Keep shown the following message in grading results, but not shown
Cell #3. Can’t compile the student’s code. Error: IndexError(‘list index out of range’)
My guess is that you ran some experiments with the code early on which lets you examine some of the input images. But then you missed this key comment in the instructions:
Check out the some of the unmasked and masked images from the dataset:
After you are done exploring, revert back to N=2 . Otherwise the autograder will throw a list index out of range error.
You can’t say they didn’t warn you. 
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