fix gemma bug #2728

Job	Run time
check-python-style	8s
build-python-wheels (ubuntu-20.04, auto64)	2h 0m 24s
build-python-wheels (macos-11, auto64)	43m 43s
build-python-wheels (windows-2019, auto64)	5h 31m 33s
build-and-test-cpp-aarch64 (openblas)	4m 19s
build-python-wheels (ubuntu-20.04, aarch64)	1h 15m 1s
build-and-push-docker-images	1h 51m 1s
build-python-wheels (macos-11, arm64)	21m 56s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	5m 38s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	5m 28s
build-and-test-cpp-x86_64 (macos-11, mkl)	11m 4s
build-and-test-cpp-x86_64 (macos-11, dnnl)	9m 36s
build-and-deploy-docs	1m 15s
test-python-wheels (ubuntu-20.04)	10m 30s
test-python-wheels (macos-11)	3m 59s
test-python-wheels (windows-2019)	4m 55s
publish-python-wheels-on-pypi	0s
	12h 40m 30s

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