David Novotny 5b74911881 NeRF training stats logger.
Summary: Implements the `Stats` class that handles logging of the training statistics.

Reviewed By: nikhilaravi

Differential Revision: D25684430

fbshipit-source-id: 920a1c65917ab5d047988494d92173da60cfd64b
2021-02-02 05:45:40 -08:00
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2021-02-02 05:45:40 -08:00