Move back to use stable binaries 2.7. #4284

Job	Run time
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	7m 34s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	9m 32s
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	9m 37s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	9m 7s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	9m 2s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	9m 14s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	9m 11s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	9m 11s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	9m 10s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	9m 6s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	9m 16s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	9m 19s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	6m 49s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	9m 13s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	9m 9s
pytorch_tutorial_build_manager	1s
	2h 14m 31s

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