Clean bf16 build warnings

[cydrain]

see build warnings, need fix

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions. Rotten issues close after 30d of inactivity. Reopen the issue with /reopen.

[liliu-z]

/reopen

[sre-ci-robot]

@liliu-z: Reopened this issue.

In response to this:

/reopen

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[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions. Rotten issues close after 30d of inactivity. Reopen the issue with /reopen.