Update mlc-chat-config.json

mlc-chat-config.json

@@ -44,13 +44,13 @@
   },
   "conv_template": {
     "name": "chatml",
-    "system_template": "<|im_start|>system\n{system_message}<|im_end|>\n",
-    "system_message": "A conversation between a user and an LLM-based AI assistant. The assistant gives helpful and honest answers.",
+    "system_template": "{system_message}",
+    "system_message": "",
     "system_prefix_token_ids": null,
     "add_role_after_system_message": true,
     "roles": {
-      "user": "<|im_start|>user",
-      "assistant": "<|im_start|>assistant"
+      "user": "<|prompt|>",
+      "assistant": "<|answer|>"
     },
     "role_templates": {
       "user": "{user_message}",
@@ -59,12 +59,12 @@
     },
     "messages": [],
     "seps": [
-      "<|im_end|>\n"
+      "</s>\n"
     ],
     "role_content_sep": "\n",
     "role_empty_sep": "\n",
     "stop_str": [
-      "<|im_end|>"
+      "</s>"
     ],
     "stop_token_ids": [
       2