fix: Fix -1 topic comparison

app.py

@@ -141,7 +141,7 @@ def generate_plot(
     cluster_keyword = {}
     with st.spinner("Now trying to express them with my own words... 💬"):
         for label in set(encoded_labels):
-            if label == '-1':
+            if label == -1:
                 cluster_keyword[label] = '-1'
                 continue
             cluster_keyword[label] = []