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70 lines
2.7 KiB
Cython
70 lines
2.7 KiB
Cython
# coding: utf-8
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from __future__ import unicode_literals
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from ..parts_of_speech cimport NOUN, PROPN, PRON
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def english_noun_chunks(obj):
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"""
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Detect base noun phrases from a dependency parse.
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Works on both Doc and Span.
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"""
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labels = ['nsubj', 'dobj', 'nsubjpass', 'pcomp', 'pobj',
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'attr', 'ROOT']
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doc = obj.doc # Ensure works on both Doc and Span.
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np_deps = [doc.vocab.strings.add(label) for label in labels]
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conj = doc.vocab.strings.add('conj')
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np_label = doc.vocab.strings.add('NP')
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seen = set()
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for i, word in enumerate(obj):
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if word.pos not in (NOUN, PROPN, PRON):
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continue
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# Prevent nested chunks from being produced
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if word.i in seen:
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continue
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if word.dep in np_deps:
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if any(w.i in seen for w in word.subtree):
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continue
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seen.update(j for j in range(word.left_edge.i, word.i+1))
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yield word.left_edge.i, word.i+1, np_label
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elif word.dep == conj:
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head = word.head
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while head.dep == conj and head.head.i < head.i:
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head = head.head
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# If the head is an NP, and we're coordinated to it, we're an NP
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if head.dep in np_deps:
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if any(w.i in seen for w in word.subtree):
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continue
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seen.update(j for j in range(word.left_edge.i, word.i+1))
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yield word.left_edge.i, word.i+1, np_label
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# this iterator extracts spans headed by NOUNs starting from the left-most
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# syntactic dependent until the NOUN itself
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# for close apposition and measurement construction, the span is sometimes
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# extended to the right of the NOUN
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# example: "eine Tasse Tee" (a cup (of) tea) returns "eine Tasse Tee" and not
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# just "eine Tasse", same for "das Thema Familie"
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def german_noun_chunks(obj):
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labels = ['sb', 'oa', 'da', 'nk', 'mo', 'ag', 'ROOT', 'root', 'cj', 'pd', 'og', 'app']
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doc = obj.doc # Ensure works on both Doc and Span.
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np_label = doc.vocab.strings['NP']
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np_deps = set(doc.vocab.strings[label] for label in labels)
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close_app = doc.vocab.strings['nk']
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rbracket = 0
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for i, word in enumerate(obj):
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if i < rbracket:
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continue
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if word.pos in (NOUN, PROPN, PRON) and word.dep in np_deps:
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rbracket = word.i+1
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# try to extend the span to the right
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# to capture close apposition/measurement constructions
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for rdep in doc[word.i].rights:
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if rdep.pos in (NOUN, PROPN) and rdep.dep == close_app:
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rbracket = rdep.i+1
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yield word.left_edge.i, rbracket, np_label
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CHUNKERS = {'en': english_noun_chunks, 'de': german_noun_chunks}
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