remove unused import #2979

Job	Run time
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	6m 3s
build-and-test-cpp-aarch64 (openblas)	4m 21s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	5m 59s
check-python-style	8s
build-python-wheels (ubuntu-20.04, auto64)	35m 8s
build-and-push-docker-images	29m 39s
build-python-wheels (windows-2019, auto64)	47m 24s
build-python-wheels (ubuntu-20.04, aarch64)	1h 32m 19s
build-python-wheels (macos-13, arm64)	10m 37s
test-python-wheels (ubuntu-20.04)	5m 10s
build-and-deploy-docs	0s
test-python-wheels (windows-2019)	4m 11s
publish-python-wheels-on-pypi	0s
	4h 0m 59s

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