add built in chat template

Author: CISC

src/llama-chat.cpp

@@ -70,6 +70,7 @@ static const std::map<std::string, llm_chat_template> LLM_CHAT_TEMPLATES = {
     { "hunyuan-dense",     LLM_CHAT_TEMPLATE_HUNYUAN_DENSE     },
     { "kimi-k2",           LLM_CHAT_TEMPLATE_KIMI_K2           },
     { "seed_oss",          LLM_CHAT_TEMPLATE_SEED_OSS          },
+    { "grok-2",            LLM_CHAT_TEMPLATE_GROK_2            },
 };
 
 llm_chat_template llm_chat_template_from_str(const std::string & name) {
@@ -204,6 +205,8 @@ llm_chat_template llm_chat_detect_template(const std::string & tmpl) {
         return LLM_CHAT_TEMPLATE_KIMI_K2;
     } else if (tmpl_contains("<seed:bos>")) {
         return LLM_CHAT_TEMPLATE_SEED_OSS;
+    } else if (tmpl_contains("'Assistant: '  + message['content'] + '<|separator|>")) {
+        return LLM_CHAT_TEMPLATE_GROK_2;
     }
     return LLM_CHAT_TEMPLATE_UNKNOWN;
 }
@@ -763,6 +766,20 @@ int32_t llm_chat_apply_template(
         if (add_ass) {
             ss << "<seed:bos>assistant\n";
         }
+    } else if (tmpl == LLM_CHAT_TEMPLATE_GROK_2) {
+        for (auto message : chat) {
+            std::string role(message->role);
+            if (role == "system") {
+                ss << "System: " << trim(message->content) << "<|separator|>\n\n";
+            } else if (role == "user") {
+                ss << "Human: " << trim(message->content) << "<|separator|>\n\n";
+            } else if (role == "assistant") {
+                ss << "Assistant: " << message->content << "<|separator|>\n\n";
+            }
+        }
+        if (add_ass) {
+            ss << "Assistant:";
+        }
     } else {
         // template not supported
         return -1;

src/llama-chat.h

@@ -50,6 +50,7 @@ enum llm_chat_template {
     LLM_CHAT_TEMPLATE_HUNYUAN_DENSE,
     LLM_CHAT_TEMPLATE_KIMI_K2,
     LLM_CHAT_TEMPLATE_SEED_OSS,
+    LLM_CHAT_TEMPLATE_GROK_2,
     LLM_CHAT_TEMPLATE_UNKNOWN,
 };