def _build_train(self):
"""Build training ops."""
print('-' * 80)
print('Building train graph')
reg_loss, loss = self._forward(self.x_train,
self.y_train,
self.train_params,
self.batch_init_states,
is_training=True)
tf_vars = tf.trainable_variables()
global_step = tf.train.get_or_create_global_step()
lr_scale = (tf.cast(tf.shape(self.y_train)[-1], dtype=tf.float32) /
tf.cast(self.params.bptt_steps, dtype=tf.float32))
learning_rate = utils.get_lr(global_step, self.params) * lr_scale
# learning_rate = tf.Print(
# learning_rate,
# [learning_rate, lr_scale, self.base_bptt, tf.shape(self.y_train)],
# message='lr: ', summarize=3)
grads = tf.gradients(reg_loss, tf_vars)
clipped_grads, grad_norm = tf.clip_by_global_norm(
grads, self.params.grad_bound)
(self.update_moving_avg_ops, self.use_moving_avg_vars,
self.restore_normal_vars) = self._create_average_ops()
optimizer = tf.train.GradientDescentOptimizer(learning_rate)
train_op = optimizer.apply_gradients(zip(clipped_grads, tf_vars),
global_step=global_step)
self.train_loss = loss
self.train_op = train_op
self.grad_norm = grad_norm
self.learning_rate = learning_rate
def _build_train(self):
"""Build training ops."""
print('-' * 80)
print('Building train graph')
reg_loss, loss = self._forward(self.x_train,
self.y_train,
self.train_params,
self.batch_init_states,
is_training=True)
tf_vars = [
v for v in tf.trainable_variables() if v.name.startswith(self.name)
]
global_step = tf.train.get_or_create_global_step()
lr_scale = (tf.cast(tf.shape(self.y_train)[-1], dtype=tf.float32) /
tf.cast(self.params.bptt_steps, dtype=tf.float32))
learning_rate = utils.get_lr(global_step, self.params) * lr_scale
if self.params.grad_bound:
grads = tf.gradients(reg_loss, tf_vars)
clipped_grads, grad_norm = tf.clip_by_global_norm(
grads, self.params.grad_bound)
optimizer = tf.train.GradientDescentOptimizer(learning_rate)
train_op = optimizer.apply_gradients(zip(clipped_grads, tf_vars),
global_step=global_step)
self.train_loss = loss
self.train_op = train_op
self.grad_norm = grad_norm
self.learning_rate = learning_rate