Update src/streamlit_app.py

src/streamlit_app.py

@@ -686,8 +686,15 @@ with tabs[4]:
             #  Prevent premature __len__() access on unfitted ensemble models
             for r in tuned_results:
                 m = r.get("model_obj")
-                if m and hasattr(m, "__len__") and not hasattr(m, "estimators_"):
-                    m.__len__ = lambda self=m: 0
+                # Avoid implicit truth check that calls __len__
+                if m is not None:
+                    try:
+                        # If model defines __len__, override before fit
+                        if "__len__" in dir(m) and not hasattr(m, "estimators_"):
+                            setattr(m, "__len__", lambda self=m: 0)
+                    except Exception:
+                        pass
+
 
 
             for fam, entry in [(r["family"], r) for r in tuned_results if r.get("model_obj")]: