Rips complexes are important structures for analyzing topological features of metric spaces. Unfortunately, generating these complexes constitutes an expensive task because of a combinatorial explosion in the complex size. For n points in R^d, we present a scheme to construct a 4.24-approximation of the multi-scale filtration of the Rips complex in the L-infinity metric, which extends to a O(d^{0.25})-approximation of the Rips filtration for the Euclidean case. The k-skeleton of the resulting approximation has a total size of n2^{O(d log k)}. The scheme is based on the integer lattice and on the barycentric subdivision of the d-cube.
@InProceedings{choudhary_et_al:LIPIcs.ESA.2017.28, author = {Choudhary, Aruni and Kerber, Michael and Raghvendra, Sharath}, title = {{Improved Approximate Rips Filtrations with Shifted Integer Lattices}}, booktitle = {25th Annual European Symposium on Algorithms (ESA 2017)}, pages = {28:1--28:13}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-049-1}, ISSN = {1868-8969}, year = {2017}, volume = {87}, editor = {Pruhs, Kirk and Sohler, Christian}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ESA.2017.28}, URN = {urn:nbn:de:0030-drops-78259}, doi = {10.4230/LIPIcs.ESA.2017.28}, annote = {Keywords: Persistent homology, Rips filtrations, Approximation algorithms, Topological Data Analysis} }
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