Datenschutzerkl├Ąrung|Data Privacy
Impressum

10.10.2018
K. Forster

"Sharing hash codes for multiple purposes" has been published in Japanese Journal of Statistics and Data Science

"Sharing hash codes for multiple purposes", Wiktor Pronobis, Danny Panknin, Johannes Kirschnick, Vignesh Srinivasan, Wojciech Samek, Volker Markl, Manohar Kaul, Klaus-Robert M├╝ller, Shinichi Nakajima . 2018. In Japanese Journal of Statistics and Data Science, Vol 1, Number 1, 2018.

DOI 10.1007/s42081-018-0010-x

Abstract : Locality sensitive hashing (LSH) is a powerful tool in data science, which enables sublinear-time approximate nearest neighbor search. A variety of hashing schemes have been proposed for different dissimilarity measures. However, hash codes significantly depend on the dissimilarity, which prohibits users from adjusting the dissimilarity at query time. In this paper, we propose multiple purpose LSH (mp-LSH) which shares the hash codes for different dissimilarities. mp-LSH supports L2, cosine, and inner product dissimilarities, and their corresponding weighted sums, where the weights can be adjusted at query time. It also allows us to modify the importance of pre-defined groups of features. Thus, mp-LSH enables us, for example, to retrieve similar items to a query with the user preference taken into account, to find a similar material to a query with some properties (stability, utility, etc.) optimized, and
to turn on or off a part of multi-modal information (brightness, color, audio, text, etc.) in image/video retrieval. We theoretically and empirically analyze the performance of three variants of mp-LSH, and demonstrate their usefulness on real-world data sets.