ChatON:Add Monarch model template, which uses Begin + Prefix

Inturn Begin/BoS is added only for non 1st user messages in a
system+user prompts chain.

Author: hanishkvc

common/chaton.hpp

@@ -50,7 +50,7 @@
  * These always adds any role specific prefix and suffix around the passed message.
  *
  * Sample chaton_meta.json includes template info for
- * * llama2, llama3, gemma, chatml, zephyr, deepseek
+ * * llama2, llama3, gemma, chatml, zephyr, deepseek, monarch
  *
  */
 
@@ -197,6 +197,7 @@ inline void _chaton_meta_dump(std::string &tmpl) {
         LOGXLN("INFO:%s:%s:%s", __func__, "assistant->prefix", chaton_tmpl_role_kv(tmpl, K_ASSISTANT, K_PREFIX).c_str());
         LOGXLN("INFO:%s:%s:%s", __func__, "assistant->suffix", chaton_tmpl_role_kv(tmpl, K_ASSISTANT, K_SUFFIX).c_str());
         LOGXLN("INFO:%s:%s:%s", __func__, K_REVERSE_PROMPT, chaton_tmpl_kv(tmpl, K_REVERSE_PROMPT).c_str());
+        LOGXLN("INFO:%s:%s:%d", __func__, K_SYSTEMUSER_1ST_USER_HAS_BEGIN, chaton_tmpl_kv_bool(tmpl, K_SYSTEMUSER_1ST_USER_HAS_BEGIN));
         LOGXLN("INFO:%s:%s:%d", __func__, K_SYSTEMUSER_1ST_USER_HAS_PREFIX, chaton_tmpl_kv_bool(tmpl, K_SYSTEMUSER_1ST_USER_HAS_PREFIX));
     }
 }

examples/chaton_meta.json

@@ -153,6 +153,28 @@
 		"reverse-prompt": "<｜end▁of▁sentence｜>",
 		"systemuser-1st-user-has-begin": true,
 		"systemuser-1st-user-has-prefix": true
+	},
+	"monarch": {
+		"global": {
+			"begin": "",
+			"end": ""
+		},
+		"system": {
+			"prefix": "<s>system\n",
+			"suffix": "</s>\n"
+		},
+		"user": {
+			"begin": "<s>",
+			"prefix": "user\n",
+			"suffix": "</s>\n"
+		},
+		"assistant": {
+			"prefix": "<s>assistant\n",
+			"suffix": " </s>\n"
+		},
+		"reverse-prompt": "</s>",
+		"systemuser-1st-user-has-begin": false,
+		"systemuser-1st-user-has-prefix": true
 	}
 }