Update app.py

app.py

@@ -1,3 +1,4 @@
+import gradio as gr
 import cv2
 import numpy as np
 
@@ -45,7 +46,7 @@ def infer(image_in):
 gr.Interface(
     fn = infer,
     inputs = gr.Image(
-        sources = "upload",
+        sources = ["upload"],
         type = "filepath"
     ),
     outputs = gr.Image()