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Summary: One step in finding all the pairs of vertices which share faces is a simple calculation but annoying to parallelize. It was implemented in pure Python. We move it to C++. We still pull the data to the CPU and put the answer back on the device. Reviewed By: nikhilaravi, gkioxari Differential Revision: D26073475 fbshipit-source-id: ffbf4e2c347a511ab5084bceff600465812b6a52