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Ekaterini Ioannou

Software Technology and Network Applications Laboratory

Department of Electronic & Computer Engineering
Technical University of Crete
University Campus
73100, Crete, HELLAS

ioannou AT softnet.tuc.gr
EkateriniIoannou AT acm.org

To Compare or Not to Compare: Making Entity Resolution more Efficient

Georgios Papadakis, Ekaterini Ioannou, Claudia Niederée, Themis Palpanas, and Wolfgang Nejdl.
In Proceedings of the ACM/IEEE Joint Conference on Digital Libraries (JCDL), 13-17 June 2011, Ottawa, Canada.


Entity resolution is the task of identifying entities that refer to the same real-world object. It has important applications in the context of digital libraries, such as citation matching and author disambiguation. Blocking is an established methodology for efficiently addressing this problem; it clusters similar entities together, and compares solely entities inside each cluster. In order to effectively deal with the current large, noisy and heterogeneous data collections, novel blocking methods that rely on redundancy have been introduced: they associate each entity with multiple blocks in order to increase recall, thus increasing the computational cost, as well.
In this paper, we introduce novel techniques that remove the superfluous comparisons from any redundancy-based blocking method. They improve the time-efficiency of the latter without any impact on the end result. We present the optimal solution to this problem that discards all redundant comparisons at the cost of quadratic space complexity. For applications with space limitations, we also present an alternative, lightweight solution that operates at the abstract level of blocks in order to discard a significant part of the redundant comparisons. We evaluate our techniques on two large, real-world data sets and verify the significant improvements they convey when integrated into existing blocking methods.


     author = {George Papadakis and Ekaterini Ioannou and Claudia Nieder{\'e}e and Themis Palpanas and Wolfgang Nejdl},
     title ={Eliminating the Redundancy in Blocking-based Entity Resolution Methods},
     booktitle = {JCDL},
     year = {2011}

Last modified: June 2011