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common/parser: handle reasoning budget (#20297)

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* v1

* Finished!

* Handlie cli

* Reasoning sampler

* Apply suggestions from code review

Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>

* Less explosive terminology :)

* Add utf-8 case and tests

* common : migrate reasoning budget sampler to common

* cont : clean up

* cont : expose state and allow passing as initial state

* cont : remove unused imports

* cont : update state machine doc string

---------

Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
Co-authored-by: Alde Rojas <hello@alde.dev>
This commit is contained in:
Piotr Wilkin (ilintar) 2026-03-11 10:26:12 +01:00 • committed by GitHub
parent 5f91b1d5d5
commit acb7c79069
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GPG key ID: B5690EEEBB952194
18 changed files with 670 additions and 10 deletions
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16
tools/server/server-common.cpp
View file

@ -1101,6 +1101,22 @@ json oaicompat_chat_params_parse(
llama_params["chat_parser"] = chat_params.parser;
}
// Reasoning budget: pass parameters through to sampling layer
{
int reasoning_budget = opt.reasoning_budget;
if (reasoning_budget == -1 && body.contains("thinking_budget_tokens")) {
reasoning_budget = json_value(body, "thinking_budget_tokens", -1);
}
if (reasoning_budget >= 0 && !chat_params.thinking_end_tag.empty()) {
llama_params["reasoning_budget_tokens"] = reasoning_budget;
llama_params["reasoning_budget_start_tag"] = chat_params.thinking_start_tag;
llama_params["reasoning_budget_end_tag"] = chat_params.thinking_end_tag;
llama_params["reasoning_budget_message"] = opt.reasoning_budget_message;
llama_params["reasoning_budget_activate_immediately"] = chat_params.thinking_forced_open;
}
}
// Handle "logprobs" field
// TODO: The response format of this option is not yet OAI-compatible, but seems like no one really using it; We may need to fix it in the future
if (json_value(body, "logprobs", false)) {

2
tools/server/server-common.h
View file

@ -287,6 +287,8 @@ struct server_chat_params {
bool allow_image;
bool allow_audio;
bool enable_thinking = true;
int reasoning_budget = -1;
std::string reasoning_budget_message;
std::string media_path;
};

7
tools/server/server-context.cpp
View file

@ -893,9 +893,10 @@ private:
}
// thinking is enabled if:
// 1. It's not explicitly disabled (reasoning_budget == 0)
// 1. It's not explicitly disabled via --reasoning off
// 2. The chat template supports it
const bool enable_thinking = params_base.use_jinja && params_base.reasoning_budget != 0 && common_chat_templates_support_enable_thinking(chat_templates.get());
const bool template_supports_thinking = params_base.use_jinja && common_chat_templates_support_enable_thinking(chat_templates.get());
const bool enable_thinking = params_base.enable_reasoning != 0 && template_supports_thinking;
SRV_INF("%s: chat template, thinking = %d\n", __func__, enable_thinking);
chat_params = {
@ -907,6 +908,8 @@ private:
/* allow_image */ mctx ? mtmd_support_vision(mctx) : false,
/* allow_audio */ mctx ? mtmd_support_audio (mctx) : false,
/* enable_thinking */ enable_thinking,
/* reasoning_budget */ params_base.reasoning_budget,
/* reasoning_budget_msg */ params_base.reasoning_budget_message,
/* media_path */ params_base.media_path,
};
}

28
tools/server/server-task.cpp
View file

@ -462,6 +462,34 @@ task_params server_task::params_from_json_cmpl(
}
}
// Parse reasoning budget sampler parameters
{
const int32_t budget = json_value(data, "reasoning_budget_tokens", (int32_t) -1);
if (budget >= 0) {
const auto start_tag = json_value(data, "reasoning_budget_start_tag", std::string());
const auto end_tag = json_value(data, "reasoning_budget_end_tag", std::string());
const auto message = json_value(data, "reasoning_budget_message", std::string());
const bool activate_imm = json_value(data, "reasoning_budget_activate_immediately", false);
params.sampling.reasoning_budget_tokens = budget;
params.sampling.reasoning_budget_activate_immediately = activate_imm;
if (!start_tag.empty()) {
params.sampling.reasoning_budget_start = common_tokenize(vocab, start_tag, false, true);
}
if (!end_tag.empty()) {
params.sampling.reasoning_budget_end = common_tokenize(vocab, end_tag, false, true);
params.sampling.reasoning_budget_forced = common_tokenize(vocab, message + end_tag, false, true);
}
SRV_DBG("reasoning budget: tokens=%d, activate_immediately=%s, start=%zu toks, end=%zu toks, forced=%zu toks\n",
budget, activate_imm ? "true" : "false",
params.sampling.reasoning_budget_start.size(),
params.sampling.reasoning_budget_end.size(),
params.sampling.reasoning_budget_forced.size());
}
}
{
params.sampling.logit_bias.clear();