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Fix dropout in parser

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This commit is contained in:
Matthew Honnibal 2017-05-23 15:20:45 -05:00
parent 5b67bcbee0
commit 620df0414f
1 changed files with 9 additions and 4 deletions
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13
spacy/syntax/nn_parser.pyx
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@ -249,11 +249,13 @@ cdef class Parser:
with Model.use_device('cpu'):
if depth == 0:
upper = chain()
upper.is_noop = True
else:
upper = chain(
clone(Maxout(hidden_width), (depth-1)),
zero_init(Affine(nr_class))
zero_init(Affine(nr_class, drop_factor=0.0))
)
upper.is_noop = False
# TODO: This is an unfortunate hack atm!
# Used to set input dimensions in network.
lower.begin_training(lower.ops.allocate((500, token_vector_width)))
@ -364,7 +366,7 @@ cdef class Parser:
cdef np.ndarray scores
c_token_ids = <int*>token_ids.data
c_is_valid = <int*>is_valid.data
cdef int has_hidden = hasattr(vec2scores, 'W')
cdef int has_hidden = not getattr(vec2scores, 'is_noop', False)
while not next_step.empty():
if not has_hidden:
for i in cython.parallel.prange(
@ -426,7 +428,7 @@ cdef class Parser:
states = self.moves.init_batch(docs)
state2vec, vec2scores = self.get_batch_model(len(states), tokvecs, cuda_stream,
drop)
0.0)
todo = [(s, g) for (s, g) in zip(states, golds)
if not s.is_final() and g is not None]
@ -438,11 +440,14 @@ cdef class Parser:
states, golds = zip(*todo)
token_ids = self.get_token_ids(states)
vector, bp_vector = state2vec.begin_update(token_ids, drop=drop)
vector, bp_vector = state2vec.begin_update(token_ids, drop=0.0)
mask = vec2scores.ops.get_dropout_mask(vector.shape, drop)
vector *= mask
scores, bp_scores = vec2scores.begin_update(vector, drop=drop)
d_scores = self.get_batch_loss(states, golds, scores)
d_vector = bp_scores(d_scores, sgd=sgd)
d_vector *= mask
if isinstance(self.model[0].ops, CupyOps) \
and not isinstance(token_ids, state2vec.ops.xp.ndarray):