Fix: always output weighted average error #6

Job	Run time
determine-arm64-runner	1s
Build source distribution	13s
Build wheels for cp311-manylinux_x86_64	6m 12s
Build wheels for cp311-manylinux_x86_64	5m 57s
Build wheels for cp311-macosx_x86_64	6m 15s
Build wheels for cp311-macosx_arm64	3m 2s
Build wheels for cp311-win_amd64	6m 26s
Build wheels for cp310-manylinux_aarch64	29m 31s
build_pypi_index	9s
build_docker (12)	2m 23s
build_docker (_cu11, 11)	3m 6s
upload_pypi	0s
deploy_pypi_index	0s
Pass testing build wheels	2s
	1h 3m 17s

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