nn_backward_prop: Backward propagation function for a neural net
In casxue/bis557: Coursework for BIS 557

Applies backward propagation to calculate loss. Reproduced from CASL.

1	nn_backward_prop(x, y, weights, f_obj, sigma_p, f_p)

`x`	a numeric vector
`y`	a numeric vector
`weights`	a list created by nn_make_weights
`f_obj`	a list created by nn_forward_prop
`sigma_p`	derivative of activation function
`f_p`	derivative of the loss function

a list of updated weights and responses

casxue/bis557 documentation built on May 7, 2019, 5 a.m.

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