Len(parameters)//2 # number of layers in NN, how?

Course Q&A Deep Learning Specialization Neural Networks and Deep Learning
1

In assignment 1 of week 4, there is code block that states:

len(parameters)//2 # number of layers in NN

I don’t get how that makes sense.
Can someone explain.

2

There are two values in the parameters dictionary for each layer, right? W^{[l]} and b^{[l]}.

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