Wire LLM_KV_TOKENIZER_CHAT_TEMPLATE_N in llama_model_chat_template

Author: ochafik

common/common.cpp

@@ -1822,17 +1822,6 @@ std::string common_chat_format_example(const struct llama_model * model,
     return common_chat_apply_template(model, tmpl, msgs, true);
 }
 
-static std::string _llama_model_meta_val_str(const struct llama_model * model, const char * key) {
-    int32_t tlen = llama_model_meta_val_str(model, key, nullptr, 0);
-    if (tlen > 0) {
-        std::vector<char> curr_tmpl_buf(tlen + 1, 0);
-        if (llama_model_meta_val_str(model, key, curr_tmpl_buf.data(), curr_tmpl_buf.size()) == tlen) {
-            return std::string(curr_tmpl_buf.data(), tlen);
-        }
-    }
-    return "";
-}
-
 llama_chat_templates llama_chat_templates_from_model(const struct llama_model * model, const std::string & chat_template_override)
 {
     auto vocab = llama_model_get_vocab(model);
@@ -1841,9 +1830,8 @@ llama_chat_templates llama_chat_templates_from_model(const struct llama_model *
     std::string default_template_src = chat_template_override;
     std::string tool_use_template_src = chat_template_override;
     if (chat_template_override.empty()) {
-        // TODO: 
-        default_template_src = _llama_model_meta_val_str(model, "tokenizer.chat_template");
-        tool_use_template_src = _llama_model_meta_val_str(model, "tokenizer.chat_template.tool_use");
+        default_template_src = llama_model_chat_template(model, /* name */ nullptr);
+        tool_use_template_src = llama_model_chat_template(model, /* name */ "tool_use");
     }
     if (default_template_src.empty() || default_template_src == "chatml") {
         if (!tool_use_template_src.empty()) {

examples/run/run.cpp

@@ -713,11 +713,11 @@ static void add_message(const char * role, const std::string & text, LlamaData &
 // Function to apply the chat template and resize `formatted` if needed
 static int apply_chat_template(LlamaData & llama_data, const bool append) {
     int result = llama_chat_apply_template(
-        llama_model_chat_template(llama_data.model.get()), llama_data.messages.data(), llama_data.messages.size(), append,
+        llama_model_chat_template(llama_data.model.get(), /* name */ nullptr), llama_data.messages.data(), llama_data.messages.size(), append,
         append ? llama_data.fmtted.data() : nullptr, append ? llama_data.fmtted.size() : 0);
     if (append && result > static_cast<int>(llama_data.fmtted.size())) {
         llama_data.fmtted.resize(result);
-        result = llama_chat_apply_template(llama_model_chat_template(llama_data.model.get()), llama_data.messages.data(),
+        result = llama_chat_apply_template(llama_model_chat_template(llama_data.model.get(), /* name */ nullptr), llama_data.messages.data(),
                                            llama_data.messages.size(), append, llama_data.fmtted.data(),
                                            llama_data.fmtted.size());
     }

examples/simple-chat/simple-chat.cpp

@@ -161,7 +161,7 @@ int main(int argc, char ** argv) {
             break;
         }
 
-        const char * tmpl = llama_model_chat_template(model);
+        const char * tmpl = llama_model_chat_template(model, /* name */ nullptr);
 
         // add the user input to the message list and format it
         messages.push_back({"user", strdup(user.c_str())});

include/llama.h

@@ -503,7 +503,7 @@ extern "C" {
     LLAMA_API uint64_t llama_model_size(const struct llama_model * model);
 
     // Get the default chat template. Returns nullptr if not available
-    LLAMA_API const char * llama_model_chat_template(const struct llama_model * model);
+    LLAMA_API const char * llama_model_chat_template(const struct llama_model * model, const char * name);
 
     // Returns the total number of parameters in the model
     LLAMA_API uint64_t llama_model_n_params(const struct llama_model * model);

src/llama-arch.cpp

@@ -179,6 +179,7 @@ static const std::map<llm_kv, const char *> LLM_KV_NAMES = {
     { LLM_KV_TOKENIZER_HF_JSON,              "tokenizer.huggingface.json"              },
     { LLM_KV_TOKENIZER_RWKV,                 "tokenizer.rwkv.world"                    },
     { LLM_KV_TOKENIZER_CHAT_TEMPLATE,        "tokenizer.chat_template"                 },
+    { LLM_KV_TOKENIZER_CHAT_TEMPLATE_N,      "tokenizer.chat_template.%s"              },
     { LLM_KV_TOKENIZER_FIM_PRE_ID,           "tokenizer.ggml.fim_pre_token_id"         },
     { LLM_KV_TOKENIZER_FIM_SUF_ID,           "tokenizer.ggml.fim_suf_token_id"         },
     { LLM_KV_TOKENIZER_FIM_MID_ID,           "tokenizer.ggml.fim_mid_token_id"         },
@@ -1443,10 +1444,11 @@ static const std::map<llm_tensor, llm_tensor_info> LLM_TENSOR_INFOS = {
     {LLM_TENSOR_CONVNEXT_GAMMA,             {LLM_TENSOR_LAYER_REPEATING, GGML_OP_MUL}},
 };
 
-LLM_KV::LLM_KV(llm_arch arch) : arch(arch) {}
+LLM_KV::LLM_KV(llm_arch arch, const char * suffix) : arch(arch), suffix(suffix) {}
 
 std::string LLM_KV::operator()(llm_kv kv) const {
-    return ::format(LLM_KV_NAMES.at(kv), LLM_ARCH_NAMES.at(arch));
+    return suffix ? ::format(LLM_KV_NAMES.at(kv), LLM_ARCH_NAMES.at(arch), suffix)
+        : ::format(LLM_KV_NAMES.at(kv), LLM_ARCH_NAMES.at(arch));
 }
 
 std::string LLM_TN_IMPL::str() const {

src/llama-arch.h

@@ -177,6 +177,7 @@ enum llm_kv {
     LLM_KV_TOKENIZER_HF_JSON,
     LLM_KV_TOKENIZER_RWKV,
     LLM_KV_TOKENIZER_CHAT_TEMPLATE,
+    LLM_KV_TOKENIZER_CHAT_TEMPLATE_N,
     LLM_KV_TOKENIZER_FIM_PRE_ID,
     LLM_KV_TOKENIZER_FIM_SUF_ID,
     LLM_KV_TOKENIZER_FIM_MID_ID,
@@ -335,9 +336,10 @@ enum llm_tensor_layer {
 };
 
 struct LLM_KV {
-    LLM_KV(llm_arch arch);
+    LLM_KV(llm_arch arch, const char * suffix = nullptr);
 
     llm_arch arch;
+    const char * suffix;
 
     std::string operator()(llm_kv kv) const;
 };

src/llama-model.cpp

@@ -3912,8 +3912,10 @@ uint64_t llama_model_size(const struct llama_model * model) {
     return model->size();
 }
 
-const char * llama_model_chat_template(const struct llama_model * model) {
-    const auto & it = model->gguf_kv.find(LLM_KV(model->arch)(LLM_KV_TOKENIZER_CHAT_TEMPLATE));
+const char * llama_model_chat_template(const struct llama_model * model, const char * name) {
+    const auto key = name ? LLM_KV(model->arch, name)(LLM_KV_TOKENIZER_CHAT_TEMPLATE_N)
+        : LLM_KV(model->arch)(LLM_KV_TOKENIZER_CHAT_TEMPLATE);
+    const auto & it = model->gguf_kv.find(key);
     if (it == model->gguf_kv.end()) {
         return nullptr;
     }