下载mnist未知URL类型的错误信息：HTTPS

Question

当我尝试使用代码加载mnist数据集时

import tensorflow as tf
import numpy as np
from keras.models import Sequential
from keras.layers import Dense, Dropout, Activation, Flatten
from keras.layers import Convolution2D, MaxPooling2D
from keras.utils import np_utils

(X_train, y_train), (X_test, y_test) = tf.keras.datasets.mnist.load_data()

它给我一条错误消息，说：

Exception: URL fetch failure on https://storage.googleapis.com/tensorflow/tf-keras-datasets/mnist.npz: None -- unknown url type: https

我知道问题出在(X_train, y_train), (X_test, y_test) = tf.keras.datasets.mnist.load_data()行上，但是我找不到在线解决方法。我正在使用Windows 10，并且我使用Jupyter笔记本和Anaconda。