Fix #3186 - create leaf/non-leaf/requires_grad/retain_grad tutorial #4969

Job	Run time
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	38m 11s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	39m 36s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	15m 40s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	29m 26s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	32m 16s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	23m 31s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	16m 59s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	16m 24s
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	15m 3s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	24m 22s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	23m 14s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	15m 1s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	18m 37s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	19m 28s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	28m 31s
pytorch_tutorial_build_manager	21m 27s
	6h 17m 46s

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