C3_W1_Assignment: There was a problem grading your submission

[ai_curious]

The most common source of this error seems to be use of ‘global’ variables inside a graded function. The code runs fine in the Jupyter notebook because of the namespace and scope, but fails when executed as a standalone function in the autograder environment. See for example this similar thread:

Problem with grading assignement - no other output

Hello. I have earned 80/100 points in week 1 assignement and for two failing tasks - Sampling decode and MBR decode - I see no other message than “There was a problem grading your submission. Check stderr for more details.” But I do not see the stderr anywhere and all the units tests are passing. For mbr decode all the provided examples take an enormous amount of time, so I am not able to debug this properly, but I still think my function is correct (and as I said, unit tests are passing)

However, this one is also very interesting and doesn’t seem to be programmer self-inflicted:

C2W1 Assignment - grader output showed error

For reference to other learners who may run into the same issue: There is nothing wrong with the solutions. The issue is with the notebook metadata (it was missing). Problem is resolved with these steps: Rename your current notebook from within the Coursera jupyter workspace. Any filename will do (e.g. C2W1_Assignment_1.ipynb ). Click the Help button at the upper right. [Screen Shot 2021-05-19 at 10.00.57 PM] Click Get latest version . [Screen Shot 2021-05-19 at 10.01.08 PM] This …

Let us know what you find out?