GLOBULAR uses HDBSCAN on 13 signal features to cut narrowband-SETI false-positive events by 99.3 percent, while recovering 69 of 100 injected synthetic signals versus 86 for turboSETI alone.
A Hybrid Approach To Hierarchical Density-based Cluster Selection
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abstract
HDBSCAN is a density-based clustering algorithm that constructs a cluster hierarchy tree and then uses a specific stability measure to extract flat clusters from the tree. We show how the application of an additional threshold value can result in a combination of DBSCAN* and HDBSCAN clusters, and demonstrate potential benefits of this hybrid approach when clustering data of variable densities. In particular, our approach is useful in scenarios where we require a low minimum cluster size but want to avoid an abundance of micro-clusters in high-density regions. The method can directly be applied to HDBSCAN's tree of cluster candidates and does not require any modifications to the hierarchy itself. It can easily be integrated as an addition to existing HDBSCAN implementations.
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Anomaly Detection and Radio-frequency Interference Classification with Unsupervised Learning in Narrowband Radio Technosignature Searches
GLOBULAR uses HDBSCAN on 13 signal features to cut narrowband-SETI false-positive events by 99.3 percent, while recovering 69 of 100 injected synthetic signals versus 86 for turboSETI alone.