noam_decay

• paddle.fluid.layers.noam_decay(d_model, warmup_steps)[源代码]

Noam衰减方法

noam衰减的numpy实现如下：

import paddle.fluid as fluid
import numpy as np
# 设置超参数
d_model = 2
current_steps = 20
warmup_steps = 200
# 计算
lr_value = np.power(d_model, -0.5) * np.min([
                       np.power(current_steps, -0.5),
                       np.power(warmup_steps, -1.5) * current_steps])

请参照 attention is all you need

• 参数：
• • d_model (Variable|int) - 模型的输入、输出向量特征维度。类型可设置为标量Tensor，或int值。
  • warmup_steps (Variable|int) - 预热步数，类型可设置为标量Tensor，或int值。

返回：衰减的学习率

返回类型： Variable

代码示例：

import paddle.fluid as fluid
warmup_steps = 100
learning_rate = 0.01
lr = fluid.layers.learning_rate_scheduler.noam_decay(
               1/(warmup_steps *(learning_rate ** 2)),
               warmup_steps)