Fix DQN w RNN tutorial #4832

Job	Run time
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	18m 37s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	35m 25s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	16m 32s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	14m 12s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	21m 17s
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	14m 31s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	38m 57s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	22m 32s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	18m 9s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	14m 22s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	26m 54s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	27m 1s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	19m 4s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	24m 29s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	32m 41s
pytorch_tutorial_build_manager	22m 4s
	6h 6m 47s

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