mirror of
https://github.com/ggml-org/llama.cpp.git
synced 2025-11-03 09:22:01 +00:00
367 lines
15 KiB
C++
367 lines
15 KiB
C++
/*
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Copyright 2024 Google LLC
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Use of this source code is governed by an MIT-style
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license that can be found in the LICENSE file or at
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https://opensource.org/licenses/MIT.
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*/
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// SPDX-License-Identifier: MIT
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#pragma once
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#include "minja.hpp"
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#include <json.hpp>
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#include <string>
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#include <vector>
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using json = nlohmann::ordered_json;
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namespace minja {
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struct chat_template_caps {
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bool supports_tools = false;
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bool supports_tool_calls = false;
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bool supports_tool_responses = false;
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bool supports_system_role = false;
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bool supports_parallel_tool_calls = false;
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bool supports_tool_call_id = false;
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// meta-llama/Llama-3.1-8B-Instruct expects arguments to be an object.
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// Most other templates (and OpenAI's API) expect the arguments object to be stringified.
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bool requires_object_arguments = false;
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// CohereForAI/c4ai-command-r-plus simple variant
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bool requires_non_null_content = false;
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// MiniMaxAI/MiniMax-Text-01 special
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bool requires_typed_content = false;
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};
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class chat_template {
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private:
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chat_template_caps caps_;
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std::string source_;
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std::string bos_token_;
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std::string eos_token_;
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std::shared_ptr<minja::TemplateNode> template_root_;
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std::string try_raw_render(
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const nlohmann::ordered_json & messages,
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const nlohmann::ordered_json & tools,
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bool add_generation_prompt,
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const nlohmann::ordered_json & extra_context = nlohmann::ordered_json()) const
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{
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try {
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auto prompt = apply(messages, tools, add_generation_prompt, extra_context, /* adjust_inputs= */ false);
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// fprintf(stderr, "try_raw_render: %s\n", prompt.c_str());
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return prompt;
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} catch (const std::exception & e) {
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// fprintf(stderr, "try_raw_render error: %s\n", e.what());
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return "";
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}
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}
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public:
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chat_template(const std::string & source, const std::string & bos_token, const std::string & eos_token)
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: source_(source), bos_token_(bos_token), eos_token_(eos_token)
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{
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template_root_ = minja::Parser::parse(source_, {
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/* .trim_blocks = */ true,
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/* .lstrip_blocks = */ true,
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/* .keep_trailing_newline = */ false,
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});
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auto contains = [](const std::string & haystack, const std::string & needle) {
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return haystack.find(needle) != std::string::npos;
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};
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const std::string user_needle = "<User Needle>";
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const std::string sys_needle = "<System Needle>";
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const json dummy_str_user_msg = {{"role", "user"}, {"content", user_needle}};
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const json dummy_typed_user_msg = {{"role", "user"}, {"content", json::array({{{"type", "text"}, {"text", user_needle}}})}};
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caps_.requires_typed_content =
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!contains(try_raw_render(json::array({dummy_str_user_msg}), {}, false), user_needle)
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&& contains(try_raw_render(json::array({dummy_typed_user_msg}), {}, false), user_needle);
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const auto dummy_user_msg = caps_.requires_typed_content
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? dummy_typed_user_msg
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: dummy_str_user_msg;
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const json needle_system_msg = {
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{"role", "system"},
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{"content", caps_.requires_typed_content ? json::array({{{"type", "text"}, {"text", sys_needle}}}) : json(sys_needle)},
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};
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caps_.supports_system_role = contains(try_raw_render({needle_system_msg, dummy_user_msg,}, {}, false), sys_needle);
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auto out = try_raw_render(json::array({
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dummy_user_msg
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}), json::array({
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{
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{"name", "some_tool"},
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{"type", "function"},
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{"function", {
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{"name", "some_tool"},
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{"description", "Some tool."},
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{"parameters", {
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{"type", "object"},
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{"properties", {
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{"arg", {
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{"type", "string"},
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{"description", "Some argument."},
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}},
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}},
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{"required", json::array({ "arg" })},
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}},
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}},
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},
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}), false);
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caps_.supports_tools = contains(out, "some_tool");
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auto make_tool_calls_msg = [&](const json & tool_calls) {
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return json {
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{"role", "assistant"},
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{"content", nullptr},
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{"tool_calls", tool_calls},
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};
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};
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auto make_tool_call = [](const std::string & tool_name, const json & arguments) {
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return json {
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{"id", "call_1___"},
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{"type", "function"},
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{"function", {
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{"arguments", arguments},
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{"name", tool_name},
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}},
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};
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};
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const json dummy_args_obj {{"argument_needle", "print('Hello, World!')"}};
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// Note: the arguments are rendered in both cases, but may be double-escaped, which we don't want.
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out = try_raw_render(json::array({
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dummy_user_msg,
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make_tool_calls_msg(json::array({make_tool_call("ipython", dummy_args_obj.dump())})),
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}), {}, false);
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auto tool_call_renders_str_arguments = contains(out, "\"argument_needle\":") || contains(out, "'argument_needle':");
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out = try_raw_render(json::array({
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dummy_user_msg,
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make_tool_calls_msg(json::array({make_tool_call("ipython", dummy_args_obj)})),
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}), {}, false);
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auto tool_call_renders_obj_arguments = contains(out, "\"argument_needle\":") || contains(out, "'argument_needle':");
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caps_.supports_tool_calls = tool_call_renders_str_arguments || tool_call_renders_obj_arguments;
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caps_.requires_object_arguments = !tool_call_renders_str_arguments && tool_call_renders_obj_arguments;
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auto out_empty = try_raw_render(json::array({dummy_user_msg, {{"role", "assistant"}, {"content", ""}}}), {}, false);
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auto out_null = try_raw_render(json::array({dummy_user_msg, {{"role", "assistant"}, {"content", nullptr}}}), {}, false);
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caps_.requires_non_null_content = contains(out_empty, user_needle) && !contains(out_null, user_needle);
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if (caps_.supports_tool_calls) {
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auto dummy_args = caps_.requires_object_arguments ? dummy_args_obj : json(dummy_args_obj.dump());
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auto tc1 = make_tool_call("test_tool1", dummy_args);
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auto tc2 = make_tool_call("test_tool2", dummy_args);
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auto out = try_raw_render(json::array({
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dummy_user_msg,
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make_tool_calls_msg(json::array({tc1, tc2})),
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}), {}, false);
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caps_.supports_parallel_tool_calls = contains(out, "test_tool1") && contains(out, "test_tool2");
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out = try_raw_render(json::array({
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dummy_user_msg,
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make_tool_calls_msg(json::array({tc1})),
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{
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{"role", "tool"},
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{"name", "test_tool1"},
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{"content", "Some response!"},
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{"tool_call_id", "call_911_"},
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}
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}), {}, false);
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caps_.supports_tool_responses = contains(out, "Some response!");
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caps_.supports_tool_call_id = contains(out, "call_911_");
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}
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}
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const std::string & source() const { return source_; }
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const std::string & bos_token() const { return bos_token_; }
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const std::string & eos_token() const { return eos_token_; }
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const chat_template_caps & original_caps() const { return caps_; }
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std::string apply(
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const nlohmann::ordered_json & messages,
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const nlohmann::ordered_json & tools,
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bool add_generation_prompt,
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const nlohmann::ordered_json & extra_context = nlohmann::ordered_json(),
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bool adjust_inputs = true) const
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{
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json actual_messages;
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auto needs_adjustments = adjust_inputs && (false
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|| !caps_.supports_system_role
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|| !caps_.supports_tools
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|| !caps_.supports_tool_responses
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|| !caps_.supports_tool_calls
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|| caps_.requires_object_arguments
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|| caps_.requires_typed_content
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);
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if (needs_adjustments) {
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actual_messages = json::array();
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auto add_message = [&](const json & msg) {
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if (caps_.requires_typed_content && msg.contains("content") && !msg.at("content").is_null() && msg.at("content").is_string()) {
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actual_messages.push_back({
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{"role", msg.at("role")},
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{"content", {{
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{"type", "text"},
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{"text", msg.at("content")},
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}}},
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});
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} else {
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actual_messages.push_back(msg);
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}
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};
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std::string pending_system;
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auto flush_sys = [&]() {
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if (!pending_system.empty()) {
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add_message({
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{"role", "user"},
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{"content", pending_system},
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});
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pending_system.clear();
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}
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};
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auto needs_tools_in_system = !tools.is_null() && tools.size() > 0 && !caps_.supports_tools;
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for (const auto & message_ : needs_tools_in_system ? add_system(messages, "Available tools: " + tools.dump(2)) : messages) {
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auto message = message_;
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if (!message.contains("role") || !message.contains("content")) {
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throw std::runtime_error("message must have 'role' and 'content' fields: " + message.dump());
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}
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std::string role = message.at("role");
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if (message.contains("tool_calls")) {
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if (caps_.requires_object_arguments || !caps_.supports_tool_calls) {
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for (auto & tool_call : message.at("tool_calls")) {
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if (tool_call["type"] == "function") {
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auto & function = tool_call.at("function");
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auto & arguments = function.at("arguments");
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if (arguments.is_string()) {
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try {
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arguments = json::parse(arguments.get<std::string>());
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} catch (const std::exception & ecvt) {
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fprintf(stderr, "Failed to parse arguments: %s\n", ecvt.what());
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}
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}
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}
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}
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}
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if (!caps_.supports_tool_calls) {
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auto content = message.at("content");
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auto tool_calls = json::array();
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for (const auto & tool_call : message.at("tool_calls")) {
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if (tool_call.at("type") != "function") {
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continue;
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}
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const auto & function = tool_call.at("function");
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auto tc = json {
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{"name", function.at("name")},
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{"arguments", function.at("arguments")},
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};
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if (tool_call.contains("id")) {
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tc["id"] = tool_call["id"];
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}
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tool_calls.push_back(tc);
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}
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auto obj = json {
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{"tool_calls", tool_calls},
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};
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if (!content.is_null() && content != "") {
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obj["content"] = content;
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}
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message["content"] = obj.dump(2);
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message.erase("tool_calls");
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}
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}
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if (!caps_.supports_tool_responses && role == "tool") {
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message["role"] = "user";
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auto obj = json {
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{"tool_response", {
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{"tool", message.at("name")},
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{"content", message.at("content")},
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}},
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};
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if (message.contains("tool_call_id")) {
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obj["tool_response"]["tool_call_id"] = message.at("tool_call_id");
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}
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message["content"] = obj.dump(2);
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message.erase("name");
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}
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if (!message["content"].is_null() && !caps_.supports_system_role) {
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std::string content = message.at("content");
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if (role == "system") {
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if (!pending_system.empty()) pending_system += "\n";
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pending_system += content;
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continue;
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} else {
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if (role == "user") {
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if (!pending_system.empty()) {
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message["content"] = pending_system + (content.empty() ? "" : "\n" + content);
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pending_system.clear();
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}
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} else {
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flush_sys();
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}
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}
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}
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add_message(message);
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}
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if (!caps_.supports_system_role) {
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flush_sys();
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}
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} else {
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actual_messages = messages;
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}
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auto context = minja::Context::make(json({
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{"messages", actual_messages},
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{"add_generation_prompt", add_generation_prompt},
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{"bos_token", bos_token_},
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{"eos_token", eos_token_},
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}));
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if (!tools.is_null()) {
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auto tools_val = minja::Value(tools);
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context->set("tools", tools_val);
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}
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if (!extra_context.is_null()) {
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for (auto & kv : extra_context.items()) {
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minja::Value val(kv.value());
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context->set(kv.key(), val);
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}
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}
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auto ret = template_root_->render(context);
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// fprintf(stderr, "actual_messages: %s\n", actual_messages.dump(2).c_str());
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// fprintf(stderr, "apply: %s\n\n", ret.c_str());
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return ret;
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}
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static nlohmann::ordered_json add_system(const nlohmann::ordered_json & messages, const std::string & system_prompt) {
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json messages_with_system = messages;
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if (messages_with_system.size() > 0 && messages_with_system[0].at("role") == "system") {
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std::string existing_system = messages_with_system.at(0).at("content");
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messages_with_system[0] = json {
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{"role", "system"},
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{"content", existing_system + "\n" + system_prompt},
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};
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} else {
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messages_with_system.insert(messages_with_system.begin(), json {
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{"role", "system"},
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{"content", system_prompt},
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});
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}
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return messages_with_system;
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}
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};
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} // namespace minja
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