def get_updates(self, params, cost):
grads = self.get_grads(params, cost)
updates = OrderedDict()
t_prev = shared(np.asarray(0., dtype=get_dtype()))
one = tensor.constant(1)
t = t_prev + 1
a_t = self.learning_rate * tensor.sqrt(one - self.beta2**t) / (
one - self.beta1**t)
for param, g_t in zip(params, grads):
value = param.get_value(borrow=True)
m_prev = shared(np.zeros(value.shape, dtype=value.dtype),
broadcastable=param.broadcastable)
v_prev = shared(np.zeros(value.shape, dtype=value.dtype),
broadcastable=param.broadcastable)
m_t = self.beta1 * m_prev + (one - self.beta1) * g_t
v_t = self.beta2 * v_prev + (one - self.beta2) * g_t**2
step = a_t * m_t / (tensor.sqrt(v_t) + self.epsilon)
updates[m_prev] = m_t
updates[v_prev] = v_t
updates[param] = param - step
updates[t_prev] = t
updates.update(self.get_lr_updates())
return updates
def get_updates(self, params, cost):
grads = self.get_grads(params, cost)
t_prev = shared(np.asarray(0., dtype=get_dtype()))
updates = OrderedDict()
# Using theano constant to prevent upcasting of float32
one = tensor.constant(1)
t = t_prev + 1
a_t = self.learning_rate / (one - self.beta1**t)
for param, g_t in zip(params, grads):
value = param.get_value(borrow=True)
m_prev = shared(np.zeros(value.shape, dtype=value.dtype),
broadcastable=param.broadcastable)
u_prev = shared(np.zeros(value.shape, dtype=value.dtype),
broadcastable=param.broadcastable)
m_t = self.beta1 * m_prev + (one - self.beta1) * g_t
u_t = tensor.maximum(self.beta2 * u_prev, abs(g_t))
step = a_t * m_t / (u_t + self.epsilon)
updates[m_prev] = m_t
updates[u_prev] = u_t
updates[param] = param - step
updates[t_prev] = t
updates.update(self.get_lr_updates())
return updates
def sample(self, size):
flat_shape = (size[0], np.prod(size[1:]))
a = get_rng().normal(loc=0., scale=1., size=flat_shape)
u, _, v = np.linalg.svd(a, full_matrices=False)
q = u if u.shape == flat_shape else v
value = q.reshape(size).astype(get_dtype())
return value
def __init__(self,
learning_rate=0.001,
decay=0.,
clip_norm=0.,
max_norm=0.):
self.learning_rate = shared(np.cast[get_dtype()](learning_rate))
self.decay = decay
self.clip_norm = clip_norm
self.max_norm = max_norm
def sample(self, size):
value = get_rng().normal(loc=0.0, scale=self.scale, size=size)
value = value.astype(get_dtype())
return value
def sample(self, size):
value = get_rng().uniform(-self.scale, self.scale, size=size)
value = value.astype(get_dtype())
return value
def sample(self, size):
value = np.ones(size, dtype=get_dtype())
return value
def build(self):
# load vocabulary
with open(self.vocab_path, 'rb') as fin:
vocabs_freqs = pickle.load(fin)
threshold = 1 if self.threshold is None else self.threshold
sorted_vocab = [word for word, freq in sorted(vocabs_freqs.items()) if freq >= threshold]
sorted_vocab.append(_UNKNOWN)
sorted_vocab.append(_ZERO)
self.idx_to_vocab = {i: vocab for i, vocab in enumerate(sorted_vocab)}
self.vocab_to_idx = {vocab: i for i, vocab in enumerate(sorted_vocab)}
pkl_path = "./f_data/prefix-{}-thre-{}-valid-{}-test-{}-total-{}.pkl".format(
self.prefix, self.threshold, self.valid_split, self.test_split, self.total_len)
print("Building data ...")
if os.path.exists(pkl_path):
with open(pkl_path, 'rb') as fin:
self.all_xs, self.all_ys, \
self._train_start, self._train_end, \
self._valid_start, self._valid_end, \
self._test_start, self._test_end = pickle.load(fin)
else:
# load xs in index
all_xs = []
remove_idxs = []
with open(os.path.join(os.getcwd(), self.xs_path), encoding='utf-8') as fin:
i = 0
for line in fin:
sentences = [sent.strip().split() for sent in line.strip().split("\t")]
if len(sentences) != 2:
print("Not A Pair: {}".format(line))
remove_idxs.append(i)
else:
all_xs.append(sentences)
i += 1
if i == self.total_len:
break
self.all_xs = all_xs
# load ys
with open(os.path.join(os.getcwd(), self.ys_path), 'rb') as fin:
idx_all_ys = pickle.load(fin)
if self.total_len > 0:
idx_all_ys = idx_all_ys[:self.total_len]
for i in remove_idxs:
idx_all_ys.pop(i)
idx_all_ys = np.asarray(idx_all_ys, dtype='int32')
self.all_ys = np.zeros((idx_all_ys.shape[0], 2), dtype=get_dtype())
for i in range(2):
self.all_ys[idx_all_ys == i, i] = 1
if self.total_len == -1:
self.total_len = len(all_xs)
# shuffle data
self.shuffle_data(self.all_xs, self.all_ys)
# the start and end of the valid and test splits
valid_len = int(self.total_len * self.valid_split)
test_len = int(self.total_len * self.test_split)
train_len = int(self.total_len * (1 - self.valid_split - self.test_split))
self._train_start, self._train_end = 0, train_len
self._valid_start, self._valid_end = train_len, train_len + valid_len
self._test_start, self._test_end = train_len + valid_len, train_len + valid_len + test_len
# pickle
with open(pkl_path, 'wb') as fin:
dump_contents = [self.all_xs, self.all_ys,
self._train_start, self._train_end,
self._valid_start, self._valid_end,
self._test_start, self._test_end]
pickle.dump(dump_contents, fin)
assert len(self.all_xs) == len(self.all_ys)
self.index_to_tag = self.get_index_to_tag()
def build(self, **kwargs):
assert self.comp_objective is not None
assert self.comp_optimizer is not None
# random seed
if self.seed:
set_seed(self.seed)
# forward
train_prob_ys, train_ys, train_loss = self._forward(True)
if self.train_test_split:
predict_prob_ys, predict_ys, predict_loss = self._forward(False)
else:
predict_prob_ys, predict_ys, predict_loss = train_prob_ys, train_ys, train_loss
# regularizers
regularizers = []
for layer in self.comp_layers:
regularizers.extend(layer.regularizers)
regularizer_loss = tensor.cast(tensor.sum(regularizers), get_dtype())
# total loss
total_train_losses = regularizer_loss + train_loss
# params
params = []
for layer in self.comp_layers:
params += layer.params
# layer updates
layer_updates = OrderedDict()
for layer in self.comp_layers:
layer_updates.update(layer.updates)
# model updates
updates = self.comp_optimizer(params, total_train_losses)
updates.update(layer_updates)
# inputs
if is_iterable(self.input_tensor):
inputs = list(self.input_tensor) + [self.output_tensor]
else:
inputs = [self.input_tensor, self.output_tensor]
train_outputs = [
train_ys,
]
# train functions
for metric in self.train_metrics:
if isinstance(metric, metrics.Regularizer):
train_outputs.append(regularizer_loss)
elif isinstance(metric, metrics.Loss):
train_outputs.append(train_loss)
elif isinstance(metric, metrics.TotalLoss):
train_outputs.append(total_train_losses)
else:
train_outputs.append(metric(train_prob_ys, self.output_tensor))
self.train_func_for_eval = function(inputs=inputs,
outputs=train_outputs,
updates=updates)
# test functions
test_outputs = [
predict_ys,
]
for metric in self.predict_metrics:
if isinstance(metric, metrics.Loss):
test_outputs.append(predict_loss)
else:
test_outputs.append(metric(predict_prob_ys,
self.output_tensor))
self.predict_func_for_eval = function(inputs=inputs,
outputs=test_outputs)
