pt: refact training code #5877

Job	Run time
Build source distribution	12s
determine-arm64-runner	1s
Build wheels for cp311-manylinux_x86_64	7m 40s
Build wheels for cp311-manylinux_x86_64	5m 43s
Build wheels for cp311-macosx_x86_64	5m 43s
Build wheels for cp311-macosx_arm64	4m 36s
Build wheels for cp311-win_amd64	6m 21s
Build wheels for cp310-manylinux_aarch64	5m 28s
build_pypi_index	7s
build_docker (12)	3m 49s
build_docker (_cu11, 11)	3m 50s
upload_pypi	0s
deploy_pypi_index	0s
Pass testing build wheels	2s
	43m 32s

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