Error in Initializing Adam Optimization Method in Week 2 of Course 2

If you’re sure that doing:

Kernel → Restart and Clear Output
Cell → Run All Above
Then run your test cell

doesn’t work, then you must have damaged something in either the notebook or the file. Did you modify the “Import” block that is the first code cell in the notebook or did you edit You can get clean copies of both the notebook and the tests by using the procedures on this thread. Then “copy/paste” over your solution code to the clean copy and see if that helps. Note that you need to delete the file as part of the procedure or it won’t be replaced.