fetch_mldata: how to manually set up MNIST dataset when source server is down?

Question

I need to run a code that contains these lines:

from sklearn.datasets import fetch_mldata
mnist = fetch_mldata(\'MNIST original\')

There se

Answer 1

fetch_mldata will by default check the data in `'~/scikit_learn_data/mldata' to see if the dataset is already downloaded or not.

According to source code

    # if the file does not exist, download it
    if not exists(filename):
        urlname = MLDATA_BASE_URL % quote(dataname)

So in your case, it will check the location

~/scikit_learn_data/mldata/mnist-original.mat

and if not found, it will download from

http://mldata.org/repository/data/download/matlab/mnist-original.mat

which currently is down as you suspected.

So what you can do is download the dataset from any other location like this:

https://github.com/amplab/datascience-sp14/blob/master/lab7/mldata/mnist-original.mat

and keep that in the above folder.

After that when you run fetch_mldata() it should pick the downloaded dataset without connecting mldata.org.

Update:

Here ~ refers to the user home folder. You can use the following code to know the default location of that folder according to your system.

from sklearn.datasets import get_data_home
print(get_data_home())