Move back to 2.7 #4321

Job	Run time
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	19m 37s
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	12m 51s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	34m 57s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	32m 53s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	22m 35s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	27m 48s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	17m 44s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	29m 22s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	20m 31s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	26m 28s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	14m 19s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	14m 52s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	16m 11s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	26m 3s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	22m 24s
pytorch_tutorial_build_manager	23m 15s
	6h 1m 50s

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