Here is an example from fish.ipynb notebook (inside dl1 directory). In the case of the this Kaggle competition the important part of the image is a fish. The fish were often not in the middle of the image so the cropped image missed the most important information.
sz = 350
tfms = tfms_from_model(resnet34, sz, crop_type=CropType.NO)
data = ImageClassifierData.from_csv(PATH, "images", csv_fname, bs, tfms, val_idxs)