Move back to 2.7 #4312

Job	Run time
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	15m 30s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	27m 21s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	27m 20s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	15m 16s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	29m 29s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	22m 35s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	11m 47s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	17m 34s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	16m 27s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	21m 33s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	20m 35s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	17m 25s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	27m 3s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	22m 58s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	26m 17s
pytorch_tutorial_build_manager	1s
	5h 19m 11s

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