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Fix multi-GPU hang on graph generation (#1572)
Two bug fixes for multi-GPU graph creation. - Add barrier to avoid overlap between different communicators - NCCL bug workaround on DGX1 Authors: - Seunghwa Kang (https://github.com/seunghwak) Approvers: - Rick Ratzel (https://github.com/rlratzel) - Andrei Schaffer (https://github.com/aschaffer) - Brad Rees (https://github.com/BradReesWork) URL: #1572
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