Fix DQN w RNN tutorial #4844

Job	Run time
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	37m 40s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	22m 31s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	34m 44s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	20m 8s
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	15m 55s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	20m 34s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	19m 35s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	14m 32s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	28m 30s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	26m 18s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	15m 35s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	17m 56s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	29m 16s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	28m 59s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	24m 18s
pytorch_tutorial_build_manager	0s
	5h 56m 31s

Provide feedback