Chore: remove grad from nlist linear model #10177

Job	Run time
determine-arm64-runner	1s
Build source distribution	9s
Build wheels for cp311-manylinux_x86_64	6m 7s
Build wheels for cp311-manylinux_x86_64	5m 52s
Build wheels for cp311-macosx_x86_64	7m 16s
Build wheels for cp311-macosx_arm64	4m 32s
Build wheels for cp311-win_amd64	5m 7s
Build wheels for cp310-manylinux_aarch64	6m 20s
build_pypi_index	23s
build_docker (12)	2m 20s
build_docker (_cu11, 11)	2m 42s
upload_pypi	0s
deploy_pypi_index	0s
Pass testing build wheels	1s
	40m 50s

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