Fix app.py

app.py

@@ -3,15 +3,18 @@ __all__ = ['getx','gety','learn','categories','classify_images','image','label',
 import gradio as gr
 from fastai.vision.all import *
 
-import pathlib
-plt = platform.system()
-if plt == 'Windows': pathlib.PosixPath = pathlib.WindowsPath
-
 def getx(r):return r['fname']
 def gety(r):return r['cat'].split(' ')
 
+import pathlib
+posix_backup = pathlib.PosixPath
 model_path = Path('./model.pkl')
-learn = load_learner(model_path)
+try:
+    pathlib.PosixPath = pathlib.WindowsPath
+    learn = load_learner(model_path)
+finally:
+    pathlib.PosixPath = posix_backup
+
 
 categories = ('Grizzly','Black','Toy','White','Brown')