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spaCy
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Predict tags with encoder

This commit is contained in:
Matthew Honnibal 2017-05-08 07:53:45 -05:00
parent 56073a11ef
commit 94e86ae00a
1 changed files with 25 additions and 6 deletions
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19
spacy/pipeline.pyx
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@ -5,6 +5,7 @@ from thinc.api import chain, layerize, with_getitem
from thinc.neural import Model, Softmax
import numpy
from .tokens.doc cimport Doc
from .syntax.parser cimport Parser
#from .syntax.beam_parser cimport BeamParser
from .syntax.ner cimport BiluoPushDown
@ -30,24 +31,42 @@ class TokenVectorEncoder(object):
def __call__(self, doc):
doc.tensor = self.model([doc])[0]
self.predict_tags([doc])
def begin_update(self, docs, drop=0.):
tensors, bp_tensors = self.model.begin_update(docs, drop=drop)
for i, doc in enumerate(docs):
doc.tensor = tensors[i]
self.predict_tags(docs)
return tensors, bp_tensors
def predict_tags(self, docs, drop=0.):
cdef Doc doc
scores, _ = self.tagger.begin_update(docs, drop=drop)
idx = 0
for i, doc in enumerate(docs):
tag_ids = scores[idx:idx+len(doc)].argmax(axis=1)
for j, tag_id in enumerate(tag_ids):
doc.vocab.morphology.assign_tag_id(&doc.c[j], tag_id)
idx += 1
def update(self, docs, golds, drop=0., sgd=None):
scores, finish_update = self.tagger.begin_update(docs, drop=drop)
losses = scores.copy()
idx = 0
for i, gold in enumerate(golds):
if hasattr(self.tagger.ops.xp, 'scatter_add'):
ids = numpy.zeros((len(gold),), dtype='i')
start = idx
for j, tag in enumerate(gold.tags):
ids[j] = docs[0].vocab.morphology.tag_names.index(tag)
idx += 1
self.tagger.ops.xp.scatter_add(losses[start:idx], ids, -1.0)
else:
for j, tag in enumerate(gold.tags):
tag_id = docs[0].vocab.morphology.tag_names.index(tag)
losses[idx, tag_id] -= 1.
idx += 1
finish_update(losses, sgd)