# Timeline for What is the time complexity for training a neural network using back-propagation?

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Feb 21 '19 at 15:31 history edited nbro
Mar 24 '18 at 10:01 comment I think the answers are same. in my answer I can assume number of weights w = ij + jk + kl. basically sum of n * n_i between layers as you noted.
Mar 20 '18 at 13:50 comment @DuttaA No. There's a constant amount of work per weight, which gets repeated e times for each of m examples. I didn't bother to compute the number of weights, I guess, that's the difference.