Jeremy Reizenstein f00ef66727 NeRF training: avoid caching unused visualization data.
Summary: If we are not visualizing the training with visdom, then there are a couple of outputs of the coarse rendering step which are not small and are returned by the renderer but never used. We don't need to bother transferring them to the CPU.

Reviewed By: nikhilaravi

Differential Revision: D28939958

fbshipit-source-id: 7e0d6681d6524f7fb57b6b20164580006120de80
2021-06-08 04:35:22 -07:00
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