8000 PIP Package: Missed dependency? · Issue #9519 · scikit-learn/scikit-learn · GitHub
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gordio opened this issue Aug 10, 2017 · 3 comments
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PIP Package: Missed dependency? #9519

gordio opened this issue Aug 10, 2017 · 3 comments

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@gordio
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gordio commented Aug 10, 2017 •
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Description

After installing sklearn with pip, I can't import it. After manually installing scipy (pip install scipy) import work without errors.

Steps/Code to Reproduce

mkdir test && cd test
python3 -m venv venv
. venv/bin/activate
pip install sklearn
python -c 'import sklearn''

Actual Results

>>> import sklearn
Traceback (most recent call last):
  File "<input>", line 1, in <module>
    import sklearn
  File "/Users/gordio/Development/polo_bot/venv/lib/python3.6/site-packages/sklearn/__init__.py", line 57, in <module>
    from .base import clone
  File "/Users/gordio/Development/polo_bot/venv/lib/python3.6/site-packages/sklearn/base.py", line 10, in <module>
    from scipy import sparse
ModuleNotFoundError: No module named 'scipy'

Versions

Darwin-16.7.0-x86_64-i386-64bit
Python 3.6.2 (default, Jul 17 2017, 16:44:45)
[GCC 4.2.1 Compatible Apple LLVM 8.1.0 (clang-802.0.42)]
NumPy 1.13.1
SciPy 0.19.1 (It's after manual installation)
Scikit-Learn 0.18.2
@rth
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rth commented Aug 10, 2017

pip install sklearn

This should be pip install scikit-learn, see #8215

Also you need a working install with numpy and scipy before installing scikit-learn with pip (cf the docs). These seem to be installed in your system Python environment but not in the virtual environement. You could probably use the virtualenv with the --system-site-packages to access them from the virtualenv, but if you need scikit-learn in a virtualenv it's probably simpler to use conda that will handle the dependencies,

conda create -n test-env scikit-learn==0.18.1 python=3.6

@amueller
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we do not declare scipy and numpy dependencies in setup.py for what I consider historic reasons. I'm not sure if there's an issue open for that right now.
It might be a bit tricky to allow pip install without having numpy installed, but I think we should at least be able to install without scipy installed.

@lesteve lesteve mentioned this issue Jan 2, 2018
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@amueller
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closed by #10402.

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@gordio @amueller @rth
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