Small improvements #2911

Job	Run time
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	6m 27s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	5m 59s
build-python-wheels (ubuntu-20.04, auto64)	35m 34s
build-python-wheels (windows-2019, auto64)	47m 17s
build-and-test-cpp-aarch64 (openblas)	4m 19s
build-python-wheels (ubuntu-20.04, aarch64)	1h 22m 24s
build-and-push-docker-images	29m 46s
build-python-wheels (macos-12, arm64)	10m 29s
check-python-style	8s
test-python-wheels (ubuntu-20.04)	7m 27s
test-python-wheels (windows-2019)	5m 46s
build-and-deploy-docs	0s
publish-python-wheels-on-pypi	0s
	3h 55m 36s

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