support qwen tool format

Former-commit-id: cbef4cb501fa1b50fa611e7054a856ce2c5ed10e

src/llamafactory/data/tool_utils.py

@@ -51,6 +51,14 @@ LLAMA3_TOOL_PROMPT = (
     "Do not use variables.\n\n{tool_text}"
 )
 
+QWEN_TOOL_PROMPT = (
+    "\n\n# Tools\n\nYou may call one or more functions to assist with the user query.\n\n"
+    "You are provided with function signatures within <tools></tools> XML tags:\n<tools>{tool_text}"
+    "\n</tools>\n\nFor each function call, return a json object with function name and arguments within "
+    """<tool_call></tool_call> XML tags:\n<tool_call>\n{{"name": <function-name>, """
+    """"arguments": <args-json-object>}}\n</tool_call><|im_end|>\n"""
+)
+
 
 @dataclass
 class ToolUtils(ABC):
@@ -79,11 +87,17 @@ class ToolUtils(ABC):
     def tool_extractor(content: str) -> Union[str, List["FunctionCall"]]:
         r"""
         Extracts all the function calls from the assistant message.
+
+        It should be an inverse function of `function_formatter`.
         """
         ...
 
 
 class DefaultToolUtils(ToolUtils):
+    r"""
+    Default tool using template.
+    """
+
     @override
     @staticmethod
     def tool_formatter(tools: List[Dict[str, Any]]) -> str:
@@ -149,6 +163,10 @@ class DefaultToolUtils(ToolUtils):
 
 
 class GLM4ToolUtils(ToolUtils):
+    r"""
+    GLM-4 tool using template.
+    """
+
     @override
     @staticmethod
     def tool_formatter(tools: List[Dict[str, Any]]) -> str:
@@ -205,7 +223,7 @@ class Llama3ToolUtils(ToolUtils):
     @staticmethod
     def function_formatter(functions: List["FunctionCall"]) -> SLOTS:
         if len(functions) > 1:
-            raise ValueError("Llama 3 does not support parallel functions.")
+            raise ValueError("Llama-3 does not support parallel functions.")
 
         return [f'{{"name": "{functions[0].name}", "parameters": {functions[0].arguments}}}']
 
@@ -224,6 +242,10 @@ class Llama3ToolUtils(ToolUtils):
 
 
 class MistralToolUtils(ToolUtils):
+    r"""
+    Mistral v0.3 tool using template.
+    """
+
     @override
     @staticmethod
     def tool_formatter(tools: List[Dict[str, Any]]) -> str:
@@ -263,11 +285,61 @@ class MistralToolUtils(ToolUtils):
         return results
 
 
+class QwenToolUtils(ToolUtils):
+    r"""
+    Qwen 2.5 tool using template.
+    """
+
+    @override
+    @staticmethod
+    def tool_formatter(tools: List[Dict[str, Any]]) -> str:
+        tool_text = ""
+        for tool in tools:
+            wrapped_tool = {"type": "function", "function": tool}
+            tool_text += "\n" + json.dumps(wrapped_tool, ensure_ascii=False)
+
+        return QWEN_TOOL_PROMPT.format(tool_text=tool_text)
+
+    @override
+    @staticmethod
+    def function_formatter(functions: List["FunctionCall"]) -> SLOTS:
+        function_texts = []
+        for name, arguments in functions:
+            function_texts.append(
+                "<tool_call>\n" + f'{{"name": "{name}", "arguments": {arguments}}}' + "\n</tool_call>"
+            )
+
+        return ["\n".join(function_texts)]
+
+    @override
+    @staticmethod
+    def tool_extractor(content: str) -> Union[str, List["FunctionCall"]]:
+        regex = re.compile(r"<tool_call>(.+?)</tool_call>(?=\s*<tool_call>|\s*$)", re.DOTALL)
+        tool_match: List[str] = re.findall(regex, content)
+        if not tool_match:
+            return content
+
+        results = []
+        for tool in tool_match:
+            try:
+                tool = json.loads(tool.strip())
+            except json.JSONDecodeError:
+                return content
+
+            if "name" not in tool or "arguments" not in tool:
+                return content
+
+            results.append(FunctionCall(tool["name"], json.dumps(tool["arguments"], ensure_ascii=False)))
+
+        return results
+
+
 TOOLS = {
     "default": DefaultToolUtils(),
     "glm4": GLM4ToolUtils(),
     "llama3": Llama3ToolUtils(),
     "mistral": MistralToolUtils(),
+    "qwen": QwenToolUtils(),
 }