dbscan
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Probably the fastest C++ dbscan library.
Density-based spatial clustering of applications with noise (DBSCAN)
This is a fast C++ implementation of dbscan clustering algorithm.
Compiling and running the example:
g++ example.cpp dbscan.cpp -I vendor/ -std=c++20 -o example
./example sample2d.csv 0.2 10 > output.csv
Or run with three dimensional data:
./example sample3d.csv 1 10 > output.csv