artificial intelligence - Connect 4 and neural networks -

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i'm trying code connect 4 - ia based on neural networks.

but it's first time use ann, i'm lost...

i found looks great, need explanations...

structure

i'm ok input, don't understand number of hiddens.

also, output should number of colomn put coin next turn, means value between 1 , 7.

but how these values, using sigmoid function ?


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