Scikit-learn - Cannot load MNIST Original dataset using fetch_openml in Python

Question

I'm trying to load the MNIST Original dataset in Python. The sklearn.datasets.fetch_openml function doesn't seem to work for this.

Here is the code I'm using-

from sklearn.datasets import fetch_openml
dataset = fetch_openml("MNIST Original") 

I get this error-

File "generateClassifier.py", line 11, in <module>
  dataset = fetch_openml("MNIST Original")
  File "/home/inglorion/.local/lib/python3.5/site- 
packages/sklearn/datasets/openml.py", line 526, in fetch_openml
data_info = _get_data_info_by_name(name, version, data_home)
  File "/home/inglorion/.local/lib/python3.5/site- 
packages/sklearn/datasets/openml.py", line 302, in 
_get_data_info_by_name
    data_home)
  File "/home/inglorion/.local/lib/python3.5/site- 
packages/sklearn/datasets/openml.py", line 169, in 
_get_json_content_from_openml_api
    raise error
  File "/home/inglorion/.local/lib/python3.5/site- 
packages/sklearn/datasets/openml.py", line 164, in 
_get_json_content_from_openml_api
    return _load_json()
  File "/home/inglorion/.local/lib/python3.5/site- 
packages/sklearn/datasets/openml.py", line 52, in wrapper
    return f()
  File "/home/inglorion/.local/lib/python3.5/site- 
packages/sklearn/datasets/openml.py", line 160, in _load_json
    with closing(_open_openml_url(url, data_home)) as response:
  File "/home/inglorion/.local/lib/python3.5/site- 
packages/sklearn/datasets/openml.py", line 109, in _open_openml_url
with closing(urlopen(req)) as fsrc:
  File "/usr/lib/python3.5/urllib/request.py", line 163, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib/python3.5/urllib/request.py", line 472, in open
    response = meth(req, response)
  File "/usr/lib/python3.5/urllib/request.py", line 582, in 
http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python3.5/urllib/request.py", line 510, in error
    return self._call_chain(*args)
  File "/usr/lib/python3.5/urllib/request.py", line 444, in 
_call_chain
    result = func(*args)
  File "/usr/lib/python3.5/urllib/request.py", line 590, in 
http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
        urllib.error.HTTPError: HTTP Error 400: Bad Request

How can I fix this? Alternately, is there any other way to load the MNIST dataset into Python?

I'm using version 0.20.2 of scikit-learn.

I'm relatively new to programming in general, so I would appreciate it if I could get a simple answer. Thanks!

Solution 1

Try

mnist = fetch_openml('mnist_784')

I found it via https://www.openml.org/ under https://www.openml.org/d/554

Solution 2

you can use:

mist = fetch_openml('mnist_784', version=1)

Solution 3

Method fetch_openml() download dataset from mldata.org which is not stable and can not connect. An alternative way is manually to download the data set from the original data. You can download data from Kaggle(mnist data) and run the following code

from scipy.io import loadmat
mnist = loadmat("../input/mnist-original.loadmat")
mnist_data = mnist["data"].T
mnist_label = mnist["label"][0]

Solution 4

fetch_mldata is deprecated since scikit-learn v0.20

Test sklearn version

import sklearn
sklearn.__version__

Import Dataset

from sklearn.datasets import fetch_openml
X, y = fetch_openml('mnist_784', version=1, return_X_y=True)

Example

• https://scikit-learn.org/stable/auto_examples/neural_networks/plot_mnist_filters.html

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