Move back to use stable binaries 2.7. #4271

Job	Run time
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	9m 36s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	6m 59s
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	7m 18s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	8m 59s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	9m 59s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	9m 15s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	9m 12s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	8m 51s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	6m 16s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	9m 1s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	6m 50s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	9m 14s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	7m 11s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	9m 3s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	6m 13s
pytorch_tutorial_build_manager	0s
	2h 3m 57s

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