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Please refer to this link of Coursera discussion forum. [https://www.coursera.org/learn/machine-learning/discussions/weeks/5/threads/ag_zHUGDEeaXnBKVQldqyw]. In Q5 it is written that if we are doing element wise multiplication with g'(z), while calculating delta_2 , we must remove the first column of the Theta_2. The bug was that, it was asked to remove the first element of delta_2, which should be done only if we are doing element wise multiplication with a_2*(1- a_2), but here we are doing with g'(z).
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Please refer to this link of Coursera discussion forum. In Q5 it is written that if we are doing element wise multiplication with g'(z), while calculating delta_{2} , we must remove the first column of the Theta_2.
The bug was that, it was asked to remove the first element of delta_2, which should be done only if we are doing element wise multiplication with a_2*(1- a_2), but here we are doing with g'(z).