeAnswers(classifier.test(args[0]));
??? //classifier.testAndWriteAnswers(args[0]);
?? ?
??? String result = classifier.testString("我是中國人！");
??? System.out.println(result);

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2. Stanford Parser

可以參考http://nlp.stanford.edu/software/parser-faq.shtml#o

http://blog.csdn.net/leeharry/archive/2008/03/06/2153583.aspx

根據(jù)輸入的訓(xùn)練庫不同，可以處理英文，也可以處理中文。輸入是分詞好的句子，輸出詞性、句子的語法樹（依賴關(guān)系）

英文demo（下載的壓縮文件中有）：

??? LexicalizedParser lp = new LexicalizedParser("englishPCFG.ser.gz");
??? lp.setOptionFlags(new String[]{"-maxLength", "80", "-retainTmpSubcategories"});

??? String[] sent = { "This", "is", "an", "easy", "sentence", "." };
??? Tree parse = (Tree) lp.apply(Arrays.asList(sent));
??? parse.pennPrint();
??? System.out.println();

??? TreebankLanguagePack tlp = new PennTreebankLanguagePack();
??? GrammaticalStructureFactory gsf = tlp.grammaticalStructureFactory();
??? GrammaticalStructure gs = gsf.newGrammaticalStructure(parse);
??? Collection tdl = gs.typedDependenciesCollapsed();
??? System.out.println(tdl);
??? System.out.println();

??? TreePrint tp = new TreePrint("penn,typedDependenciesCollapsed");
??? tp.printTree(parse);

中文有些不同：

? //LexicalizedParser lp = new LexicalizedParser("englishPCFG.ser.gz");
??? LexicalizedParser lp = new LexicalizedParser("xinhuaFactored.ser.gz");
??? //lp.setOptionFlags(new String[]{"-maxLength", "80", "-retainTmpSubcategories"});

??? //??? String[] sent = { "This", "is", "an", "easy", "sentence", "." };
??? String[] sent = { "他", "和", "我", "在",? "學(xué)校", "里", "常", "打", "桌球", "。" };
??? String sentence = "他和我在學(xué)校里常打臺(tái)球。";
??? Tree parse = (Tree) lp.apply(Arrays.asList(sent));
??? //Tree parse = (Tree) lp.apply(sentence);
? ?
??? parse.pennPrint();
?? ?
??? System.out.println();
/*
??? TreebankLanguagePack tlp = new PennTreebankLanguagePack();
??? GrammaticalStructureFactory gsf = tlp.grammaticalStructureFactory();
??? GrammaticalStructure gs = gsf.newGrammaticalStructure(parse);
??? Collection tdl = gs.typedDependenciesCollapsed();
??? System.out.println(tdl);
??? System.out.println();
*/
??? //only for English
??? //TreePrint tp = new TreePrint("penn,typedDependenciesCollapsed");
??? //chinese
??? TreePrint tp = new TreePrint("wordsAndTags,penn,typedDependenciesCollapsed",new ChineseTreebankLanguagePack());
??? tp.printTree(parse);

然而有些時(shí)候我們不是光只要打印出來的語法依賴關(guān)系，而是希望得到關(guān)于語法樹(圖)，則需要采用如下的程序：
?? ??? ?String[] sent = { "他", "和", "我", "在",? "學(xué)校", "里", "常", "打", "桌球", "。" };
?? ??? ?ParserSentence ps = new ParserSentence();
?? ??? ?Tree parse = ps.parserSentence(sent);
?? ??? ?parse.pennPrint();
?? ??? ?TreebankLanguagePack tlp = new ChineseTreebankLanguagePack();
?? ???? GrammaticalStructureFactory gsf = tlp.grammaticalStructureFactory();
?? ???? GrammaticalStructure gs = gsf.newGrammaticalStructure(parse);
?? ???? Collection tdl = gs.typedDependenciesCollapsed();
?? ???? System.out.println(tdl);
?? ???? System.out.println();
?? ???? for(int i = 0;i < tdl.size();i ++)
?? ???? {
?? ??? ??? ?//TypedDependency(GrammaticalRelation reln, TreeGraphNode gov, TreeGraphNode dep)
?? ??? ??? ?TypedDependency td = (TypedDependency)tdl.toArray()[i];
?? ??? ??? ?System.out.println(td.toString());
?? ???? }

//采用GrammaticalStructure的方法 getGrammaticalRelation ( TreeGraphNode ?gov, TreeGraphNode ?dep)可以獲得兩個(gè)詞的語法依賴關(guān)系

Stanford NLP Chinese(中文)的使用