log
paddle.fluid.layers.
log
(x, name=None)[源代码]
Log激活函数(计算自然对数)
- 参数:
- x (Variable) – 该OP的输入为LodTensor/Tensor。数据类型为float32,float64。
- name (str,可选) – 该参数供开发人员打印调试信息时使用,具体用法请参见 Name ,默认值为None。
返回:Log算子自然对数输出
返回类型: Variable - 该OP的输出为LodTensor/Tensor,数据类型为输入一致。
代码示例
- import paddle.fluid as fluid
- import numpy as np
- # Graph Organizing
- x = fluid.layers.data(name="x", shape=[1], dtype="float32")
- res = fluid.layers.log(x)
- # Create an executor using CPU as an example
- exe = fluid.Executor(fluid.CPUPlace())
- exe.run(fluid.default_startup_program())
- # Execute
- x_i = np.array([[1], [2]]).astype(np.float32)
- res_val, = exe.run(fluid.default_main_program(), feed={'x':x_i}, fetch_list=[res])
- print(res_val) # [[0.], [0.6931472]]