以下のサイトで提供されているカラー画像8000万枚のデータセットCIFAR-10を読み込みたいのですがいくつか他のサイトにあるものを試しているのですがどれもうまくいかず、ご存知の方いらしましたら教えて頂きたいです。

データ元
https://www.cs.toronto.edu/~kriz/cifar.html

以下読み込むコード

import pickle
import numpy as np
import os

def unpickle(file):
    fo = open(file, 'rb')
    dict = pickle.load(fo)
    fo.close()
    return dict

def conv_data2image(data):
    return np.rollaxis(data.reshape((3,32,32)),0,3)

def get_cifar10(folder):
    tr_data = np.empty((0,32*32*3))
    tr_labels = np.empty(1)
    '''
    32x32x3
    '''
    for i in range(1,6):
        fname = os.path.join(folder, "%s%d" % ("data_batch_", i))
        data_dict = unpickle(fname)
        if i == 1:
            tr_data = data_dict['data']
            tr_labels = data_dict['labels']
        else:
            tr_data = np.vstack((tr_data, data_dict['data']))
            tr_labels = np.hstack((tr_labels, data_dict['labels']))

    data_dict = unpickle(os.path.join(folder, 'test_batch'))
    te_data = data_dict['data']
    te_labels = np.array(data_dict['labels'])

    bm = unpickle(os.path.join(folder, 'batches.meta'))
    label_names = bm['label_names']
    return tr_data, tr_labels, te_data, te_labels, label_names

if __name__ == '__main__':
    datapath = "./data/cifar-10-batches-py"

    tr_data10, tr_labels10, te_data10, te_labels10, label_names10 = get_cifar10(datapath)

以下エラー

"C:\…\AppData\Local\Programs\Python\Python35\python.exe"
"C:/…/PycharmProjects/Convolutional Neural Networks for Visual
Recognition/input_cifar.py" Traceback (most recent call last): File
"C:/…/PycharmProjects/Convolutional Neural Networks for Visual
Recognition/input_cifar.py", line 41, in tr_data10,
tr_labels10, te_data10, te_labels10, label_names10 =
get_cifar10(datapath) File "C:/…/PycharmProjects/Convolutional Neural
Networks for Visual Recognition/input_cifar.py", line 22, in
get_cifar10 data_dict = unpickle(fname) File
"C:/…/PycharmProjects/Convolutional Neural Networks for Visual
Recognition/input_cifar.py", line 7, in unpickle dict =
pickle.load(fo) UnicodeDecodeError: 'ascii' codec can't decode byte
0x8b in position 6: ordinal not in range(128)

Process finished with exit code 1