Support flashinfer for Gemma3 prefill #3167
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Gemma3 uses bidirectional attention for images. Flashinfer supports custom masks. Hook up the mask with flashinfer, so that we do not have to use the slower SDPA implementation for prefills with images.
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What does this PR do?
Gemma3 uses bidirectional attention for images. Flashinfer supports custom masks. Hook up the mask with flashinfer, so that we do not have to use the slower SDPA implementation for prefills with images.
Fixes #3105.
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