def new_update(x, new_x):
if is_one_of(x, params) and self._do_layer_adaptation(x):
dx = new_x - x
lr_t = K.clip(self.learning_rate, K.epsilon(), 1e10)
x_norm = tf.norm(x)
g_norm = tf.norm(dx / lr_t)
ratio = K.switch(
x_norm > 0.0,
K.switch(g_norm > K.epsilon(), x_norm / g_norm, 1.0),
1.0)
new_x = x + dx * ratio
return old_update(x, new_x)
def compute_position_ids(self, inputs):
q, v = inputs
# 计算位置差
q_idxs = K.arange(0, K.shape(q)[1], dtype='int32')
q_idxs = K.expand_dims(q_idxs, 1)
v_idxs = K.arange(0, K.shape(v)[1], dtype='int32')
v_idxs = K.expand_dims(v_idxs, 0)
pos_ids = v_idxs - q_idxs
# 后处理操作
max_position = (self.input_dim - 1) // 2
pos_ids = K.clip(pos_ids, -max_position, max_position)
pos_ids = pos_ids + max_position
return pos_ids
def new_update(x, new_x):
if x is var and self._do_layer_adaptation(x):
dx = new_x - x
lr_t = self._decayed_lr(x.dtype.base_dtype)
lr_t = K.clip(lr_t, K.epsilon(), 1e10)
x_norm = tf.norm(x)
g_norm = tf.norm(dx / lr_t)
ratio = K.switch(
x_norm > 0.0,
K.switch(g_norm > K.epsilon(), x_norm / g_norm, 1.0),
1.0)
new_x = x + dx * ratio
return old_update(x, new_x)
