fix dropdown

app.py

@@ -139,7 +139,7 @@ if __name__ == "__main__":
             gr.Dropdown(
                 choices=[512, 1024, 2048, 4096],
                 label="token_batch_length",
-                default=2048,
+                value=2048,
             ),
             gr.inputs.Slider(
                 minimum=0.5, maximum=1.1, label="length_penalty", default=0.7, step=0.05