Move back to 2.7 #4296

Job	Run time
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	16m 3s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	12m 20s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	16m 13s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	17m 53s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	12m 25s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	16m 4s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	12m 0s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	10m 56s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	11m 2s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	11m 30s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	11m 57s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	12m 12s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	11m 10s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	11m 53s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	11m 49s
pytorch_tutorial_build_manager	1s
	3h 15m 28s

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