update app.py

app.py

@@ -85,7 +85,9 @@ class ImageColorizationPipeline(object):
 
         return output_img
 
-
+colorizer = ImageColorizationPipeline(model_path=model_path,
+                                      input_size=input_size,
+                                      model_size=model_size)
 
 def colorize_image(image):
     """Colorizes a grayscale image using the DDColor model."""