自适应高效深度跨模态增量哈希检索算法

Adaptively Efficient Deep Cross-Modal Hash Retrieval Based on Incremental Learning

针对现阶段深度跨模态哈希检索算法无法较好地检索训练数据类别以外的数据及松弛哈希码离散化约束造成的次优解等问题,提出自适应深度跨模态增量哈希检索算法,保持训练数据的哈希码不变,直接学习新类别数据的哈希码。同时,将哈希码映射到潜在子空间中保持多模态数据之间的相似性和非相似性,并提出离散约束保持的跨模态优化算法来求解最优哈希码。此外,针对目前深度哈希算法缺乏有效的复杂度评估方法,提出基于神经网络神经元更新操作的复杂度分析方法,比较深度哈希算法的复杂度。公共数据集上的实验结果显示,所提算法的训练时间低于对比算法,同时检索精度高于对比算法。

To address the problems that current deep learning-based cross-modal hash retrieval algorithms cannot retrieve new category data and sub-optimal solution caused by relaxing discretization constraint of hash codes,an adaptive deep incremental hashing(ADIH)retrieval algorithm is proposed to directly learn the hash codes of newly coming data meanwhile keeping the old trained data unchanged.In order to preserve the similarity and dissimilarity among multi-modal data,hash codes will be projected into latent semantic space where binary constrained discrete cross-modal hash algorithm is introduced to optimize hash code without using any relaxation.Besides,considering that there is currently no effective method which can be used to evaluate complexity of deep hashing methods,a novel method based on neuron updating operation is proposed to analyze the complexity.The experimental results on the public datasets show that the training time of the proposed algorithm is much lower than that of the comparison algorithms,and the retrieval accuracy is higher than that of the comparisons.