Update app.py

Default image height and width

app.py

@@ -92,7 +92,11 @@ def run_style_transfer(cnn, normalization_mean, normalization_std,
     output_img = Image.fromarray((output_np * 255).astype(np.uint8))
     
     return output_img
-                           
+
+# Define the dimensions of the random output image
+image_width = 128
+image_height = 128
+
 #example_images
 example_list = [["examples/" + example] for example in os.listdir("examples")]