1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
# Natural Language Toolkit: Chunk parsing API
#
# Copyright (C) 2001-2009 NLTK Project
# Author: Edward Loper <edloper@gradient.cis.upenn.edu>
# Steven Bird <sb@csse.unimelb.edu.au> (minor additions)
# URL: <http://www.nltk.org/>
# For license information, see LICENSE.TXT
##//////////////////////////////////////////////////////
## Chunk Parser Interface
##//////////////////////////////////////////////////////
from nltk.parse import ParserI
class ChunkParserI(ParserI):
"""
A processing interface for identifying non-overlapping groups in
unrestricted text. Typically, chunk parsers are used to find base
syntactic constituants, such as base noun phrases. Unlike
L{ParserI}, C{ChunkParserI} guarantees that the C{parse} method
will always generate a parse.
"""
def parse(self, tokens):
"""
@return: the best chunk structure for the given tokens
and return a tree.
@param tokens: The list of (word, tag) tokens to be chunked.
@type tokens: C{list} of L{tuple}
@rtype: L{Tree}
"""
assert 0, "ChunkParserI is an abstract interface"
|
