Improve OpenAIServerModel by making api_base and api_url optional (will then point to OpenAI server)

src/smolagents/local_python_executor.py

@@ -1099,7 +1099,7 @@ def import_modules(expression, state, authorized_imports):
         "popen",
         "spawn",
         "shutil",
-        "glob",
+        "sys",
         "pathlib",
         "io",
         "socket",

src/smolagents/models.py

@@ -561,10 +561,13 @@ class OpenAIServerModel(Model):
     Parameters:
         model_id (`str`):
             The model identifier to use on the server (e.g. "gpt-3.5-turbo").
-        api_base (`str`):
+        api_base (`str`, *optional*):
             The base URL of the OpenAI-compatible API server.
-        api_key (`str`):
+        api_key (`str`, *optional*):
             The API key to use for authentication.
+        custom_role_conversions (`Dict{str, str]`, *optional*):
+            Custom role conversion mapping to convert message roles in others.
+            Useful for specific models that do not support specific message roles like "system". 
         **kwargs:
             Additional keyword arguments to pass to the OpenAI API.
     """
@@ -572,8 +575,9 @@ class OpenAIServerModel(Model):
     def __init__(
         self,
         model_id: str,
-        api_base: str,
-        api_key: str,
+        api_base: Optional[str] = None,
+        api_key: Optional[str] = None,
+        custom_role_conversions: Optional[Dict[str, str]] = None,
         **kwargs,
     ):
         try:
@@ -589,6 +593,7 @@ class OpenAIServerModel(Model):
             api_key=api_key,
         )
         self.kwargs = kwargs
+        self.custom_role_conversions = custom_role_conversions
 
     def __call__(
         self,
@@ -598,7 +603,9 @@ class OpenAIServerModel(Model):
         tools_to_call_from: Optional[List[Tool]] = None,
     ) -> ChatMessage:
         messages = get_clean_message_list(
-            messages, role_conversions=tool_role_conversions
+            messages, role_conversions=(
+                self.custom_role_conversions if self.custom_role_conversions else tool_role_conversions
+            )
         )
         if tools_to_call_from:
             response = self.client.chat.completions.create(