Просмотр кода страницы Lecture 4. Parsing

Ekaterina Chernyak, Dmitry Ilvovsky

== Two approaches to grammar modeling ==

=== Constituency grammar [Martin, Jurafsky, 2000] ===

Phrase structure organizes words into nested constituents

=== Dependency grammar [Martin, Jurafsky, 2000] ===

Dependency structure shows which words depend on (modify or are arguments of) which other words.

== Constituency VS dependency grammar (1) ==

[[Файл:L4 p1.jpg|обрамить|Constituency VS dependency grammar (1)]]
[[Файл:L4 p2.jpg|обрамить|Constituency VS dependency grammar (2)]]
=== Exercise 4.1 ===

Construct constituency and dependency trees for the sentences: 

* "Susan wants to marry Lary."
* "They saw a man with the telescope."
* "Why do we say that the earth moves around the sun?"

== Demos ==

* Berkley Tomcat constituency parser [http://tomato.banatao.berkeley.edu:8080/parser/parser.html|http://tomato.banatao.berkeley.edu:8080/parser/parser.html]
* Stanford CoreNLP dependency parser [http://nlp.stanford.edu:8080/corenlp/|http://nlp.stanford.edu:8080/corenlp/]
* ARK dependency parser (Carnegie Melon) [http://demo.ark.cs.cmu.edu/parse|http://demo.ark.cs.cmu.edu/parse]