[kmaehashi]

As a maintainer of CuPy and also as a user of several GPU-powered Python libraries, I empathize with the frustrations and difficulties here. Indeed, one thing CuPy values is to make the installation step as easy and universal as possible. We strive to keep the binary package footprint small (currently less than 100 MiB), keep dependencies to a minimum, support wide variety of platforms including Windows and aarch64, and do not require a specific CUDA Toolkit version.

If anyone reading this message has encountered a roadblock while installing CuPy, please reach out. I'd be glad to help you.