Scalable Hierarchical Clustering : Twister Tries with a Posteriori Trie Elimination
Cochez, M., & Neri, F. (2015). Scalable Hierarchical Clustering : Twister Tries with a Posteriori Trie Elimination. In SSCI 2015 : Proceedings of the 2015 IEEE Symposium Series on Computational Intelligence. Symposium CIDM 2015 : 6th IEEE Symposium on Computational Intelligence and Data Mining (pp. 756-763). IEEE. doi:10.1109/SSCI.2015.12
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Exact methods for Agglomerative Hierarchical Clustering (AHC) with average linkage do not scale well when the number of items to be clustered is large. The best known algorithms are characterized by quadratic complexity. This is a generally accepted fact and cannot be improved without using specifics of certain metric spaces. Twister tries is an algorithm that produces a dendrogram (i.e., Outcome of a hierarchical clustering) which resembles the one produced by AHC, while only needing linear space and time. However, twister tries are sensitive to rare, but still possible, hash evaluations. These might have a disastrous effect on the final outcome. We propose the use of a metaheuristic algorithm to overcome this sensitivity and show how approximate computations of dendrogram quality can help to evaluate the heuristic within reasonable time. The proposed metaheuristic is based on an evolutionary framework and integrates a surrogate model of the fitness within it to enhance the algorithm
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