type object 'cupy.core.core.broadcast' has no attribute '__reduce_cython__'

After a normal chainer and cupy(cupy-cuda100) installation with fresh python 3.7.2,i got following error when running waifu2x-chainer…

D:\waifu2x-chainer-master>python waifu2x.py Traceback (most recent call last): File "waifu2x.py", line 5, in <module> import chainer File "C:\Program Files\Python37\lib\site-packages\chainer\__init__.py", line 21, in <module> from chainer import training # NOQA File "C:\Program Files\Python37\lib\site-packages\chainer\training\__init__.py", line 3, in <module> from chainer.training import updaters # NOQA File "C:\Program Files\Python37\lib\site-packages\chainer\training\updaters\__init__.py", line 1, in <module> from chainer.training.updaters.multiprocess_parallel_updater import MultiprocessParallelUpdater # NOQA File "C:\Program Files\Python37\lib\site-packages\chainer\training\updaters\multiprocess_parallel_updater.py", line 13, in <module> from cupy.cuda import nccl File "C:\Program Files\Python37\lib\site-packages\cupy\__init__.py", line 11, in <module> from cupy import core # NOQA File "C:\Program Files\Python37\lib\site-packages\cupy\core\__init__.py", line 1, in <module> from cupy.core import core # NOQA File "cupy\core\core.pyx", line 2602, in init cupy.core.core AttributeError: type object 'cupy.core.core.broadcast' has no attribute '__reduce_cython__' All packages are automatically installed by wheel. Install cython 0.29.2 does not solve this… Windows 10 1809

[sorenwacker]

So, what is the correct way of installing it? I get the same error when using conda. And the cuda toolkit is already installed.

[eebssk1]

i have installed CUDA Toolkit 10 and set C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v10.0\bin in path.Now waifu2x runs properly! i did not know CUDA Toolkit need to be installed before…