基于联合子空间与多源适应学习的多标签视觉分类

传统的视觉分类方法普遍忽视了多标签间的相关性和大量相关源数据的判别信息.为此,基于共享子空间和领域适应学习方法,针对多标签视觉分类问题,提出了一种新的联合子空间和多源适应学习的多标签视觉分类方法,简称为多源适应多标签学习(Multi-Source adaptation Multi-Label learning,MSML).MSML将综合考虑多标签相关性、灵活的特征相似性嵌入和多源模型的适应学习等目标,并将其融为一个统一的学习模型,其全局最优解只需通过一个广义特征分解问题的求解便可获得.在视频概念识别、自动图像标注等实际应用中进行比较分析,结果显示了本文方法的有效性和优越性.

多源适应多标签分类框架

多源适应学习是一种旨在提升目标学习性能的有效机器学习方法。针对多标签视觉分类问题,基于现有的研究进展,研究提出一种新颖的联合特征选择和共享特征子空间学习的多源适应多标签分类框架,在现有的图Laplacian正则化半监督学习范式中充分考虑目标视觉特征的优化处理,多标签相关信息在共享特征子空间的嵌入,以及多个相关领域的判别信息桥接利用等多个方面,并将其融为一个统一的学习模型,理论证明了其局部最优解只需通过求解一个广义特征分解问题便可分别获得,并给出了算法实现及其收敛性定理。在两个实际的多标签视觉数据分类上分别进行深入实验分析,证实了所提框架的鲁棒有效性和优于现有相关方法的分类性能。

Data⁃Based Feedback Relearning Algorithm for Robust Control of SGCMG Gimbal Servo System with Multi⁃source Disturbance

Single gimbal control moment gyroscope(SGCMG)with high precision and fast response is an important attitude control system for high precision docking,rapid maneuvering navigation and guidance system in the aerospace field.In this paper,considering the influence of multi-source disturbance,a data-based feedback relearning(FR)algorithm is designed for the robust control of SGCMG gimbal servo system.Based on adaptive dynamic programming and least-square principle,the FR algorithm is used to obtain the servo control strategy by collecting the online operation data of SGCMG system.This is a model-free learning strategy in which no prior knowledge of the SGCMG model is required.Then,combining the reinforcement learning mechanism,the servo control strategy is interacted with system dynamic of SGCMG.The adaptive evaluation and improvement of servo control strategy against the multi-source disturbance are realized.Meanwhile,a data redistribution method based on experience replay is designed to reduce data correlation to improve algorithm stability and data utilization efficiency.Finally,by comparing with other methods on the simulation model of SGCMG,the effectiveness of the proposed servo control strategy is verified.