Update app.py

app.py

@@ -126,8 +126,8 @@ async def train_and_save_model():
             await asyncio.sleep(60)
             continue
 
-        train_x = np.array([row[0] for row in training])
-        train_y = np.array([row[1] for row in training])
+        train_x = np.array([row[0] for row in training], dtype=np.float32)
+        train_y = np.array([row[1] for row in training], dtype=np.float32)
 
         print("Loading or creating model...")
         if os.path.exists('chatbot_model.h5'):