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Summary: We need to make packing/unpacking in 2 places for mixed frame raysampling (metrics and raysampler) but those tensors that need to be unpacked/packed have more than two dimensions. I could have reshaped and stored dimensions but this seems to just complicate code there with something which packed_to_padded should support. I could have made a separate function for implicitron but it would confusing to have two different padded_to_packed functions inside pytorch3d codebase one of which does packing for (b, max) and (b, max, f) and the other for (b, max, …) Reviewed By: bottler Differential Revision: D39729026 fbshipit-source-id: 2bdebf290dcc6c316b7fe1aeee49bbb5255e508c