Add group chat and retrieve agent example

autogen/agentchat/contrib/retrieve_user_proxy_agent.py

@@ -122,6 +122,8 @@ def __init__(
                 - custom_token_count_function(Optional, Callable): a custom function to count the number of tokens in a string.
                     The function should take a string as input and return three integers (token_count, tokens_per_message, tokens_per_name).
                     Default is None, tiktoken will be used and may not be accurate for non-OpenAI models.
+                - n_results (Optional, int): the number of results to be retrieved. Useful in group chat. Will be overridden by the same
+                    parameter passed to `generate_init_message`. Default is 20.
             **kwargs (dict): other kwargs in [UserProxyAgent](../user_proxy_agent#__init__).
 
         Example of overriding retrieve_docs:
@@ -175,6 +177,8 @@ def retrieve_docs(self, problem: str, n_results: int = 20, search_string: str =
             self._retrieve_config.get("get_or_create", False) if self._docs_path is not None else False
         )
         self.custom_token_count_function = self._retrieve_config.get("custom_token_count_function", None)
+        self.n_results = self._retrieve_config.get("n_results", 20)
+        self._initchat_from_this = False  # assume this is not the agent to init chat
         self._context_max_tokens = self._max_tokens * 0.8
         self._collection = True if self._docs_path is None else False  # whether the collection is created
         self._ipython = get_ipython()
@@ -297,6 +301,14 @@ def _generate_retrieve_user_reply(
             messages = self._oai_messages[sender]
         message = messages[-1]
         update_context_case1, update_context_case2 = self._check_update_context(message)
+        if not self._initchat_from_this and not hasattr(self, "problem"):
+            # the first time the agent is called in a group chat
+            message = self.generate_init_message(message.get("content", ""), n_results=self.n_results)
+            self._initchat_from_this = False  # reset to False as the value is changed to True in generate_init_message
+            return True, message
+        elif not self._initchat_from_this and hasattr(self, "problem"):
+            # the agent is called in a group chat and the problem is already set
+            update_context_case1 = True
         if (update_context_case1 or update_context_case2) and self.update_context:
             print(colored("Updating context and resetting conversation.", "green"), flush=True)
             # extract the first sentence in the response as the intermediate answer
@@ -380,21 +392,22 @@ def retrieve_docs(self, problem: str, n_results: int = 20, search_string: str =
         self._results = results
         print("doc_ids: ", results["ids"])
 
-    def generate_init_message(self, problem: str, n_results: int = 20, search_string: str = ""):
+    def generate_init_message(self, problem: str, n_results: int = None, search_string: str = ""):
         """Generate an initial message with the given problem and prompt.
 
         Args:
             problem (str): the problem to be solved.
-            n_results (int): the number of results to be retrieved.
+            n_results (int): the number of results to be retrieved. Default is None, will use the value set in retrieve_config.
             search_string (str): only docs containing this string will be retrieved.
 
         Returns:
             str: the generated prompt ready to be sent to the assistant agent.
         """
         self._reset()
+        self._initchat_from_this = True
         self.retrieve_docs(problem, n_results, search_string)
         self.problem = problem
-        self.n_results = n_results
+        self.n_results = n_results if n_results is not None else self.n_results
         doc_contents = self._get_context(self._results)
         message = self._generate_message(doc_contents, self._task)
         return message