Update app.py

app.py

@@ -1,12 +1,12 @@
 import gradio as gr
 from fastai.vision.all import *
-from os.path import file_exists
+from os.path import exists
 import requests
 
 model_fn = 'quick_224px'
 url = 'https://huggingface.co/johnowhitaker/sketchy_unet_rn34/resolve/main/quick_224px'
 
-if not file_exists(model_fn):
+if not exists(model_fn):
   print('starting download')
   with requests.get(url, stream=True) as r:
     r.raise_for_status()