disable diverse beam search by default (ie. apply standard beam search)

app.py

@@ -188,11 +188,11 @@ with gr.Blocks(css=custom_css) as demo:
             minimum=1, maximum=30, step=1, value=10, label="M（建議數/Beam 數）"
         )
         group_slider = gr.Slider(
-            minimum=1, maximum=30, step=1, value=6,
+            minimum=2, maximum=30, step=2, value=6,
             label="Beam 群組數 (num_beam_groups)"
         )
         diversity_penalty_slider = gr.Slider(
-            minimum=0.0, maximum=2.0, step=0.1, value=1.0,
+            minimum=0.0, maximum=2.0, step=0.1, value=0.0,
             label="多樣性懲罰 (diversity_penalty)"
         )