Add Foreach_map tutorial (#3318) #4215

Job	Run time
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	17m 18s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	35m 21s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	18m 55s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	17m 5s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	21m 58s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	25m 17s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	19m 47s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	29m 58s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	17m 23s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	20m 36s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	31m 43s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	26m 0s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	29m 53s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	37m 28s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	24m 17s
pytorch_tutorial_build_manager	24m 44s
	6h 37m 43s

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