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Remove Callable parent of TorchDistributionMixin #3442

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@kosiokarchev

Will it be possible to remove Callable from the parents of TorchDistributionMixin (introduced in version 1.9)?
I'd like to make a generic subclass like

class MyDist(TorchDistribution, Generic[_T]): ...

and use it as MyDist[SomeConcreteType], but this fails because Callable enforces a specific usage pattern MyDist[[arg_type, ...], return_type].
On the other hand, introspection tools (in my experience) and the built-in callable already pick up the "callability" from the __call__ method.

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