Changed hyperparam configuration in the DQN tutorial #4515

Job	Run time
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	39m 38s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	41m 14s
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	16m 30s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	23m 46s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	21m 3s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	22m 6s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	18m 8s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	19m 9s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	28m 49s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	23m 40s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	24m 42s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	30m 35s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	17m 3s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	27m 44s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	36m 43s
pytorch_tutorial_build_manager	23m 51s
	6h 54m 41s

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