Pass **kwargs in "generate" function instead of passing each argument by name

[DavidMChan]

Instead of wrapping the huggingface generate by copying each argument, it might be better to pass the arguments dynamically -- thus, when the underlying generate API changes, or more features are added, we can take advantage of them directly (instead of having to continue wrapping the arguments). This also gives users more flexibility to override the arguments.

The only default that I noticed was different from the default arguments in huggingface is open_flamingo sets top_k=0 instead of top_k=50. If we want to maintain parity with the existing code, we could easily overwrite this, but it might be better to just have the default arguments be in parity with the huggingface arguments.

The only downside to this I can see is that we lose some nice auto-completions in text editors, but I think this tradeoff is worth it.

Testing:

• I ran this locally with OpenFlamingo-3B-vitl-mpt1b and OpenFlamingo-9B-vitl-mpt7b, but there's no official tests, so I can't say that it for sure passes.

[anas-awadalla]

Looks great! I think you just need to run the code formatter for us to merge. We use black so can you run black . in the open_flamingo directory and push again?

[DavidMChan]

Yep! Sorry about that! I didn't realize my black config differed from yours!

[anas-awadalla]

That was quick 😄! Ok merging thanks!!