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Summary: Changed ray_sampler and metrics to be able to use mixed frame raysampling. Ray_sampler now has a new member which it passes to the pytorch3d raysampler. If the raybundle is heterogeneous metrics now samples images by padding xys first. This reduces memory consumption. Reviewed By: bottler, kjchalup Differential Revision: D39542221 fbshipit-source-id: a6fec23838d3049ae5c2fd2e1f641c46c7c927e3