Update ax_multiobjective_nas_tutorial.py to use TensorboardMetric (#2… #2621

Job	Run time
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	15m 18s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	51m 57s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	19m 12s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	28m 28s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	20m 0s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	16m 59s
pytorch_tutorial_build_worker (7, 15, linux.4xlarge.nvidia.gpu)	18m 7s
pytorch_tutorial_build_worker (8, 15, linux.4xlarge.nvidia.gpu)	15m 43s
pytorch_tutorial_build_worker (9, 15, linux.4xlarge.nvidia.gpu)	34m 17s
pytorch_tutorial_build_worker (10, 15, linux.4xlarge.nvidia.gpu)	41m 53s
pytorch_tutorial_build_worker (11, 15, linux.4xlarge.nvidia.gpu)	31m 46s
pytorch_tutorial_build_worker (12, 15, linux.4xlarge.nvidia.gpu)	18m 6s
pytorch_tutorial_build_worker (13, 15, linux.4xlarge.nvidia.gpu)	20m 46s
pytorch_tutorial_build_worker (14, 15, linux.4xlarge.nvidia.gpu)	14m 42s
pytorch_tutorial_build_worker (15, 15, linux.4xlarge.nvidia.gpu)	19m 34s
pytorch_tutorial_build_manager	19m 23s
	6h 26m 11s

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