Fix types in pycocotools

[ClementPinard]

👋 Hello there

Could not figure out why my type checker (pyright for that matter) was failing in my own code.

It turns out that some typings in pycocotools are wrong.

Namely :

COCOeval.eval is an entirely different dict from _EvaluationResult, as it can be seen here : https://github.com/cocodataset/cocoapi/blob/master/PythonAPI/pycocotools/cocoeval.py#L411

As such, I renamed the original _EvaluationResult into _ImageEvaluationResult and defined a new typed dict with the original name. Note that we could keep the original typed dict as is and create a new typed dict named something like _AccumulatedEvaluationResult, I don't have a preference.

I also could see that Params.areaRng is not a list, it's a list of list, as it can be seen here : https://github.com/cocodataset/cocoapi/blob/master/PythonAPI/pycocotools/cocoeval.py#L509

Note that it's actually either an int or a float. not sure if I should put int | float or simply float in that case.

[srittau]

Thanks!

Could you also change the return type of evaluateImg() to the new name?

[ClementPinard]

Ah yes you're right, sorry for missing that.

thanks for the review !

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉