Coursera | Problem with Autograder in Week 4 of Deep learning Specialization's 1st course

We had a private discussion about this on another thread and the problem is that the notebook is very old and no longer compatible with the grader. I hope this is not the case, but my guess is it was probably copied from GitHub. If my guess on that is right, note that is cheating according to the course rules.

There is a topic about how to get a clean copy of the notebook here which is linked from the DLS FAQ Thread.