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Merge pull request #1343 from explosion/feature/phrasematcher

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Update PhraseMatcher for spaCy 2
This commit is contained in:
Matthew Honnibal 2017-09-26 20:44:23 +02:00 committed by GitHub
commit 1ef4236f8e
3 changed files with 95 additions and 72 deletions
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72
examples/multi_word_matches.py → examples/phrase_matcher.py
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@ -20,71 +20,71 @@ The algorithm is O(n) at run-time for document of length n because we're only ev
matching over the tag patterns. So no matter how many phrases we're looking for,
our pattern set stays very small (exact size depends on the maximum length we're
looking for, as the query language currently has no quantifiers)
The example expects a .bz2 file from the Reddit corpus, and a patterns file,
formatted in jsonl as a sequence of entries like this:
{"text":"Anchorage"}
{"text":"Angola"}
{"text":"Ann Arbor"}
{"text":"Annapolis"}
{"text":"Appalachia"}
{"text":"Argentina"}
"""
from __future__ import print_function, unicode_literals, division
from ast import literal_eval
from bz2 import BZ2File
import time
import math
import codecs
import plac
import ujson
from preshed.maps import PreshMap
from preshed.counter import PreshCounter
from spacy.strings import hash_string
from spacy.en import English
from spacy.matcher import PhraseMatcher
import spacy
def read_gazetteer(tokenizer, loc, n=-1):
for i, line in enumerate(open(loc)):
phrase = literal_eval('u' + line.strip())
if ' (' in phrase and phrase.endswith(')'):
phrase = phrase.split(' (', 1)[0]
if i >= n:
break
phrase = tokenizer(phrase)
if all((t.is_lower and t.prob >= -10) for t in phrase):
continue
data = ujson.loads(line.strip())
phrase = tokenizer(data['text'])
for w in phrase:
_ = tokenizer.vocab[w.text]
if len(phrase) >= 2:
yield phrase
def read_text(bz2_loc):
def read_text(bz2_loc, n=10000):
with BZ2File(bz2_loc) as file_:
for line in file_:
yield line.decode('utf8')
for i, line in enumerate(file_):
data = ujson.loads(line)
yield data['body']
if i >= n:
break
def get_matches(tokenizer, phrases, texts, max_length=6):
matcher = PhraseMatcher(tokenizer.vocab, phrases, max_length=max_length)
print("Match")
matcher = PhraseMatcher(tokenizer.vocab, max_length=max_length)
matcher.add('Phrase', None, *phrases)
for text in texts:
doc = tokenizer(text)
for w in doc:
_ = doc.vocab[w.text]
matches = matcher(doc)
for mwe in doc.ents:
yield mwe
for ent_id, start, end in matches:
yield (ent_id, doc[start:end].text)
def main(patterns_loc, text_loc, counts_loc, n=10000000):
nlp = English(parser=False, tagger=False, entity=False)
print("Make matcher")
phrases = read_gazetteer(nlp.tokenizer, patterns_loc, n=n)
counts = PreshCounter()
def main(patterns_loc, text_loc, n=10000):
nlp = spacy.blank('en')
nlp.vocab.lex_attr_getters = {}
phrases = read_gazetteer(nlp.tokenizer, patterns_loc)
count = 0
t1 = time.time()
for mwe in get_matches(nlp.tokenizer, phrases, read_text(text_loc)):
counts.inc(hash_string(mwe.text), 1)
for ent_id, text in get_matches(nlp.tokenizer, phrases, read_text(text_loc, n=n)):
count += 1
t2 = time.time()
print("10m tokens in %d s" % (t2 - t1))
with codecs.open(counts_loc, 'w', 'utf8') as file_:
for phrase in read_gazetteer(nlp.tokenizer, patterns_loc, n=n):
text = phrase.string
key = hash_string(text)
count = counts[key]
if count != 0:
file_.write('%d\t%s\n' % (count, text))
print("%d docs in %.3f s. %d matches" % (n, (t2 - t1), count))
if __name__ == '__main__':

75
spacy/matcher.pyx
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@ -421,47 +421,69 @@ cdef class PhraseMatcher:
cdef int max_length
cdef attr_t* _phrase_key
def __init__(self, Vocab vocab, phrases, max_length=10):
cdef public object _callbacks
cdef public object _patterns
def __init__(self, Vocab vocab, max_length=10):
self.mem = Pool()
self._phrase_key = <attr_t*>self.mem.alloc(max_length, sizeof(attr_t))
self.max_length = max_length
self.vocab = vocab
self.matcher = Matcher(self.vocab, {})
self.matcher = Matcher(self.vocab)
self.phrase_ids = PreshMap()
for phrase in phrases:
if len(phrase) < max_length:
self.add(phrase)
abstract_patterns = []
for length in range(1, max_length):
abstract_patterns.append([{tag: True} for tag in get_bilou(length)])
self.matcher.add('Candidate', 'MWE', {}, abstract_patterns, acceptor=self.accept_match)
self.matcher.add('Candidate', None, *abstract_patterns)
self._callbacks = {}
def add(self, Doc tokens):
cdef int length = tokens.length
assert length < self.max_length
tags = get_bilou(length)
assert len(tags) == length, length
def __len__(self):
raise NotImplementedError
def __contains__(self, key):
raise NotImplementedError
def __reduce__(self):
return (self.__class__, (self.vocab,), None, None)
def add(self, key, on_match, *docs):
cdef Doc doc
for doc in docs:
if len(doc) >= self.max_length:
msg = (
"Pattern length (%d) >= phrase_matcher.max_length (%d). "
"Length can be set on initialization, up to 10."
)
raise ValueError(msg % (len(doc), self.max_length))
cdef hash_t ent_id = self.matcher._normalize_key(key)
self._callbacks[ent_id] = on_match
cdef int length
cdef int i
cdef hash_t phrase_hash
for doc in docs:
length = doc.length
tags = get_bilou(length)
for i in range(self.max_length):
self._phrase_key[i] = 0
for i, tag in enumerate(tags):
lexeme = self.vocab[tokens.c[i].lex.orth]
lexeme = self.vocab[doc.c[i].lex.orth]
lexeme.set_flag(tag, True)
self._phrase_key[i] = lexeme.orth
cdef hash_t key = hash64(self._phrase_key, self.max_length * sizeof(attr_t), 0)
self.phrase_ids[key] = True
phrase_hash = hash64(self._phrase_key,
self.max_length * sizeof(attr_t), 0)
self.phrase_ids.set(phrase_hash, <void*>ent_id)
def __call__(self, Doc doc):
matches = []
for ent_id, label, start, end in self.matcher(doc):
cand = doc[start : end]
start = cand[0].idx
end = cand[-1].idx + len(cand[-1])
matches.append((start, end, cand.root.tag_, cand.text, 'MWE'))
for match in matches:
doc.merge(*match)
for _, start, end in self.matcher(doc):
ent_id = self.accept_match(doc, start, end)
if ent_id is not None:
matches.append((ent_id, start, end))
for i, (ent_id, start, end) in enumerate(matches):
on_match = self._callbacks.get(ent_id)
if on_match is not None:
on_match(self, doc, i, matches)
return matches
def pipe(self, stream, batch_size=1000, n_threads=2):
@ -469,7 +491,7 @@ cdef class PhraseMatcher:
self(doc)
yield doc
def accept_match(self, Doc doc, attr_t ent_id, attr_t label, int start, int end):
def accept_match(self, Doc doc, int start, int end):
assert (end - start) < self.max_length
cdef int i, j
for i in range(self.max_length):
@ -477,7 +499,8 @@ cdef class PhraseMatcher:
for i, j in enumerate(range(start, end)):
self._phrase_key[i] = doc.c[j].lex.orth
cdef hash_t key = hash64(self._phrase_key, self.max_length * sizeof(attr_t), 0)
if self.phrase_ids.get(key):
return (ent_id, label, start, end)
ent_id = <hash_t>self.phrase_ids.get(key)
if ent_id == 0:
return None
else:
return False
return ent_id

8
spacy/tests/test_matcher.py
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@ -34,7 +34,6 @@ def test_matcher_from_api_docs(en_vocab):
assert len(patterns[0])
@pytest.mark.xfail
def test_matcher_from_usage_docs(en_vocab):
text = "Wow 😀 This is really cool! 😂 😂"
doc = get_doc(en_vocab, words=text.split(' '))
@ -46,7 +45,8 @@ def test_matcher_from_usage_docs(en_vocab):
if doc.vocab.strings[match_id] == 'HAPPY':
doc.sentiment += 0.1
span = doc[start : end]
token = span.merge(norm='happy emoji')
token = span.merge()
token.vocab[token.text].norm_ = 'happy emoji'
matcher = Matcher(en_vocab)
matcher.add('HAPPY', label_sentiment, *pos_patterns)
@ -98,11 +98,11 @@ def test_matcher_match_multi(matcher):
(doc.vocab.strings['Java'], 5, 6)]
@pytest.mark.xfail
def test_matcher_phrase_matcher(en_vocab):
words = ["Google", "Now"]
doc = get_doc(en_vocab, words)
matcher = PhraseMatcher(en_vocab, [doc])
matcher = PhraseMatcher(en_vocab)
matcher.add('COMPANY', None, doc)
words = ["I", "like", "Google", "Now", "best"]
doc = get_doc(en_vocab, words)
assert len(matcher(doc)) == 1