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cky-parser

  • In this project we will implement the cky (cyk) algorithm for english that acts as recognizer as well as parser.

  • We will be using NLTK for representing cfg grammars and parse trees, but parser will be generated from scratch.

Grammar :

The grammar stems from the Airline Travel Information System (ATIS), a project working on spoken dialog systems for air travel. The ATIS CFG is available in the NLTK data package, together with 98 test sentences.

Language : Python

Modules : NLTK

Problem Statement :
  • Given a test sentence find whether the ATIS grammar covers the senetence or not ( Recognizer )
  • If the test sentence is derived from the grammar, print all the different parse trees of the sentence.
  • We will be using tree module in NLTK to draw the trees.

Running the program :

In the command prompt : python cky_parser.py

  • press 1 for parser and 2 for Recogniser

  • For parser : test sentence 89 in Test Sentences would run.

  • For recogniser : All the Atis sentences will be tested