mindspore.numpy.log

mindspore.numpy.log(x, dtype=None)[源代码]

Returns the natural logarithm, element-wise.

The natural logarithm log is the inverse of the exponential function, so that log(exp(x)) = x. The natural logarithm is logarithm in base e.

说明

Numpy arguments out, where, casting, order, subok, signature, and extobj are not supported. On GPU, the supported dtypes are np.float16, and np.float32. On CPU, the supported dtypes are np.float16, np.float32, and np.float64.

参数

x (Tensor) – Input array.
dtype (mindspore.dtype, optional) – Defaults to None. Overrides the dtype of the output Tensor.

返回

Tensor or scalar, the natural logarithm of x, element-wise. This is a scalar if x is a scalar.

Supported Platforms:: Ascend GPU CPU

样例

>>> import mindspore.numpy as np
>>> x = np.array([2, 3, 4]).astype('float32')
>>> output = np.log(x)
>>> print(output)
[0.69314575 1.09861    1.3862929 ]