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This adds a bunch of simple annotations suggested by https://github.com/JelleZijlstra/autotyping.

for some reason putting it in LM and having it be inherited breaks
everything. should try to figure this out at some point.

model_args should only be things that affect output of the model
therefore, stuff like batch size, device, etc shouldn't be in there

Now, if a run gets interrupted halfway, you can easily resume