Flash attention #2708

Job	Run time
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	2m 23s
build-and-test-cpp-aarch64 (openblas)	2m 45s
build-and-push-docker-images	36m 12s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	2m 2s
build-python-wheels (ubuntu-20.04, auto64)	12m 48s
build-and-test-cpp-x86_64 (macos-11, mkl)	2m 22s
build-python-wheels (macos-11, auto64)	12m 41s
build-and-test-cpp-x86_64 (macos-11, dnnl)	2m 20s
build-python-wheels (windows-2019, auto64)	14m 21s
check-python-style	14s
build-python-wheels (ubuntu-20.04, aarch64)	12m 26s
build-python-wheels (macos-11, arm64)	12m 39s
build-and-deploy-docs	0s
test-python-wheels	0s
publish-python-wheels-on-pypi	0s
	1h 53m 13s

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