fix session state and translation input

app.py

@@ -210,8 +210,9 @@ def mpc_translation(text, src_language, target_language, iterations, session_id)
 # ---------- Gradio function ----------
 
 def process_text(text, src_language, target_language, max_iterations_value, threshold_value,
-                 good_ref_contexts_num_value, translation_methods, state):
+                 good_ref_contexts_num_value, translation_methods=None, state=None):
     
+    translation_methods = translation_methods or ["Original", "Plan2Align"]
     state = state or {}
     session_id = get_user_session(state)
 
@@ -336,8 +337,7 @@ with gr.Blocks(title="Test-Time Machine Translation with Plan2Align") as demo:
             task_language_input,
             max_iterations_input,
             threshold_input,
-            good_ref_contexts_num_input,
-            state
+            good_ref_contexts_num_input
         ],
         outputs=[original_output, plan2align_output, best_of_n_output, mpc_output],
         fn=process_text