correct usage of the dropdown

app.py

@@ -1,7 +1,6 @@
 import gradio as gr
 from rembg import remove, new_session
 from PIL import Image
-import numpy as np
 import logging
 
 # Set up logging
@@ -47,10 +46,10 @@ iface = gr.Interface(
     inputs=[
         gr.Image(type="pil"),
         gr.ColorPicker(label="Background Color", value=None), # Background color picker
-        gr.Dropdown(choices=["u2net", "isnet-general-use", "unet"], label="Model Selection", default="u2net"),
-        gr.Checkbox(label="Enable Alpha Matting", default=False),
-        gr.Checkbox(label="Post-Process Mask", default=False),
-        gr.Checkbox(label="Only Return Mask", default=False)
+        gr.Dropdown(choices=["u2net", "isnet-general-use", "unet"], label="Model Selection", value="u2net"),
+        gr.Checkbox(label="Enable Alpha Matting", value=False),
+        gr.Checkbox(label="Post-Process Mask", value=False),
+        gr.Checkbox(label="Only Return Mask", value=False)
     ],
     outputs=[
         gr.Image(type="pil", label="Output Image"),