Fix simple issues and allow for cpu only use

[rami-alloush]

I had to make some changes to be able to use the code on cpu only system and had troubles saving the mask from the interactive GUI and fixed it.
Thanks for the great work.

[hkchengrex]

Thanks a lot. Is it possible to

1. Remove formatting changes like ' -> "? It would make the commits cleaner.
2. Move "bulk interactive" as an argument to the existing interactive.py?

[rami-alloush]

• I tried to fix the formatting and stick to your original style but not sure what formatter you use. I tried both autopep8 and black.
• I'll work on the second point.
  Thanks

[hkchengrex]

I am not using any formatter. Just trying to reduce unnecessary diff.
Thanks.