Week 4 [Programming Assignment: Building your Deep Neural Network: Step by Step]. The "Validate" button shows no error in the notebook. However, when I submit the notebook, I only get 90/100. What is that about?

[ValidateApp | INFO] Validating '/home/jovyan/work/submitted/courseraLearner/W4A1/Building_your_Deep_Neural_Network_Step_by_Step.ipynb'
[ValidateApp | INFO] Executing notebook with kernel: python3
Tests failed on 1 cell(s)! These tests could be hidden. Please check your submission.

This is the error I get from the autograder. I haven’t added/deleted any cells. I have deleted all the extra output that I had for debugging and I have also made sure I coded within the lines for the entire assignment.

The Validate button just runs the tests in the notebook. If all those pass, it doesn’t necessarily mean that your code is completely correct. E.g. you may have hard-coded some things in your functions so that they work with the particular test cases in the notebook, but the grader uses different test cases that might, e.g., have different dimensions.

It looks like in your case the grader can’t tell you which of your functions failed. Please look through all your functions and make sure you did not hard-code any dimensions or reference any global variables in your functions.

I got the same warning messages. And I also got 90 out of 100. I checked it again. It all looked good to me. What should I do?