set_cuda_envs.sh

#!/usr/bin/env bash
set -ex

echo CU_VERSION is "${CU_VERSION}"
echo CUDA_VERSION is "${CUDA_VERSION}"

# Currenly, CU_VERSION and CUDA_VERSION are not consistent.
# to understand this code, please checck out https://github.com/pytorch/vision/issues/4443
version="cpu"
if [[ ! -z "${CUDA_VERSION}" ]] ; then
    version="$CUDA_VERSION"
else
    if [[ ${#CU_VERSION} -eq 5 ]]; then
        version="${CU_VERSION:2:2}.${CU_VERSION:4:1}"
    fi
fi

# Don't use if [[ "$version" == "cpu" ]]; then exit 0 fi.
# It would exit the shell. One result is cpu tests would not run if the shell exit.
# Unless there's an error, Don't exit.
if [[ "$version" != "cpu" ]]; then
    # set cuda envs
    export PATH="/c/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v${version}/bin:/c/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v${version}/libnvvp:$PATH"
    export CUDA_PATH_V${version/./_}="C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v${version}"
    export CUDA_PATH="C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v${version}"

    if  [ ! -d "$CUDA_PATH" ]
    then
        echo "$CUDA_PATH" does not exist
        exit 1
    fi

    # check cuda driver version
    for path in '/c/Program Files/NVIDIA Corporation/NVSMI/nvidia-smi.exe' /c/Windows/System32/nvidia-smi.exe; do
        if [[ -x "$path" ]]; then
            "$path" || echo "true";
            break
        fi
    done

    which nvcc
    nvcc --version
    env | grep CUDA
fi