pt: refact training code #5872

Job	Run time
Build source distribution	23s
determine-arm64-runner	1s
Build wheels for cp311-manylinux_x86_64	5m 28s
Build wheels for cp311-manylinux_x86_64	5m 59s
Build wheels for cp311-macosx_x86_64	5m 11s
Build wheels for cp311-macosx_arm64	4m 22s
Build wheels for cp311-win_amd64	7m 43s
Build wheels for cp310-manylinux_aarch64	5m 24s
build_pypi_index	13s
build_docker (12)	4m 0s
build_docker (_cu11, 11)	3m 25s
upload_pypi	0s
deploy_pypi_index	0s
Pass testing build wheels	1s
	42m 10s

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