| 摘要: |
| 哈希学习通过设计和优化目标函数，并结合数据分布，学习得到样本的哈希码表示.在现有哈希学习模型中，线性模型因其高效、便捷的特性得到广泛应用.针对线性模型在哈希学习中的参数优化问题，提出一种基于相似度驱动的线性哈希模型参数再优化方法.该方法可以在不改变现有模型各组成部分的前提下，实现模型参数的再优化，提升模型检索性能.该方法首先通过运行现有哈希算法多次，获得训练集的多个哈希码矩阵，然后基于相似度保持度量标准和融合准则对多个哈希码矩阵进行优化选择，获得训练集的优化哈希矩阵，最后利用该优化哈希矩阵对原模型的参数进行再优化，进而获得更优的哈希学习算法.实验结果表明，该方法对不同的哈希学习算法性能都有较为显著的提升. |
| 关键词: 内容检索 哈希学习 线性模型 参数优化 相似度驱动 |
| DOI：10.13328/j.cnki.jos.005918 |
| 分类号:TP181 |
| 基金项目:国家自然科学基金（61671274，61876098） |
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| Model Parameter Re-optimization for Linear Hashing Based on Similarity Drive |
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NIE Xiu-Shan1, LIU Xing-Bo2,3, XI Xiao-Ming1, YIN Yi-Long3
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1.School of Computer Science and Technology, Shandong Jianzhu University, Ji'nan 250101, China;2.School of Computer Science and Technology, Shandong University, Qingdao 266237, China;3.School of Software, Shandong University, Ji'nan 250100, China
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| Abstract: |
| By designing and optimizing an objective function, and combining the distribution of samples, hash learning learns the hash codes of samples. In the existing hashing models, linear model is widely used due to its conciseness and high efficiency. For the parameter optimization of linear hashing model, a model parameter re-optimization method is propose based on similarity drive, which can improve the precision of the existing linear model-based hashing algorithms. Given a hashing method, this method is firstly run for several times with obtaining several hash matrices. Then, some bits are selected for these hash matrices to obtain a new final hash matrix based on the similarity preserving degree and a fusion strategy. Finally, this new hash matrix is used to re-optimize the model parameters, and a better hash model is obtained for out-of-sample extension. Extensive experiments are performed based on three benchmark datasets and the results demonstrate the superior performance of the proposed framework. |
| Key words: content retrieval hash learning linear model parameter optimization similarity drive |
