Moved Model Card Callback init in Trainer to a separate function

[tRosenflanz]

Model Card Callback is now added/initialized in a separate function that can be disabled/customized by subclassing the trainer

#3016

[tomaarsen]

Hello!

Thanks a bunch for setting this up. I made some minor changes: renamed the method & added a docstring which should look like this in the new documentation:

I'll merge this once the tests go green!

• Tom Aarsen

[tomaarsen]

Looks like I can't move the default_args_dict to after the super().__init__() due to some magic by accelerate. I reverted that change.

• Tom Aarsen