title: Image preprocessing of finetune in ResNet
body: <p>I want to finetune ResNet50 ImageNet pretrained model, and I have a few question about image preprocessing of finetune.   </p>
  
  <ol>
  <li><p>In ImageNet preprocessing, we need to subtract the mean of pixel ([103.939, 116.779, 123.68]). When I use my dataset to finetune, should I subtract mean of ImageNet or subtract the mean of my data.</p></li>
  <li><p>I do see many people rescale the data to [0,1], but the pretrained model(ImageNet) use image scale in [0,255]. Why do people do that? Is it reasonable?  </p></li>
  </ol>