[DateLoader] more clearly expose 'default_collate' and 'default_convert' to users (#69862)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69862
Fixes #69445
cc SsnL VitalyFedyunin ejguan NivekT
Test Plan: Imported from OSS
Reviewed By: ejguan, ngimel
Differential Revision: D33068792
Pulled By: NivekT
fbshipit-source-id: ef9791acdc23d014b8761fa7420062d454ce8969
