Update app.py

app.py

@@ -34,7 +34,7 @@ class ChatBot:
         user_input_ids = tokenizer.encode(input + tokenizer.eos_token, return_tensors="pt")
 
         # Concatenate the user input with chat history
-        if self.history.numel() > 0:
+        if len(self.history) > 0:
             chat_history_ids = torch.cat([self.history, user_input_ids], dim=-1)
         else:
             chat_history_ids = user_input_ids