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author Jeff Hammel <k0scist@gmail.com>
date Mon, 04 Sep 2017 14:05:24 -0700
parents 433c475f42db
children 857a606783e1
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    [|  |     | ]
X = [x1 x2 ...xm] = A0
    [|  |     | ]

Z1 = w'X + b1

A1 = sigmoid(Z1)

Z2 = W2 A1 + b2

     [---]
W1 = [---]
     [---]

`W1x1` gives some column vector, where `x1`
is the first training example.