log2

paddle. log2 ( x, name=None ) [源代码]

Log2 激活函数(计算底为 2 的对数)

\[\begin{split}\\Out=log_2x\\\end{split}\]

参数

  • x (Tensor) – 该 OP 的输入为 Tensor。数据类型为 int32,int64,float16,bfloat16,float32,float64。

  • name (str,可选) - 具体用法请参见 Name,一般无需设置,默认值为 None。

返回

Tensor,Log2 算子底为 2 对数输出,数据类型与输入一致。

代码示例

import paddle

# example 1: x is a float
x_i = paddle.to_tensor([[1.0], [2.0]])
res = paddle.log2(x_i) # [[0.], [1.0]]

# example 2: x is float32
x_i = paddle.full(shape=[1], fill_value=2, dtype='float32')
paddle.to_tensor(x_i)
res = paddle.log2(x_i)
print(res) # [1.0]

# example 3: x is float64
x_i = paddle.full(shape=[1], fill_value=2, dtype='float64')
paddle.to_tensor(x_i)
res = paddle.log2(x_i)
print(res) # [1.0]