[Suggestion] Extending some frequently used functions

[grrrrreee]

Can I add function collection that are frequently used in various projects?

Such as Sigmoid function , RELU function, softmax function etc...

[shubhodeep9]

@finchparker yes

[grrrrreee]

Okay then I will make a code about it and gonna pull request in a week.
Thanks a lot!!!!

[ashwini0529]

@finchparker are you still on it?