enable session based memory

app.py

@@ -47,12 +47,14 @@ def add_text(history, text):
 
 
 def bot(history):
-    print(history)
+    # session based memory
+    if len(history) == 1:
+        chain.memory.clear()
+
     history[-1][1] = ""
     user_message = history[-1][0]
 
     for chunk in chain.stream({"text": user_message}):
-        print(chunk)
         history[-1][1] += chunk["text"]
         yield history