torch.cos
torch.cos(input, *, out=None) -> Tensor
Returns a new tensor with the cosine  of the elements of "input".
  \text{out}_{i} = \cos(\text{input}_{i})

Parameters:
      input (Tensor) -- the input tensor.
Keyword Arguments:
      out (Tensor, optional) -- the output tensor.
Example:
  >>> a = torch.randn(4)
  >>> a
  tensor([ 1.4309,  1.2706, -0.8562,  0.9796])
  >>> torch.cos(a)
  tensor([ 0.1395,  0.2957,  0.6553,  0.5574])
