Hello! I’ve submitted my model several times and I keep getting an obscure error: “There was a problem grading your submission. Check stderr for more details.”
Unfortunately, there are no more details provided. I built the original model on my local setup, then did it again in collab, but neither submission worked.
My loss and validation accuracy were: loss: 0.0031 - accuracy: 0.7927
I reported the issue to Coursera, but they have not replied.
Hi @ElDuderino,
With version of tf are you using? try with tf 2.8. It can solve the problem.
You can use this lines at the beginning of the notebook:
Install packages for compatibility with the autograder
!pip install tensorflow==2.8.0 --quiet
!pip install keras==2.8.0 --quiet
Are you using the last version of the notebook? If not try to refresh your notebook. Please keep a copy before 
Hope it helps!
Hi Pere,
When I ran the colab, I neglected to restart the runtime.
It worked now!
Sincere thanks!