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Fix paligemma: must subtract image tokens from prompt length #831

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copybara-service merged 1 commit into from
Feb 5, 2026
+1 −1
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Fix paligemma: must subtract image tokens from prompt length #831

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2 changes: 1 addition & 1 deletion gemma/run.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -200,7 +200,7 @@ void ReplGemma(const GemmaArgs& args, const Gemma& gemma, KVCache& kv_cache,
config.wrapping, abs_pos, prompt_string,
image_tokens.Rows());
runtime_config.image_tokens = &image_tokens;
prompt_size = prompt.size();
prompt_size = prompt.size() - image_tokens.Rows();
if (config.wrapping == PromptWrapping::PALIGEMMA) {
// The end of the prefix for prefix-LM style attention in Paligemma.
// See Figure 2 of https://arxiv.org/abs/2407.07726.
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