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mindspore.nn.Softmax

class mindspore.nn.Softmax(axis=- 1)

Softmax activation function.

Applies the Softmax function to an n-dimensional input Tensor.

The input is a Tensor of logits transformed with exponential function and then normalized to lie in range [0, 1] and sum up to 1.

Softmax is defined as:

$$\text{softmax}(x_i)=\frac{\exp (x_i)}{\sum _{j=0}^{n-1}\exp (x_j)},$$

where $x_i$ is the $i$-th slice in the given dimension of the input Tensor.

Parameters

axis (Union[int, tuple[int]]) – The axis to apply Softmax operation, -1 means the last dimension. Default: -1.

Inputs:

• x (Tensor) - The input of Softmax with data type of float16 or float32.

Outputs:

Tensor, which has the same type and shape as x with values in the range[0,1].

Raises

• TypeError – If axis is neither an int nor a tuple.

• TypeError – If dtype of x is neither float16 nor float32.

• ValueError – If axis is a tuple whose length is less than 1.

• ValueError – If axis is a tuple whose elements are not all in range [-len(x), len(x)).

Supported Platforms:

Ascend GPU CPU

Examples

>>> x = Tensor(np.array([-1, -2, 0, 2, 1]), mindspore.float16)
>>> softmax = nn.Softmax()
>>> output = softmax(x)
>>> print(output)
[0.03168 0.01166 0.0861  0.636   0.2341 ]