Answer mismatch in the Exercise 8 - lstm_backward
My answers are not matching with expected answers in Exercise 8 - lstm_backward.
Shapes are right, but the values are wrong. I cannot figure out the error in the code. Please help.
Hmmm, yes, all the values are wrong. I’m assuming that your lstm_cell_backward code passed the tests. So the most likely thing is that you are passing incorrect arguments when you call lstm_cell_backward from lstm_backward. The hard work here is actually in lstm_cell_backward.
They don’t say much in the instructions for lstm_backward, but they suggest that you compare how things worked when you called rnn_cell_backward from rnn_backward. The first and third arguments should look the same as in that previous case, but then you’ve also got c to deal with in the second argument.
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If those hints aren’t enough to help, please check your DMs for a message from me about how to proceed.
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To close the loop on the public thread, the bug was really subtle and hard to spot, but there was one misplaced “close paren” in the code in lstm_cell_backward that caused the different values. The tests for lstm_cell_backward failed, but only in the dc_prev values.
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Thank you sir.
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