added autoencoders tutorial #2647

Job	Run time
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	15m 16s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	51m 11s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	20m 9s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	28m 57s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	20m 56s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	19m 54s
pytorch_tutorial_build_worker (7, 15, linux.4xlarge.nvidia.gpu)	22m 13s
pytorch_tutorial_build_worker (8, 15, linux.4xlarge.nvidia.gpu)	17m 12s
pytorch_tutorial_build_worker (9, 15, linux.4xlarge.nvidia.gpu)	19m 21s
pytorch_tutorial_build_worker (10, 15, linux.4xlarge.nvidia.gpu)	35m 47s
pytorch_tutorial_build_worker (11, 15, linux.4xlarge.nvidia.gpu)	46m 55s
pytorch_tutorial_build_worker (12, 15, linux.4xlarge.nvidia.gpu)	31m 56s
pytorch_tutorial_build_worker (13, 15, linux.4xlarge.nvidia.gpu)	39m 20s
pytorch_tutorial_build_worker (14, 15, linux.4xlarge.nvidia.gpu)	23m 21s
pytorch_tutorial_build_worker (15, 15, linux.4xlarge.nvidia.gpu)	13m 44s
pytorch_tutorial_build_manager	20m 3s
	7h 6m 15s

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