[model] support Youtu-LLM-2B (#9707)

src/llamafactory/data/template.py

@@ -2278,6 +2278,21 @@ register_template(
 )
 
 
+register_template(
+    name="youtu",
+    format_user=StringFormatter(slots=["<|User|>{{content}}<|Assistant|>"]),
+    format_assistant=StringFormatter(slots=["{{content}}<|end_of_text|>"]),
+    format_system=StringFormatter(slots=["{{content}}"]),
+    format_function=FunctionFormatter(slots=["{{content}}"], tool_format="default"),
+    format_observation=StringFormatter(slots=["<tool_response>\n{{content}}\n</tool_response><|Assistant|>"]),
+    format_tools=ToolFormatter(tool_format="default"),
+    format_prefix=EmptyFormatter(slots=[{"bos_token"}]),
+    stop_words=["<|end_of_text|>"],
+    replace_eos=True,
+    template_class=ReasoningTemplate,
+)
+
+
 register_template(
     name="yuan",
     format_user=StringFormatter(slots=["{{content}}", {"token": "<sep>"}]),

src/llamafactory/extras/constants.py

@@ -3846,6 +3846,21 @@ register_model_group(
 )
 
 
+register_model_group(
+    models={
+        "Youtu-LLM-2B-Instruct": {
+            DownloadSource.DEFAULT: "tencent/Youtu-LLM-2B",
+            DownloadSource.MODELSCOPE: "Tencent-YouTu-Research/Youtu-LLM-2B",
+        },
+        "Youtu-LLM-2B-Base": {
+            DownloadSource.DEFAULT: "tencent/Youtu-LLM-2B-Base",
+            DownloadSource.MODELSCOPE: "Tencent-YouTu-Research/Youtu-LLM-2B-Base",
+        },
+    },
+    template="youtu",
+)
+
+
 register_model_group(
     models={
         "Yuan2-2B-Chat": {