I think the equation should be \[ \text{NN}(x) = W_3\sigma_2(W_2\sigma_1(W_1x + b_1) + b2) + b_3 \] https://github.com/mitmath/18S096SciML/blob/eaa47ad4f248af09a5bed184d442cc6135bf5ffa/lecture2/ml.html#L1104
I think the equation should be
[ \text{NN}(x) = W_3\sigma_2(W_2\sigma_1(W_1x + b_1) + b2) + b_3 ]
18S096SciML/lecture2/ml.html
Line 1104 in eaa47ad