%reload_ext autoreload
%autoreload 2

from fastai.vision import *
from fastai.vision.models.wrn import wrn_22

torch.backends.cudnn.benchmark = True

path = untar_data(URLs.CIFAR)
path

ds_tfms = ([*rand_pad(4, 32), flip_lr(p=0.5)], [])
data = ImageDataBunch.from_folder(path, valid='test', ds_tfms=ds_tfms, bs=512).normalize(cifar_stats)

learn = Learner(data, wrn_22(), metrics=accuracy).to_fp16()
learn.fit_one_cycle(30, 3e-3, wd=0.4, div_factor=10, pct_start=0.5)