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PAMI:SSHash

Jun Wang, Sanjiv Kumar, Shih-Fu Chang. Semi-Supervised Hashing for Large Scale Search. Pattern Analysis and Machine Intelligence, IEEE Transactions on, 2012.

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Abstract

Hashing based approximate nearest neighbor (ANN) search in huge databases has become popular owing to its computational and memory efficiency. The popular hashing methods, e.g., Locality Sensitive Hashing and Spectral Hashing, construct hash functions based on random or principal projections. The resulting hashes are either not very accurate or inefficient. Moreover these methods are designed for a given metric similarity. On the contrary, semantic similarity is usually given in terms of pairwise labels of samples. There exist supervised hashing methods that can handle such semantic similarity but they are prone to overfitting when labeled data is small or noisy. In this work, we propose a semi-supervised hashing (SSH) framework that minimizes empirical error over the labeled set and an information theoretic regularizer over both labeled and unlabeled set. Based on this framework, we present three different semi-supervised hashing methods, including orthogonal hashing, non-orthogonal hashing, and sequential hashing. Particularly, the sequential hashing method generates robust codes in which each hash function is designed to correct the errors made by the previous ones. We further show that the sequential learning paradigm can be extended to unsupervised domains where no labeled pairs are available. Extensive experiments on four large datasets (up to 80 million samples) demonstrate the superior performance of the proposed SSH methods over state-of-the-art supervised and unsupervised hashing techniques

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Jun Wang
Shih-Fu Chang

BibTex Reference

@article{PAMI:SSHash,
   Author = {Wang, Jun and Kumar, Sanjiv and Chang, Shih-Fu},
   Title = {Semi-Supervised Hashing for Large Scale Search},
   Journal = {Pattern Analysis and Machine Intelligence, IEEE Transactions on},
   Year = {2012}
}

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