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spaCy
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Add dropout to parser

This commit is contained in:
Matthew Honnibal 2017-03-30 02:36:33 +02:00
parent 1f292bfd17
commit 2a91d641e6
1 changed files with 18 additions and 8 deletions
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26
spacy/syntax/parser.pyx
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@ -193,13 +193,11 @@ cdef class Parser:
elif 'features' not in cfg:
cfg['features'] = self.feature_templates
self.model = ParserModel(self.moves.n_moves, cfg['features'],
size=2**18,
size=2**14,
learn_rate=cfg.get('learn_rate', 0.001))
#self.model.l1_penalty = cfg.get('L1', 1e-8)
#self.model.learn_rate = cfg.get('learn_rate', 0.001)
#self.model.l1_penalty = cfg.get('L1', 0.0)
self.optimizer = SGD(NumpyOps(), cfg.get('learn_rate', 0.001),
momentum=0.9)
self.optimizer = Adam(NumpyOps(), cfg.get('learn_rate', 0.001))
self.cfg = cfg
@ -337,9 +335,19 @@ cdef class Parser:
cdef Transition action
words = [w.text for w in tokens]
cdef int i
cdef double[::1] py_dropout
cdef double* dropout
while not stcls.is_final():
nr_feat = self.model.set_featuresC(context, features, stcls.c)
py_dropout = numpy.random.uniform(0., 1., nr_feat)
dropout = &py_dropout[0]
for i in range(nr_feat):
if dropout[i] < 0.5:
features[i].value = 0
else:
features[i].value *= 2
self.moves.set_costs(is_valid, costs, stcls, gold)
self.model.set_scoresC(scores, features, nr_feat)
@ -347,6 +355,9 @@ cdef class Parser:
best = arg_max_if_gold(scores, costs, nr_class)
self.model.regression_lossC(d_scores, scores, costs)
for i in range(nr_class):
if not is_valid[i]:
d_scores[i] = 0
self.model.set_gradientC(d_scores, features, nr_feat)
action = self.moves.c[guess]
@ -354,7 +365,7 @@ cdef class Parser:
#print(scores[guess], scores[best], d_scores[guess], costs[guess],
# self.moves.move_name(action.move, action.label), stcls.print_state(words))
loss += scores[guess]
loss += abs(scores[guess] + costs[guess])
memset(context, 0, sizeof(context))
memset(features, 0, sizeof(features[0]) * nr_feat)
memset(scores, 0, sizeof(scores[0]) * nr_class)
@ -363,8 +374,7 @@ cdef class Parser:
for i in range(nr_class):
is_valid[i] = 1
#if itn % 100 == 0:
# self.optimizer(self.model.model[0].ravel(),
# self.model.model[1].ravel(), key=1)
# self.model.finish_update(self.optimizer)
return loss
def step_through(self, Doc doc):