Update app.py

app.py

@@ -12,6 +12,7 @@ import torchvision.transforms as transforms
 import copy
 import torchvision.models as models
 import torchvision.transforms.functional as TF
+Import PIL
 from PIL import Image
 import numpy as np
 from model import ContentLoss, gram_matrix, StyleLoss, image_transform, get_input_optimizer,get_style_model_and_losses