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Bag of indexes: a multi-index scheme for efficient approximate nearest neighbor search

  • 1154T: Content-Based Multimedia Indexing in the era of Artificial Intelligence
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Abstract

During the last years, the problem of Content-Based Image Retrieval (CBIR) was addressed in many different ways, achieving excellent results in small-scale datasets. With growth of the data to evaluate, new issues need to be considered and new techniques are necessary in order to create an efficient yet accurate system. In particular, computational time and memory occupancy need to be kept as low as possible, whilst the retrieval accuracy has to be preserved as much as possible. For this reason, a brute-force approach is no longer feasible, and an Approximate Nearest Neighbor (ANN) search method is preferable. This paper describes the state-of-the-art ANN methods, with a particular focus on indexing systems, and proposes a new ANN technique called Bag of Indexes (BoI). This new technique is compared with the state of the art on several public benchmarks, obtaining 86.09% of accuracy on Holidays+Flickr1M, 99.20% on SIFT1M and 92.4% on GIST1M. Noteworthy, these state-of-the-art accuracy results are obtained by the proposed approach with a very low retrieval time, making it excellent in the trade off between accuracy and efficiency.

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Notes

  1. The C++ code is available on https://www.github.com/fmaglia/BoI

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Acknowledgements

This research benefits from the HPC (High Performance Computing) facility of the University of Parma, Italy.

This is work is partially funded by Regione Emilia Romagna under the “Piano triennale alte competenze per la ricerca, il trasferimento tecnologico e l’imprenditorialità”.

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Authors and Affiliations

  1. IMP lab, University of Parma, Parco Area delle Scienze, 181/A, Parma, Italy

    Federico Magliani, Tomaso Fontanini & Andrea Prati

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  1. Federico Magliani
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  2. Tomaso Fontanini
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  3. Andrea Prati
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Correspondence to Federico Magliani.

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Appendices

Appendix A - LSH projection algorithm

As mentioned in Section 2.3, the hash function used for projecting the vectors is the following:

$$ h(\mathbf{x})=sign(\mathbf{x}\cdot\mathbf{v}) $$
(10)

where x represents the input feature vector and v represents the projecting vector. Before starting the calculation, it is important to generate the vector v for the projection. The values of this vector are sampled from a Gaussian distribution \(\mathcal {N}(0,1)\). The dimensions of this list of vectors depend from the hash dimension (δ), the number of hash tables (L) and the dimension of the input vector. After that, it is possible to calculate the correct bucket using LSH projections. Assuming to have δ = 8 and L = 10, 80 LSH projections will be generated for each image descriptor, but only 10 buckets for each image are obtained for projecting the descriptors (one for each hash table). This is due to the fact that, for each hash table, hash dimension (δ) projections are calculated, so in the end the vectors will projected in only L buckets. Applying more projections for each hash table (thus, increasing the hash dimension δ) allows to improve the robustness of LSH approach and reduce the possibility of projecting different elements in close buckets because increasing the number of bits used (δ) increase the number of possible buckets for the final projection. To summarize, once we have the projection vectors, the dot product between the input vector and the projection vector is computed. If it is greater than zero, the bucket value (index) is increased by a power of two.

B - Memory requirements

The memory requirements of the ANN algorithm depend from the considered number of images. For example, if 1M images are represented by 1M descriptors of 128D (float = 4 bytes) are employed, the brute-force approach requires 0.5Gb (1M x 128 x 4). For the same task, LSH needs only 100 Mb, because it needs to store 1M indexes for each of the L = 100 hash tables, since each index is stored using a single byte (8 bit). In addition, the proposed BoI only requires additional 4 Mb to store 1M weights, allowing to scale better the proposed approach on larger datasets than the brute-force approach.

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Magliani, F., Fontanini, T. & Prati, A. Bag of indexes: a multi-index scheme for efficient approximate nearest neighbor search. Multimed Tools Appl 80, 23135–23156 (2021). https://doi.org/10.1007/s11042-020-10262-4

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