Understanding Expm1() And Sigmoid() In PyTorch

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*Memos:

My post explains log() and log1p().
My post explains log2() and log10().
My post explains 
exp() and exp2().

expm1() can get the 0D or more D tensor of the zero or more elements by ex - 1 from the 0D or more D tensor of zero or more elements as shown below:
*Memos:

expm1() can be used with torch or a tensor.
The 1st argument(input) with torch or using a tensor(Required-Type:tensor of int, float, complex or bool). 
There is out argument with torch(Optional-Default:None-Type:tensor):
*Memos:

out= must be used.
My post explains out argument.


*A float tensor is retu...