Course1 Week4 Exercise 9

In the first programming assignment of week 4 in exercise 9 my code is passing 2 test cases but the other one is failing. I am encountering the error as below.

Please check your code against the formulas and instructions given. Note that all your test failures are about the values of the various parameters. It has previously checked the shapes, so if those are all correct then your basic logic for handling the loops and calling the appropriate functions is probably either correct or very close.

You might get some clue by comparing the actual outputs against the expected outputs shown for that test. If they are all the right absolute value, but the opposite sign, then check your code for the dAL, which is the thing that starts off the whole back propagation calculation.