expm1:
  description: |
    Returns exponential then minus 1 of a tensor element-wise.

    .. math::

      out_i = e^{x_i} - 1

    Args:
      input (Tensor): The input Tensor. :math:`x` in the above formula.

    Returns:
      Tensor, has the same shape as the `input`.

    Raises:
      TypeError: If `input` is not a Tensor.

    Supported Platforms:
      ``Ascend`` ``GPU`` ``CPU``

    Examples:
      >>> import mindspore
      >>> import numpy as np
      >>> from mindspore import Tensor, ops
      >>> x = Tensor(np.array([0.0, 1.0, 2.0, 4.0]), mindspore.float32)
      >>> output = ops.expm1(x)
      >>> print(output)
      [ 0.        1.718282  6.389056 53.598152]