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Add prefill API to MultimodalRunner #14489

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Merged
merged 1 commit into from
Sep 23, 2025
Merged

Add prefill API to MultimodalRunner #14489

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10 changes: 10 additions & 0 deletions extension/llm/runner/multimodal_runner.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,16 @@ Error MultimodalRunner::load() {
ET_LOG(Info, format, __VA_ARGS__); \
}

Error MultimodalRunner::prefill(std::vector<MultimodalInput>& inputs) {
if (!is_loaded()) {
ET_CHECK_OK_OR_RETURN_ERROR(load());
}
for (auto& input : inputs) {
ET_UNWRAP(multimodal_prefiller_->prefill(input, pos_));
}
return Error::Ok;
}

Error MultimodalRunner::generate(
const std::vector<MultimodalInput>& inputs,
const GenerationConfig& config,
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9 changes: 9 additions & 0 deletions extension/llm/runner/multimodal_runner.h
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Expand Up @@ -119,6 +119,15 @@ class ET_EXPERIMENTAL MultimodalRunner {
std::function<void(const std::string&)> token_callback = {},
std::function<void(const Stats&)> stats_callback = {});

/**
* Prefill multimodal inputs, for example to reload chat history.
* @param inputs A vector of MultimodalInput objects containing images and
* text.
* @return The error code. KV cache position is tracked internally in pos_.
*/
virtual ::executorch::runtime::Error prefill(
std::vector<MultimodalInput>& inputs);

inline void stop() {
text_token_generator_->stop();
}
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