Update app.py

app.py

@@ -11,11 +11,11 @@ embeddings = HuggingFaceEmbeddings(model_name="all-MiniLM-L6-v2")
 vectorstore = FAISS.load_local("learncpp_faiss_index_full", embeddings, allow_dangerous_deserialization=True)
 retriever = vectorstore.as_retriever(search_kwargs={"k": 5})
 
-# 2. Set up the LLM
+# 2. Set up the LLM (Upgraded to Qwen Coder!)
 hf_token = os.environ.get("HF_TOKEN")
 llm = HuggingFaceEndpoint(
-    repo_id="HuggingFaceH4/zephyr-7b-beta",
-    # REMOVED the "task" parameter to prevent backend routing clashes
+    repo_id="Qwen/Qwen2.5-Coder-7B-Instruct",
+    task="text-generation",
     max_new_tokens=512,
     temperature=0.1,
     huggingfacehub_api_token=hf_token
@@ -46,14 +46,20 @@ rag_chain = (
     | StrOutputParser()
 )
 
-# 4. Define the Chat Interface WITH Memory
+# 4. Define the Chat Interface (Bulletproof Memory)
 def chat_function(message, history):
     try:
         formatted_input = ""
         if history:
             formatted_input += "Previous Conversation Context:\n"
-            for user_msg, bot_msg in history:
-                formatted_input += f"User: {user_msg}\nBot: {bot_msg}\n"
+            # Natively parses Gradio 6's new dictionary memory format
+            for msg in history:
+                if isinstance(msg, dict):
+                    role = "User" if msg.get("role") == "user" else "Bot"
+                    formatted_input += f"{role}: {msg.get('content', '')}\n"
+                else:
+                    # Fallback just in case it behaves weirdly
+                    formatted_input += f"User: {msg[0]}\nBot: {msg[1]}\n"
             formatted_input += "\n"
         
         formatted_input += f"Current Question: {message}"
@@ -68,8 +74,7 @@ demo = gr.ChatInterface(
     fn=chat_function,
     title="LearnCpp.com AI Assistant",
     description="Ask me any C++ question! I retrieve my answers directly from the complete LearnCpp tutorials.",
-    examples=["What is a pointer?", "Explain dynamic memory allocation.", "Give me an example of the previous concept."],
-    type="tuples" # ADDED THIS: Forces Gradio to use the format our memory loop expects!
+    examples=["What is a pointer?", "Explain dynamic memory allocation.", "Give me an example of the previous concept."]
 )
 
 if __name__ == "__main__":