Move back to 2.7 #4311

Job	Run time
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	31m 10s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	31m 13s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	21m 37s
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	15m 6s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	15m 9s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	15m 56s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	25m 41s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	14m 29s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	20m 38s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	17m 24s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	18m 0s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	29m 0s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	26m 13s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	29m 8s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	20m 45s
pytorch_tutorial_build_manager	1s
	5h 31m 30s

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