updated gpu/cpu device code

app.py

@@ -98,6 +98,7 @@ classes = ['burger',  'butter_naan',  'chai',  'chapati',  'chole_bhature',
            'kaathi_rolls',  'kadai_paneer',  'kulfi',  'masala_dosa',  'momos',
            'paani_puri',  'pakode',  'pav_bhaji',  'pizza',  'samosa']
 model = IndianFoodModelResnet50(len(classes), pretrained=True)
+device = get_default_device()
 to_device(model, device);