Grader Error: Grader feedback not found (W3)

I have found this error during submission of my U-NET assignment. How to solve it?

Which error?? :face_with_peeking_eye: :saluting_face: :thinking: :face_with_raised_eyebrow:

“Grader feedback not found” generally means you have mangled your notebook file in some way that confused the grader.

Among the possible issues:

  • Deleting the grader keys, like “UNQ_C?”
  • Renaming the notebook file.
  • Adding cells.
  • Deleting cells.
  • Adding excessive print() statements for debugging, which make the notebook file too large for the grader.

The simplest solution is to start over with a fresh copy of the notebook.

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Right, as Tom says, this is usually some kind of structural problem. But I think it can also be caused by running the training and creating a large memory footprint for your notebook. Here’s a cheap and easy thing to try first before you do the “Get a Clean Copy” procedure:

  1. Kernel → Restart and Clear Output
  2. Save
  3. Submit again

The point is that the grader does not need to see any of your generated output: it only needs to call your functions. And apparently having a large memory footprint for your notebook can mess over the grader. Here’s a thread where a student had exactly that error message and the “clear output” fixed it. And I think that was on this same assignment FWIW …

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