Lumpiasty/llama.cpp
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server: correct accepted tokens when need draft token replay (#26320)

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* spec: correct accepted tokens when need draft token replay

* cont : naming

---------

Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
This commit is contained in:
Ruixiang Wang
2026-07-31 11:16:17 +03:00
committed by GitHub
co-authored by Georgi Gerganov
parent 15e755f30d
commit 000547513f
1 changed files with 13 additions and 3 deletions
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tools/server/server-context.cpp
+13 -3
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@@ -212,6 +212,7 @@ struct server_slot {
llama_tokens spec_prompt;
std::vector<int32_t> spec_i_batch;
common_prompt_checkpoint spec_ckpt;
bool spec_is_replay = false;
// TODO: move members that belong to the task (such as `generated_text`, `has_new_line`) to task_results_state
// see https://github.com/ggml-org/llama.cpp/pull/18283#issuecomment-3710175837
@@ -332,6 +333,8 @@ struct server_slot {
void reset() {
SLT_DBG(*this, "%s", "\n");
spec_is_replay = false;
n_prompt_tokens_cache = 0;
last_nl_pos = 0;
@@ -3875,6 +3878,7 @@ private:
}
// partial acceptance is not supported by the context -> truncate the draft and restore the state
slot.spec_is_replay = true;
slot.spec_draft = std::move(accepted);
const auto & ckpt = slot.spec_ckpt;
@@ -3909,16 +3913,22 @@ private:
const auto ids = std::move(slot.spec_draft);
size_t n_accepted = ids.size() - 1;
if (slot.spec_is_replay && n_accepted > 0) {
n_accepted--;
}
slot.spec_is_replay = false;
slot.t_token_generation = std::max<int64_t>(1, t_now - slot.t_start_generation) / 1e3;
// update how many tokens out of those tested were accepted
slot.n_draft_accepted += ids.size() - 1;
slot.n_draft_accepted += n_accepted;
slot.n_draft_verif_steps += 1;
if (slot.n_accepted_per_pos.empty()) {
slot.n_accepted_per_pos.resize(common_speculative_n_max(&params_base.speculative), 0);
}
for (size_t i = 0; i < ids.size() - 1 && i < slot.n_accepted_per_pos.size(); ++i) {
for (size_t i = 0; i < n_accepted && i < slot.n_accepted_per_pos.size(); ++i) {
slot.n_accepted_per_pos[i]++;
}
@@ -3954,7 +3964,7 @@ private:
slot.print_timings_tg();
SLT_DBG(slot, "accepted %d/%d draft tokens, new n_tokens = %d\n", (int) ids.size() - 1, (int) n_draft, slot.prompt.n_tokens());
SLT_DBG(slot, "accepted %d/%d draft tokens, new n_tokens = %d\n", (int) n_accepted, (int) n_draft, slot.prompt.n_tokens());
});
}