try set default value for radio

app.py

@@ -168,7 +168,9 @@ myTheme = myTheme()
 
 with gr.Blocks(theme=myTheme) as demo:
     article = gr.Textbox(label="Article")
-    toolkit_select = gr.Radio(["OPUS", "NLLB"], label="Select Translation Model")
+    toolkit_select = gr.Radio(
+        ["OPUS", "NLLB"], label="Select Translation Model", value="OPUS"
+    )
     lang_select = gr.Radio(["English", "Chinese"], label="Select Desired Language")
     result = gr.Textbox(label="Translated Result")
     trans_btn = gr.Button("Translate")