mindspore.ops.sign

mindspore.ops.sign(input)[source]

Returns an element-wise indication of the sign of a number. Notice: When the input dtype is float64, the gradient of this operator is NaN.

\[\begin{split}\text{out}_{i} = \begin{cases} -1 & \text{input}_{i} < 0 \\ 0 & \text{input}_{i} = 0 \\ 1 & \text{input}_{i} > 0 \end{cases}\end{split}\]

Parameters: input (Tensor) – Input Tensor.
Returns: Tensor, the sign of input.
Raises: TypeError – If input is not a Tensor.

Supported Platforms:: Ascend GPU CPU

Examples

>>> import mindspore as ms
>>> import mindspore.ops as ops
>>> input = ms.Tensor([[-1, 0, 2, 4, 6], [2, 3, 5, -6, 0]])
>>> output = ops.sign(input)
>>> print(output)
[[-1  0  1  1  1]
 [ 1  1  1 -1  0]]
>>> ms.set_context(device_target="CPU")
>>> x = ms.Tensor([[-1, 0, float('inf'), 4, float('nan')], [2, 3, float('-inf'), -6, 0]])
>>> output = ops.sign(x)
>>> print(output)
[[-1.  0.  1.  1.  0.]
 [ 1.  1. -1. -1.  0.]]