Update app.py

app.py

@@ -51,7 +51,7 @@ def network_visualizer(city, year, num_nodes):
         attribute_value = row['Hadiths']
         edge_color = value_to_hex(attribute_value)
         hadith_count = teacher_hadiths[teacher_hadiths['Teacher'] == source]['Hadiths'].to_list()[0]
-        if source not in node_roles or node_roles[source] == "source":
+        if source not in node_roles or node_roles[source] == "target":
             node_roles[source] = "source"
             node_colors[source] = value_to_hex(hadith_count)
             net.add_node(source, color=value_to_hex(hadith_count), font={'size': 30, 'color': 'orange'})