Optimize Gemma 4 MoE router input buffering and scaling:#965
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Optimize Gemma 4 MoE router input buffering and scaling:#965copybara-service[bot] wants to merge 1 commit into
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- Changed `router_in` storage type from `BF16` to `float` in `Activations` to avoid `BF16`->`float`->`BF16` round-tripping. - Copies pre-FFW activations directly to the `float` `router_in` without type conversion. - Precomputes `scale_factor * router_scale` once per-layer instead of repeating the computation per-token in the nested loops. PiperOrigin-RevId: 954067115
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Optimize Gemma 4 MoE router input buffering and scaling:
router_instorage type fromBF16tofloatinActivationsto avoidBF16->float->BF16round-tripping.floatrouter_inwithout type conversion.scale_factor * router_scaleonce per-layer instead of repeating the computation per-token in the nested loops.