Add code for forward prop; seems to run
Compute cost; start trying to compute gradient but incomplete
Reorganize variable names etc to be clear and consistent with tutorial
Testing with fewer convergence iterations
Finish implementing cost and grad, incl L2 penalty on Ws; seems to run
Reorder g_est and g(j) to match column labels in printout
Numerically check gradient for multilayer neural net
Compute sums, not means, in gradient
Minor edit of comment: change l2 to L2
It works! Add tests of different net architectures; note accuracies