Why do I get ModuleNotFoundError for import cupy?

Question

I installed cupy using pip install cupy-cuda90. The installation went successfully (after installing MSVC 2017) and pip list shows cupy-cuda90.

When I type import cupy I get the following error:

Traceback (most recent call last):

File "<ipython-input-1-329ec5cf1bc8>", line 1, in <module>
import cupy

ModuleNotFoundError: No module named 'cupy'

I am on Windows 10 (1607), CUDA 9.0 is installed, and CUDA_PATH & CUDA_PATH_V9_0 point to the right directory.

Answer 1

问题解决了。

虽然我从特定的win python安装开始pip，但安装了另一个python解释器，该解释器是在PATH环境变量中设置的。因此pip.exe只是使用了其他python解释器，并在那里安装了CuPy。