disable the ut test_dist_mnist_hallreduce temporarily #28129
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kolinwei
approved these changes
Oct 20, 2020
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临时禁用单测test_dist_mnist_hallreduce
原因是CI系统机器只有2块GPU卡，而该单测创建的nccl rank数为4（4个进程），因此会出现单张GPU卡上存在多个rank的情况。但高版本nccl不支持这一情况： Using the same CUDA device multiple times as different ranks of the same NCCL communicator is not supported and may lead to hangs.
升级ci docker镜像的pr：#27589