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Fix dropout for history features

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This commit is contained in:
Matthew Honnibal 2017-10-05 22:21:30 -05:00
parent b0618def8d
commit 3db0a32fd6
1 changed files with 8 additions and 2 deletions
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10
spacy/_ml.py
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@ -217,6 +217,7 @@ class PrecomputableMaxouts(Model):
from thinc import describe
from thinc.neural._classes.embed import _uniform_init
@describe.attributes(
nV=describe.Dimension("Number of vectors"),
nO=describe.Dimension("Size of output"),
@ -240,12 +241,12 @@ class Embed(Model):
def predict(self, ids):
if ids.ndim == 2:
ids = ids[:, self.column]
return self.ops.xp.ascontiguousarray(self.vectors[ids])
return self.ops.xp.ascontiguousarray(self.vectors[ids], dtype='f')
def begin_update(self, ids, drop=0.):
if ids.ndim == 2:
ids = ids[:, self.column]
vectors = self.ops.xp.ascontiguousarray(self.vectors[ids])
vectors = self.ops.xp.ascontiguousarray(self.vectors[ids], dtype='f')
def backprop_embed(d_vectors, sgd=None):
n_vectors = d_vectors.shape[0]
self.ops.scatter_add(self.d_vectors, ids, d_vectors)
@ -267,8 +268,13 @@ def HistoryFeatures(nr_class, hist_size=8, nr_dim=8):
vectors, hist_ids = vectors_hists
hist_feats, bp_hists = embed.begin_update(hist_ids)
outputs = ops.xp.hstack((vectors, hist_feats))
mask = ops.get_dropout_mask(outputs.shape, drop)
if mask is not None:
outputs *= mask
def add_history_bwd(d_outputs, sgd=None):
if mask is not None:
d_outputs *= mask
d_vectors = d_outputs[:, :vectors.shape[1]]
d_hists = d_outputs[:, vectors.shape[1]:]
bp_hists(d_hists, sgd=sgd)