基于类属属性的多标记学习算法

在多标记学习框架中,每个对象由一个示例(属性向量)描述,却同时具有多个类别标记.在已有的多标记学习算法中,一种常用的策略是将相同的属性集合应用于所有类别标记的预测中.然而,该策略并不一定是最优选择,原因在于每个标记可能具有其自身独有的特征.基于这个假设,目前已经出现了基于标记的类属属性进行建模的多标记学习算法LIFT.LIFT包含两个步骤:属属性构建与分类模型训练.LIFT首先通过在标记的正类与负类示例上进行聚类分析,构建该标记的类属属性;然后,使用每个标记的类属属性训练对应的二类分类模型.在保留LIFT分类模型训练方法的同时,考察了另外3种多标记类属属性构造机制,从而实现LIFT算法的3种变体——LIFT-MDDM,LIFT-INSDIF以及LIFT-MLF.在12个数据集上进行了两组实验,验证了类属属性对多标记学习系统性能的影响以及LIFT采用的类属属性构造方法的有效性.     

Compositional metric learning for multi-label classification

Multi-label classification aims to assign a set of proper labels for each instance, where distance metric learning can help improve the generalization ability of instance-based multi-label classification models. Existing multi-label metric learning techniques work by utilizing pairwise constraints to enforce that examples with similar label assignments should have close distance in the embedded feature space. In this paper, a novel distance metric learning approach for multi-label classification is proposed by modeling structural interactions between instance space and label space. On one hand, compositional distance metric is employed which adopts the representation of a weighted sum of rank-1 PSD matrices based on component bases. On the other hand, compositional weights are optimized by exploiting triplet similarity constraints derived from both instance and label spaces. Due to the compositional nature of employed distance metric, the resulting problem admits quadratic programming formulation with linear optimization complexity w.r.t. the number of training examples.We also derive the generalization bound for the proposed approach based on algorithmic robustness analysis of the compositional metric. Extensive experiments on sixteen benchmark data sets clearly validate the usefulness of compositional metric in yielding effective distance metric for multi-label classification.     

基于神经网络的多示例回归算法

通过重新定义全局误差函数,提出了一种基于神经网络的多示例回归算法,并在基准数据集上对该算法进行了测试,取得了较好的效果.     

基于RSA算法的智能锁设计

提出了一种可通过手机远程分享钥匙的智能锁模型,并提供了一套能使系统完整运行的硬件模型.在如今的智能锁领域,普遍只是将指纹、密码、刷卡、蓝牙开锁功能相结合,却少有钥匙分享功能.为了保障钥匙分享过程中钥匙的保密性和时效性,RSA算法可以较好的满足要求.为了保证系统的完整性,对硬件系统（指纹、刷卡解锁）也提出了一套基于STM32F103型低功耗单片机为控制器的可执行设计方案.实验结果表明系统可以较好的实现钥匙分享的功能.     

粗糙集规则匹配算法及其在文本分类中的应用

为提高中文文本分类的效果,提出了一种基于粗糙集理论的规则匹配方法.在对文本特征的提取过程中,对CHI统计方法进行了适当的改进,并对特征项的权值进行了缩放和离散化.结合区分矩阵实现关于粗糙集理论的属性约简和规则提取,并采用规则预检验的方法对规则匹配的决策参数进行优化,以提高中文文本分类的效果.实验结果表明改进后的规则匹配方法分类准确率更高,同时在训练数据较少的情况下也可以取得不错的效果.     

Stable Label-Specific Features Generation for Multi-Label Learning via Mixture-Based Clustering Ensemble

Multi-label learning deals with objects associated with multiple class labels, and aims to induce a predictive model which can assign a set of relevant class labels for an unseen instance. Since each class might possess its own characteristics, the strategy of extracting label-specific features has been widely employed to improve the discrimination process in multi-label learning, where the predictive model is induced based on tailored features specific to each class label instead of the identical instance representations. As a representative approach, LIFT generates label-specific features by conducting clustering analysis. However, its performance may be degraded due to the inherent instability of the single clustering algorithm. To improve this, a novel multi-label learning approach named SENCE (stable label-Specific features gENeration for multi-label learning via mixture-based Clustering Ensemble) is proposed, which stabilizes the generation process of label-specific features via clustering ensemble techniques. Specifically, more stable clustering results are obtained by firstly augmenting the original instance repre-sentation with cluster assignments from base clusters and then fitting a mixture model via the expectation-maximization (EM) algorithm. Extensive experiments on eighteen benchmark data sets show that SENCE performs better than LIFT and other well-established multi-label learning algorithms.      

一种基于多示例学习的图像检索方法

由于多示例学习能够有效处理图像的歧义性,因此被应用于基于内容的图像检索(CBIR).本文提出一种基于多示例学习的CBIR方法.该方法将图像作为多示例包,使用基于自组织特征映射网络聚类的方法分割图像,并将由颜色和纹理特征描述的图像区域作为包中示例.根据用户选择的实例图像生成正包和反包,使用多示例学习算法进行学习,实现图像检索和相关反馈.实验结果表明这种方法与已有方法检索效果相当,但检索效率更高.     

软土基抗支护设计

根据国家相关规范以及场地地质勘擦资料，设计了开挖深度为5.70m的淤泥质基坑的钻孔灌注桩支护，坑壁止水问题由桩间旋喷水泥浆解决。具体计算了桩的基坑的内外侧最大弯矩，最大剪力，桩的配筋，桩顶位移，以及基坑的整体抗滑稳定性和抗倾覆稳定性。     

基于深度学习的二维人体姿态估计综述

人体姿态估计是计算机视觉领域的一个基础且具有挑战的任务,人体姿态估计对于描述人体姿态、描述人体行为等至关重要,是行为识别、行为检测等计算机视觉任务的基础.近年来,随着深度学习的发展,基于深度学习的人体姿态估计算法展现出了极其优异的效果.从单人人体姿态估计、自顶向下的多人人体姿态估计和自底向上的多人人体姿态估计这3种主流的人体姿态估计方式,介绍近年来基于深度学习的二维人体姿态估计算法的发展,并讨论目前二维人体姿态估计所面临的困难和挑战.最后,对人体姿态估计未来的发展做出展望.     

Preface

Min-Ling Zhang, Xiu-Shen Wei, and Gao Huang. Preface[J].Journal of Computer Science and Technology, 2022, 37(3): 505-506.