On Symmetric and Asymmetric LSHs for Inner Product Search
Machine Learning
2015-06-09 v3 Data Structures and Algorithms
Information Retrieval
Machine Learning
Abstract
We consider the problem of designing locality sensitive hashes (LSH) for inner product similarity, and of the power of asymmetric hashes in this context. Shrivastava and Li argue that there is no symmetric LSH for the problem and propose an asymmetric LSH based on different mappings for query and database points. However, we show there does exist a simple symmetric LSH that enjoys stronger guarantees and better empirical performance than the asymmetric LSH they suggest. We also show a variant of the settings where asymmetry is in-fact needed, but there a different asymmetric LSH is required.
Keywords
Cite
@article{arxiv.1410.5518,
title = {On Symmetric and Asymmetric LSHs for Inner Product Search},
author = {Behnam Neyshabur and Nathan Srebro},
journal= {arXiv preprint arXiv:1410.5518},
year = {2015}
}
Comments
11 pages, 3 figures, In Proceedings of The 32nd International Conference on Machine Learning (ICML)