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<p>Migrated current public revision from wiki.cs.hse.ru</p> <p><b>Новая страница</b></p><div>Ekaterina Chernyak, Dmitry Ilvovsky<br /> <br /> == Two approaches to grammar modeling ==<br /> <br /> === Constituency grammar [Martin, Jurafsky, 2000] ===<br /> <br /> Phrase structure organizes words into nested constituents<br /> <br /> === Dependency grammar [Martin, Jurafsky, 2000] ===<br /> <br /> Dependency structure shows which words depend on (modify or are arguments of) which other words.<br /> <br /> == Constituency VS dependency grammar (1) ==<br /> <br /> [[Файл:L4 p1.jpg|обрамить|Constituency VS dependency grammar (1)]]<br /> [[Файл:L4 p2.jpg|обрамить|Constituency VS dependency grammar (2)]]<br /> === Exercise 4.1 ===<br /> <br /> Construct constituency and dependency trees for the sentences: <br /> <br /> * &quot;Susan wants to marry Lary.&quot;<br /> * &quot;They saw a man with the telescope.&quot;<br /> * &quot;Why do we say that the earth moves around the sun?&quot;<br /> <br /> == Demos ==<br /> <br /> * Berkley Tomcat constituency parser [http://tomato.banatao.berkeley.edu:8080/parser/parser.html|http://tomato.banatao.berkeley.edu:8080/parser/parser.html]<br /> * Stanford CoreNLP dependency parser [http://nlp.stanford.edu:8080/corenlp/|http://nlp.stanford.edu:8080/corenlp/]<br /> * ARK dependency parser (Carnegie Melon) [http://demo.ark.cs.cmu.edu/parse|http://demo.ark.cs.cmu.edu/parse]</div>

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