remove unused import #2981

Job	Run time
build-and-test-cpp-aarch64 (openblas)	4m 18s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	6m 15s
build-and-push-docker-images	29m 27s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	5m 47s
build-python-wheels (ubuntu-20.04, auto64)	35m 35s
check-python-style	7s
build-python-wheels (windows-2019, auto64)	45m 29s
build-python-wheels (ubuntu-20.04, aarch64)	1h 34m 4s
build-python-wheels (macos-13, arm64)	8m 18s
build-and-deploy-docs	25s
test-python-wheels (ubuntu-20.04)	9m 25s
test-python-wheels (windows-2019)	4m 37s
publish-python-wheels-on-pypi	0s
	4h 3m 47s

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