pt: refact training code #5846

Job	Run time
determine-arm64-runner	1s
Build source distribution	21s
Build wheels for cp311-manylinux_x86_64	5m 38s
Build wheels for cp311-manylinux_x86_64	6m 11s
Build wheels for cp311-macosx_x86_64	6m 59s
Build wheels for cp311-macosx_arm64	4m 22s
Build wheels for cp311-win_amd64	6m 53s
Build wheels for cp310-manylinux_aarch64	5m 31s
build_pypi_index	9s
build_docker (12)	3m 45s
build_docker (_cu11, 11)	4m 4s
upload_pypi	0s
deploy_pypi_index	0s
Pass testing build wheels	3s
	43m 57s

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