I have download the mnist but has the error,like this:
Traceback (most recent call last):
File “404_autoencoder.py”, line 36, in 
download=DOWNLOAD_MNIST,                        # download it if you don’t have it
File “/home/jackie/miniconda3/lib/python3.6/site-packages/torchvision/datasets/mnist.py”, line 36, in init
’ You can use download=True to download it’)
RuntimeError: Dataset not found. You can use download=True to download it