Integration Tests for attack.py

[abheesht17]

I am clueless about how to implement integration tests. Otherwise, I have run the code on datasets for all the four different classification losses on my local repo.

[rajaswa]

Sure. I can try and help.
Meanwhile, we can add example scripts, if not tests?

examples/attacks/run_attack_imdb.py

[abheesht17]

Yes, sure, I have a couple of examples which I tried. I'll put them up