Allow users to set paths to CUDA_HOME and CUDA_PATH in env#1
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Some users like us may have CUDA installed in an unusual path. We cannot not change it as non-sudoers.
This pull request updates how CUDA environment variables are set in several Python files to make the code more robust. Instead of unconditionally overwriting existing environment variables, it now uses
os.environ.setdefaultto only setCUDA_HOMEandCUDA_PATHif they are not already defined. This prevents accidental overwriting of user- or system-defined values and improves compatibility across different environments.Environment variable handling improvements:
CUDA_HOMEandCUDA_PATHwithos.environ.setdefaultinautotune_cutlass.py,autotune_cutlass_hopper.py,benchmark.py,kernel_runner.py, andtest_kernels.py, ensuring existing environment values are preserved if already set. [1] [2] [3] [4] [5]