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Add shared CUDA utils and bundle nanoflann headers#589

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akihironitta wants to merge 3 commits intoport-cluster-04-fps-cudafrom
port-cluster-05-cuda-utils
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Add shared CUDA utils and bundle nanoflann headers#589
akihironitta wants to merge 3 commits intoport-cluster-04-fps-cudafrom
port-cluster-05-cuda-utils

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Add utils.cuh with explicit scalar comparison helpers to work around
NVCC error #3343-D (ambiguous operator overloads with c10::SymInt).
Update fps_kernel.cu to use shared utils. Bundle nanoflann header-only
KD-tree library for CPU knn/radius kernels.
@akihironitta akihironitta force-pushed the port-cluster-05-cuda-utils branch from 3337ec4 to deadaba Compare March 16, 2026 07:37
@akihironitta akihironitta force-pushed the port-cluster-04-fps-cuda branch from 0190d9e to 6ab0a1f Compare March 16, 2026 07:37
@github-actions github-actions bot removed the ci label Mar 16, 2026
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