C2_W1_Assignment Exercise 1 - grader says model has zero layers when it does have layers

Course Q&A Machine Learning Specialization Advanced Learning Algorithms
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1

I’m trying to do the first assignment, C2_W1_Assignment and I’m running into a problem. For the first exercise, my code passes the tests within the Jupyter notebook. However, it fails in the grader with “Failed test case: model does not have 3 layers. Expected: 3, but got: 0.” The code which I’m currently using is identical to that in the hints. (I originally had some very similar code which a named/ keyword argument more like what is in the lecture notes e.g. the first layer had ‘Dense(units=25, activation=“sigmoid”)’; but I changed to what is in the hint in case the grader is very picky and prefers a specific implementation.). After a couple of attempts, I tried doing Kernel → “Restart and run all” and then submitting right after; but then it failed again. (Also, tried doing a “save and checkpoint”, then “restart and run all” and then submitting - still fails.)

Exercise 2 is also failing in the grader (while it passes the tests in the Jupyter notebook); but I expect that something is not working - either in my code when graded or in the grader itself - such that the model is not set up properly when exercise 2 is graded,

William

2

Actually it looks like “save and checkpoint” is not working either right now and I have no saved checkpoints at all despite using it. I see above the notebook “Autosave Failed!” and I can’t download my latest version of the notebook either; because an empty window pops up when I attempt to do so. A bit worried I will have to re-do all of my work then. Attaching a screenshot hopefully with the window scrolled to the most recent location,

William

screenshot_after_various_fails_29dec25
screenshot_after_various_fails_29dec251280×800 179 KB

3

Okay, I tried revisiting the assignment page again and I got this; so I may have to wait for something to be fixed on the server,

William

screenshot_after_later_revisit_29dec25
screenshot_after_later_revisit_29dec251280×800 117 KB

4

Okay, this has just worked and marked my assignment correct after revisiting the page and finding that it was available again. My earlier code was indeed not saved; but in order to save my work I copied-and-pasted my code from the “insertion points” in the notebook into an offline text file earlier,

William

5

Seems likely to have been a glitch in the cloud.
I was unable to test it before it started working again.
There was a similar report from another learner, in the same time-frame.

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