[Fix] Fix conflict of downloading dataset #3020

Job	Run time
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	13m 23s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	53m 51s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	17m 33s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	24m 31s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	17m 40s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	15m 3s
pytorch_tutorial_build_worker (7, 15, linux.4xlarge.nvidia.gpu)	18m 51s
pytorch_tutorial_build_worker (8, 15, linux.4xlarge.nvidia.gpu)	17m 27s
pytorch_tutorial_build_worker (9, 15, linux.4xlarge.nvidia.gpu)	31m 53s
pytorch_tutorial_build_worker (10, 15, linux.4xlarge.nvidia.gpu)	22m 33s
pytorch_tutorial_build_worker (11, 15, linux.4xlarge.nvidia.gpu)	38m 10s
pytorch_tutorial_build_worker (12, 15, linux.4xlarge.nvidia.gpu)	18m 24s
pytorch_tutorial_build_worker (13, 15, linux.4xlarge.nvidia.gpu)	18m 4s
pytorch_tutorial_build_worker (14, 15, linux.4xlarge.nvidia.gpu)	11m 38s
pytorch_tutorial_build_worker (15, 15, linux.4xlarge.nvidia.gpu)	19m 12s
pytorch_tutorial_build_manager	18m 3s
	5h 56m 16s

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