Week 1 Assignment 1--conv_forward

Course Q&A Deep Learning Specialization Convolutional Neural Networks
1

Hello,

I am getting the following assertion error saying that my code is failing one of the tests, but I can’t figure out why it is failing. My code is passing the very first test (which is not hidden). Can anyone help me out here?

Z's mean =
 0.0
Z[0,2,1] =
 [0. 0. 0. 0. 0. 0. 0. 0.]
cache_conv[0][1][2][3] =
 [-1.1191154   1.9560789  -0.3264995  -1.34267579]
(2, 13, 15, 8)
Error: Wrong output for variable in position 0.
 2  Tests passed
 1  Tests failed
---------------------------------------------------------------------------
AssertionError                            Traceback (most recent call last)
<ipython-input-45-182241fd5e53> in <module>
     11 print("cache_conv[0][1][2][3] =\n", cache_conv[0][1][2][3])
     12 
---> 13 conv_forward_test(conv_forward)

~/work/release/W1A1/public_tests.py in conv_forward_test(target)
    118     ]
    119 
--> 120     multiple_test(test_cases, target)
    121 
    122 

~/work/release/W1A1/test_utils.py in multiple_test(test_cases, target)
    151         print('\033[91m', len(test_cases) - success, " Tests failed")
    152         raise AssertionError(
--> 153             "Not all tests were passed for {}. Check your equations and avoid using global variables inside the function.".format(target.__name__))

AssertionError: Not all tests were passed for conv_forward. Check your equations and avoid using global variables inside the function.
2

The very first test is just that the shape of the output is correct. The values clearly are not. Here is my output for that test cell, although note that I added a bunch of prints to show the shapes of things;

New dimensions = 3 by 4
Shape Z = (2, 3, 4, 8)
Shape A_prev_pad = (2, 7, 9, 4)
Z's mean =
 0.5511276474566768
Z[0,2,1] =
 [-2.17796037  8.07171329 -0.5772704   3.36286738  4.48113645 -2.89198428
 10.99288867  3.03171932]
cache_conv[0][1][2][3] =
 [-1.1191154   1.9560789  -0.3264995  -1.34267579]
New dimensions = 9 by 11
Shape Z = (2, 9, 11, 8)
Shape A_prev_pad = (2, 11, 13, 4)
New dimensions = 2 by 3
Shape Z = (2, 2, 3, 8)
Shape A_prev_pad = (2, 5, 7, 4)

It looks like your Z values are all zeros, but they shouldn’t be. So that’s the place to look.