Update visualization.py

visualization.py

@@ -106,11 +106,6 @@ class Visualization:
     
         return dot
     
-    def download_tree_diagram(self, dot, filename):
-        # Render the diagram to a file
-        filepath = dot.render(filename, format='png', cleanup=True)
-        return filepath
-        
     def download_chart(self, fig, filename):
         buffer = io.BytesIO()
         fig.savefig(buffer, format='png')