C3W3 Assignment training time

For anyone who is running into issues with slow training times for this assignment, Colab was recently changed to no longer support GPU with Tensorflow 2.8 - and since this assignment specifically loads TF 2.8 for compatibility with the autograder. No GPU makes the training MUCH slower.

The staff will fix this issue when they get back from break in early January, but in the meantime:

Anyone who is working on a local machine environment can use the elegant solution @anoopebey came up with (see above). Thank you @anoopebey, very nice!

For the rest of us using Colab, I suggested a hacky work-around for the Week 1 assignment, that should work for this assignment, too:

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