I am getting an error in grading of 4th exercise.
To help me assist you,
Please click on my name to start a private message. Then, attach your notebook as a .ipynb file. Please note that mentors cannot access your Coursera Jupyter workspace, so sending the notebook in a .ipynb format is essential.
You are on the right track. The staff have been informed to fix the grader. While you wait, use .input instead of .inputs when creating the final model.
Thanks for bringing this up.