Update app.py

app.py

@@ -30,6 +30,10 @@ def extract_main_topic(text: str) -> str:
     Returns:
         str: The extracted main topic as keywords.
     """
+
+    # Initialize BERTopic model
+    topic_model = BERTopic.load("MaartenGr/BERTopic_ArXiv")
+
     topics, probs = topic_model.transform([text])
 
     if topic_id == -1:  # BERTopic assigns -1 to noise (no topic detected)