pt: refact training code #5876

Job	Run time
Build source distribution	20s
determine-arm64-runner	1s
Build wheels for cp311-manylinux_x86_64	5m 47s
Build wheels for cp311-manylinux_x86_64	6m 32s
Build wheels for cp311-macosx_x86_64	5m 58s
Build wheels for cp311-macosx_arm64	4m 8s
Build wheels for cp311-win_amd64	7m 9s
Build wheels for cp310-manylinux_aarch64	5m 30s
build_pypi_index	11s
build_docker (12)	4m 3s
build_docker (_cu11, 11)	4m 14s
upload_pypi	0s
deploy_pypi_index	0s
Pass testing build wheels	1s
	43m 54s

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