Bug in W2A2/Emoji_v3a.ipynb

The following line:

maxLen = len(max(X_train, key=len).split())

should be:

maxLen = len(max(X_train, key=lambda x: len(x.split())).split())

The intention is trying to find out the max number of words among X_train elements, but the original code is trying to measure the number of words from the X_train elements that have the most chars.

This is a hidden bug since the actual X_train used in the example happen to have the two measures (as described above) the same.

Hey @zshao,
Thanks a lot for your feedback. I will create an issue for this, so that it can be rectified.

Cheers,
Elemento