When I installed OpenCV using Homebrew (brew), I got this problem whenever I run this command to test python -c "import cv2":
RuntimeError: module compiled against API version 9 but this version of numpy is 6 Traceback (most recent call last): File "<string>", line 1, in <module> ImportError: numpy.core.multiarray failed to import I tried to upgrade NumPy, but this is confusing:
>>> import numpy >>> print numpy.__version__ 1.6.1 When I run brew to upgrade NumPy, I got this problem:
brew install -u numpy Warning: numpy-1.9.1 already installed When I uninstalled it:
sudo pip install numpy Requirement already satisfied (use --upgrade to upgrade): numpy in ./anaconda/lib/python2.7/site-packages I have followed this question and deleted Anaconda from my mac.
pip install numpy Requirement already satisfied (use --upgrade to upgrade): numpy in /Library/Python/2.7/site-packages But nothing have changed. How can I link the NumPy version to OpenCV?
12 Answers
When you already have an older version of NumPy, use this:
pip install numpy --upgrade If it still doesn't work, try:
pip install numpy --upgrade --ignore-installed Because we have two NumPy installations in the system. One is installed by Homebrew and the second is installed by pip. So in order to solve the problem, we need to delete one and use the default NumPy install by OpenCV.
Check the path,
import numpy print numpy.__path__ and manually delete it using rm.
The error you mentioned happens when you have two versions of NumPy on your system. As you mentioned, the version of NumPy you imported is still not upgraded since you tried to upgrade it through pip (it will upgrade the version existing in '/Library/Python/2.7/site-packages' ).
However Python still loads the packages from '/System/Library/Frameworks/ where the pre-installed packages live.
In order to upgrade that version you have to use easy_install. The other way around this problem is using virtualenv and setting up a new environment with all the requirements you need.
Update numpy
For python 2
pip install numpy --upgrade You would also needed to upgrade your tables as well for updated version of numpy. so,
pip install tables --upgrade For python 3
pip3 install numpy --upgrade Similarly, the tables for python3 :-
pip3 install tables --upgrade note:
You need to check which python version are you using. pip for python 2.7+ or pip3 for python 3+
FYI, when you using or importing TensorFlow, a similar error may occur, like (caused by NumPy):
RuntimeError: module compiled against API version 0xa but this version of numpy is 0x9 Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/local/lib/python2.7/dist-packages/tensorflow/__init__.py", line 23, in <module> from tensorflow.python import * File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/__init__.py", line 60, in <module> raise ImportError(msg) ImportError: Traceback (most recent call last): File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/__init__.py", line 49, in <module> from tensorflow.python import pywrap_tensorflow File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/pywrap_tensorflow.py", line 28, in <module> _pywrap_tensorflow = swig_import_helper() File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/pywrap_tensorflow.py", line 24, in swig_import_helper _mod = imp.load_module('_pywrap_tensorflow', fp, pathname, description) ImportError: numpy.core.multiarray failed to import Error importing tensorflow. Unless you are using bazel, you should not try to import tensorflow from its source directory; please exit the tensorflow source tree, and relaunch your python interpreter from there. I followed Elmira's and Drew's solution, sudo easy_install numpy, and it worked!
sudo easy_install numpy Searching for numpy Best match: numpy 1.11.3 Removing numpy 1.8.2 from easy-install.pth file Adding numpy 1.11.3 to easy-install.pth file Using /usr/local/lib/python2.7/dist-packages Processing dependencies for numpy Finished processing dependencies for numpy After that I could use TensorFlow without error.
I tried doing sudo pip uninstall numpy instead, because the rm didn't work at first.
Hopefully that helps.
Uninstalling then to install it again.
Because you have multiple versions of NumPy installed.
Try pip uninstall numpy and pip list | grep numpy several times, until you see no output from pip list | grep numpy.
Then pip install numpy will get you the newest version of NumPy.
This works for me:
pip install numpy --upgrade If you don't encounter any permission errors with
pip install -U numpy try:
pip install --user -U numpy All the same.
sudo easy_install numpy My Traceback
Searching for numpy Best match: numpy 1.13.0 Adding numpy 1.13.0 to easy-install.pth file Using /Library/Python/2.7/site-packages Processing dependencies for numpy After installing pytorch, I got a similar error when I used:
import torch Removing NumPy didn't help (I actually renamed NumPy, so I reverted back after it didn't work). The following commands worked for me:
sudo pip install numpy --upgrade sudo easy_install numpy If you are stuck with a machine where you don't have root access, then it is better to deal with a custom Python installation.
The Anaconda installation worked like a charm:
After installation,
[bash]$ /xxx/devTools/python/anaconda/bin/pip list --format=columns | grep numpy
numpy 1.13.3 numpydoc 0.7.0
