Update app.py

app.py

@@ -75,6 +75,7 @@ def set_example_image(example: list):
 with gr.Blocks(css=css) as app:
     gr.Markdown(title)
     gr.Markdown(description)
+    img_path = None
 
     with gr.Tabs():
         with gr.TabItem("Image upload and detections visualization"):
@@ -145,3 +146,4 @@ with gr.Blocks(css=css) as app:
     )
 
     app.launch(enable_queue=True)
+