"Cannot import name core" after fresh install (1.5.0.2)

Just installed the latest chainer using pip on Mac OSX, and now I get this error on importing cupy:

In [1]: import cupy
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-9136569de189> in <module>()
----> 1 import cupy

/Users/tsc/anaconda/lib/python2.7/site-packages/cupy/__init__.py in <module>()
      6 
      7 
----> 8 from cupy import binary
      9 from cupy import core
     10 from cupy import creation

/Users/tsc/anaconda/lib/python2.7/site-packages/cupy/binary/__init__.py in <module>()
      3 
      4 # "NOQA" to suppress flake8 warning
----> 5 from cupy.binary import elementwise  # NOQA
      6 from cupy.binary import packing  # NOQA

/Users/tsc/anaconda/lib/python2.7/site-packages/cupy/binary/elementwise.py in <module>()
----> 1 from cupy import core
      2 
      3 
      4 bitwise_and = core.bitwise_and
      5 

/Users/tsc/anaconda/lib/python2.7/site-packages/cupy/core/__init__.py in <module>()
----> 1 from cupy.core import core
      2 
      3 ndarray = core.ndarray
      4 
      5 get_size = core.get_size

ImportError: cannot import name core

It seems like core is now a Cython module, so perhaps the installer is not properly compiling it?

[unnonouno]

That means you failed to install CuPy. Please try pip with -v option, that shows a lot of logs.

$ pip uninstall chainer
$ pip install chainer -v

[tscohen]

Update: After updating Chainer I got errors again. Specifically, when I do a clean install with “pip install chainer --no-cache-dir -vvvv”, I get errors like:

ld: library not found for -lgcc_s.10.5 clang: error: linker command failed with exit code 1 (use -v to see invocation) ************************************************** *** WARNING: Cannot check CUDA version *** WARNING: Cannot build a stub file. Original error: command ‘g++’ failed with exit status 1 **************************************************

In the end I found a solution in italoag’s comment here: https://github.com/nodejs/node/issues/2933

Before installing:

$ cd /usr/local/lib
$ sudo ln -s ../../lib/libSystem.B.dylib libgcc_s.10.5.dylib 

Disclaimer: I have no idea what this is doing, or whether it is safe. Try at your own risk.