pt: refact training code #5867

Job	Run time
determine-arm64-runner	1s
Build source distribution	19s
Build wheels for cp311-manylinux_x86_64	5m 43s
Build wheels for cp311-manylinux_x86_64	6m 0s
Build wheels for cp311-macosx_x86_64	5m 48s
Build wheels for cp311-macosx_arm64	3m 20s
Build wheels for cp311-win_amd64	4m 43s
Build wheels for cp310-manylinux_aarch64	5m 34s
build_pypi_index	11s
build_docker (12)	3m 48s
build_docker (_cu11, 11)	3m 38s
upload_pypi	0s
deploy_pypi_index	0s
Pass testing build wheels	2s
	39m 7s

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