in tensorflow_managed_spot_training_checkpointing/generate_cifar10_tfrecords.py [0:0]
def download_and_extract(data_dir):
# download CIFAR-10 if not already downloaded.
tf.contrib.learn.datasets.base.maybe_download(CIFAR_FILENAME, data_dir, CIFAR_DOWNLOAD_URL)
tarfile.open(os.path.join(data_dir, CIFAR_FILENAME), 'r:gz').extractall(data_dir)