[#537] Enhance the nanoGPT Guide #1624

Job	Run time
atorch-python-test	6m 39s
brain-test	2m 57s
atorch-pre-commit	4m 20s
dlrover-client-test	2m 40s
dlrover-python-test	3m 49s
dlrover-system-test-criteo-deeprec	3m 31s
dlrover-system-test-tf2	2m 0s
dlrover-system-test-deepfm	3m 27s
dlrover-trainer-test	2m 48s
operator-test	2m 24s
pre-commit	2m 9s
tfplus-pre-commit	1m 5s
tfplus-python-test	1m 4s
	38m 53s

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