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Shoufa Chen authored
* copy-paste friendly * fix import container_abcs issue Nightly PyTorch has removed `container_abcs` from `torch._six`. https://github.com/pytorch/pytorch/commit/58eb23378f2a376565a66ac32c93a316c45b6131#diff-b3c160475f0fbe8ad50310f92d3534172ba98203387a962b7dc8f4a23b15cf4dL35 * fix import container_abcs issue Nightly PyTorch has removed `container_abcs` from `torch._six`. https://github.com/pytorch/pytorch/commit/58eb23378f2a376565a66ac32c93a316c45b6131#diff-b3c160475f0fbe8ad50310f92d3534172ba98203387a962b7dc8f4a23b15cf4dL35 * keep existing for pytorch1.7 and earlier
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