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Hi Parag, I have tweaked lectures from 0 to 3. Semicolons was added to pyplot statements suppressing an output and several DeprecationWarnings was removed.
I didn't run notebook with celebs (I don't have dataset), so run it if you want to make things more beautiful out of the box. Also printing learning cost yielded very long output (I have ATI GPU so maybe that's a reason), thus I changed it to print out only every 1K'th iteration, you may invent a variable for printing threshold and let student decide the right threshold for him (because students w/o nVidia may encounter the same problem).
In one word, please run changes and if all is fine, let me know, I'll finish lectures 4, 5 tomorrow!