"provided PTX was compiled with an unsupported toolchain" error using CUB

It indicates a mismatch between driver and compilation toolchain. Not having any other details (GPU in use, CUDA version in use from nvcc --version, GPU driver version) from you, I can’t be specific. My recommendation (based on the 11.2 in your cub path) would be to update your driver to the latest one available for your GPU. If your driver is less 460.39, I would update your driver.

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