Fix DQN w RNN tutorial #4947

Job	Run time
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	37m 57s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	24m 34s
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	17m 24s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	30m 53s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	24m 15s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	16m 40s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	34m 3s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	16m 38s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	18m 7s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	20m 56s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	15m 14s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	22m 50s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	20m 14s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	37m 4s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	26m 6s
pytorch_tutorial_build_manager	0s
	6h 2m 55s

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