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Set TORCH_CUDA_ARCH_LIST in the CUDA build step to include 12.0+PTX for forward compatibility with Blackwell GPUs (RTX 5070 Ti, 5080, etc). Pre-built PyTorch cu128 wheels only ship native kernels for sm_80/86/89/90. Without this, Blackwell GPU users get "no kernel image is available for execution on the device" at runtime. Fixes #386 Related: #395, #396, #399, #400 Co-authored-by: Matt Van Horn <[email protected]>