MHGAN model

[k-k-d]

This model is an Auxiliary Classifier GAN model implemented using torchgan which samples images using the Metropolis Hastings algorithm.
MHGAN Research Paper - https://arxiv.org/pdf/1811.11357.pdf)

[avik-pal]

@k-k-d please rebase and update the code according to the guidelines in the readme

[k-k-d]

@avik-pal I have rebased the repo and updated it as much as I could understand. If I need to to something more, let me know.

[avik-pal]

@k-k-d Firstly fix the linting issues. It is mostly unused imports. You can run isort and yapf it will fix most of them. Then you shall have to fix the remaining manually