尝试导入MNIST时，出现以下错误:

from sklearn.datasets import fetch_mldata
import mnist

data_path = "../dataset"
mnist = fetch_mldata('MNIST original', data_home=data_path)

#mnist = MNIST('../dataset/MNIST')
x_train, y_train = mnist.load_training() #60000 samples
x_test, y_test = mnist.load_testing()    #10000 samples
X_train = np.asarray(x_train).astype(np.float32)
y_train = np.asarray(y_train).astype(np.int32)
X_test = np.asarray(x_test).astype(np.float32)
y_test = np.asarray(y_test).astype(np.int32)

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-8-5cbf011c3576> in <module>
      1 import mnist
      2 
----> 3 mnist = MNIST('../dataset/MNIST')
      4 x_train, y_train = mnist.load_training() #60000 samples
      5 x_test, y_test = mnist.load_testing()    #10000 samples

NameError: name 'MNIST' is not defined

ImportError                               Traceback (most recent call last)
<ipython-input-3-5e6e64b70463> in <module>
----> 1 from sklearn.datasets import fetch_mldata
      2 import mnist
      3 
      4 data_path = "../dataset"
      5 mnist = fetch_mldata('MNIST original', data_home=data_path)

ImportError: cannot import name 'fetch_mldata' from 'sklearn.datasets' (C:\Users\Ahmed\anaconda3\lib\site-packages\sklearn\datasets\__init__.py)

我用蟒蛇装了迷雾。 我尝试卸载它并重新安装，但我仍然收到相同的错误消息

谢谢