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ba2dfbb0 - [Misc] Make MM embedding merge interface explicit in model runner (#21147)

[Misc] Make MM embedding merge interface explicit in model runner (#21147) Signed-off-by: Roger Wang <hey@rogerw.me> Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>