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58 lines
1.7 KiB
Python
58 lines
1.7 KiB
Python
# coding: utf8
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from __future__ import unicode_literals
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from ...symbols import NOUN, PROPN, PRON, VERB, AUX
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def noun_chunks(obj):
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doc = obj.doc
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if not len(doc):
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return
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np_label = doc.vocab.strings.add('NP')
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left_labels = ['det', 'fixed', 'neg'] #['nunmod', 'det', 'appos', 'fixed']
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right_labels = ['flat', 'fixed', 'compound', 'neg']
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stop_labels = ['punct']
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np_left_deps = [doc.vocab.strings.add(label) for label in left_labels]
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np_right_deps = [doc.vocab.strings.add(label) for label in right_labels]
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stop_deps = [doc.vocab.strings.add(label) for label in stop_labels]
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token = doc[0]
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while token and token.i < len(doc):
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if token.pos in [PROPN, NOUN, PRON]:
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left, right = noun_bounds(doc, token, np_left_deps, np_right_deps, stop_deps)
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yield left.i, right.i+1, np_label
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token = right
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token = next_token(token)
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def is_verb_token(token):
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return token.pos in [VERB, AUX]
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def next_token(token):
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try:
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return token.nbor()
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except:
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return None
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def noun_bounds(doc, root, np_left_deps, np_right_deps, stop_deps):
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left_bound = root
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for token in reversed(list(root.lefts)):
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if token.dep in np_left_deps:
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left_bound = token
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right_bound = root
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for token in root.rights:
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if (token.dep in np_right_deps):
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left, right = noun_bounds(doc, token, np_left_deps, np_right_deps, stop_deps)
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if list(filter(lambda t: is_verb_token(t) or t.dep in stop_deps,
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doc[left_bound.i: right.i])):
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break
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else:
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right_bound = right
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return left_bound, right_bound
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SYNTAX_ITERATORS = {
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'noun_chunks': noun_chunks
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}
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