8000 DOC Instructions to troubleshoot Windows path length limit by ogrisel · Pull Request #15916 · scikit-learn/scikit-learn · GitHub
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Dec 18, 2019
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DOC Instructions to troubleshoot Windows path length limit #15916

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DOC Instructions to troubleshoot Windows path length limit
ogrisel Dec 18, 2019
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Fix restructuredtext formatting problems
ogrisel Dec 18, 2019
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37 changes: 36 additions & 1 deletion doc/install.rst
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Expand Up @@ -126,7 +126,7 @@ If you have not installed NumPy or SciPy yet, you can also install these using
conda or pip. When using pip, please ensure that *binary wheels* are used,
and NumPy and SciPy are not recompiled from source, which can happen when using
particular configurations of operating system and hardware (such as Linux on
a Raspberry Pi).
a Raspberry Pi).

If you must install scikit-learn and its dependencies with pip, you can install
it as ``scikit-learn[alldeps]``.
Expand Down Expand Up @@ -255,3 +255,38 @@ WinPython for Windows

The `WinPython <https://winpython.github.io/>`_ project distributes
scikit-learn as an additional plugin.


Troubleshooting
===============

.. _windows_longpath:

Error caused by file path length limit on Windows
-------------------------------------------------

It can happen that pip fails to install packages when reaching the default path
size limit of Windows if Python is installed in a nested location such as the
`AppData` folder structure under the user home directory, for instance::

C:\Users\username>C:\Users\username\AppData\Local\Microsoft\WindowsApps\python.exe -m pip install scikit-learn
Collecting scikit-learn
...
Installing collected packages: scikit-learn
ERROR: Could not install packages due to an EnvironmentError: [Errno 2] No such file or directory: 'C:\\Users\\username\\AppData\\Local\\Packages\\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\\LocalCache\\local-packages\\Python37\\site-packages\\sklearn\\datasets\\tests\\data\\openml\\292\\api-v1-json-data-list-data_name-australian-limit-2-data_version-1-status-deactivated.json.gz'

In this case it is possible to lift that limit in the Windows registry by
using the ``regedit`` tool:

#. Type "regedit" in the Windows start menu to launch ``regedit``.

#. Go to the
``Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem``
key.

#. Edit the value of the ``LongPathsEnabled`` property of that key and set
it to 1.

#. Reinstall scikit-learn (ignoring the previous broken installation)::

pip install --exists-action=i scikit-learn
0