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Rest Operator ... converts the rest parameters to JavaScript array.

for iteration are divided into for ... in ... and for ... of ....

String literal is a effective way to make string using defined variables.

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Numpy is a module for operating Vector and Matrix.

What is pythonic?

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Special Method, which is also called Magic Method, is a kind of method that can be set in user-defined class objects.

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Layer is the vector of Neurons, which are kinds of Parametric Function and generally have their own weight and their own bias for Featuring(Filtering)

Code.1-3-1: Activation Layers Code.1-3-2: Activation in Dense Layer