Fix: model dependency + default sample

app.py

@@ -37,11 +37,12 @@ with gr.Blocks() as interface:
     gr.Markdown("Upload an image or select a sample image to visualize object detection.")
 
     with gr.Row():
-        uploaded_image = gr.Image(type="pil", label="Upload an Image", value = None)
+        uploaded_image = gr.Image(type="pil", label="Upload an Image")
         sample_selection = gr.Dropdown(
             choices=list(sample_images.keys()),
             label="Select a Sample Image",
-            type="Sample 1",
+            value="Sample 1",  # Default selection
+            type="value",  # Correct type parameter
         )
         sample_display = gr.Image(label="Sample Image Preview", value=default_sample_image)
         sample_selection.change(
@@ -57,17 +58,11 @@ with gr.Blocks() as interface:
     )
 
     result_gallery = gr.Gallery(label="Results", elem_id="gallery", rows=2, height=500)
-    if uploaded_image is not None:
-        gr.Button("Run").click(
-            fn=process_image,
-            inputs=[uploaded_image, selected_models],        
-            outputs=result_gallery,
-        )
-    else:
-        gr.Button("Run").click(
-            fn=process_image,
-            inputs=[sample_display, selected_models],        
-            outputs=result_gallery,
-        )
+
+    gr.Button("Run").click(
+        fn=process_image,
+        inputs=[uploaded_image, selected_models, sample_selection],
+        outputs=result_gallery,
+    )
 
 interface.launch()