bug fix

app.py

@@ -34,7 +34,6 @@ from router_backend import get_expert_routing
 #     BACKEND_AVAILABLE = False
 #     _backend_import_error = e
 
-HF_TOKEN: str = os.getenv("HF_TOKEN")
 
 EXPERTS = ["Language", "Logic", "Social", "World"]
 
@@ -99,8 +98,7 @@ def route_and_plot(
     - Call backend (real or mock)
     - Return a table + bar plot + status message
     """
-    if HF_TOKEN.strip() == "":
-        HF_TOKEN = None  # allow empty token
+    hf_token = os.getenv("HF_TOKEN")
 
     ablations = []
     if ablate_language:
@@ -133,7 +131,7 @@ def route_and_plot(
             generation = None
         else:
             try:
-                raw, generation = get_expert_routing(model_id, HF_TOKEN, prompt, ablations)  # <-- your real function
+                raw, generation = get_expert_routing(model_id, hf_token, prompt, ablations)  # <-- your real function
                 vals = _normalize_output(raw)
                 msg = "Routed with real backend."
             except Exception as e:
@@ -241,7 +239,8 @@ with gr.Blocks(theme=gr.themes.Soft(), fill_height=True) as demo:
     gr.Examples(
         examples=examples,
         inputs=[model_choice, user_prompt, assistant_prompt, ablate_language, ablate_logic, ablate_social, ablate_world],
-        label="Try these examples:"
+        label="Try these examples:",
+        cache_examples=True,
     )
 
 if __name__ == "__main__":