Hi everyone! Thank you for reporting this! There is indeed a compatibility issue between the grader and the default TF version in Colab. We’ve marked the grader for an update but for now, it will be quicker to downgrade some of the packages to avoid the errors mentioned. If you open the notebook again from the classroom, you will see this code before the imports:
!pip install tensorflow==2.6.0
!pip install keras==2.6
You can also add it in your existing solution notebook before running the cells again to generate a new h5 file. The output should now be loaded successfully by the autograder. Hope it also works on your end!