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From: Sohail on 12 Aug 2010 11:56
Hi,

When I define my own production rules for the grammar the code below
runs fine. Can anyone tell me how to use the built in grammars of nltk
(if there are any)?

>>> groucho_grammar = nltk.parse_cfg("""
.... S -> NP VP
.... PP -> P NP
.... NP -> Det N | Det N PP | 'I'
.... VP -> V NP | VP PP
.... Det -> 'an' | 'my'
.... N -> 'elephant' | 'pajamas'
.... V -> 'shot'
.... P -> 'in'
.... """)
>>> sent = ['I', 'shot', 'an', 'elephant', 'in', 'my', 'pajamas']
>>> parser = nltk.ChartParser(groucho_grammar)
>>> trees = parser.nbest_parse(sent)
>>> for tree in trees:
.... print tree

thanks
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