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C++ fused Wigner rotation kernels (gather+rotate+permute) with OpenMP parallelism, compiled via torch.utils.cpp_extension. Falls back to pure PyTorch if compilation fails. Includes unit tests verifying forward/backward correctness against PyTorch reference implementation.
Register umas_fast_cpu execution mode that uses C++ fused Wigner kernels for CPU inference. Includes _EdgeDegreeScatterFunction for reduced backward overhead, and auto-fallback from GPU to CPU backend in maybe_update_settings_backend when CUDA is unavailable.
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