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摘要: 图实现(Graph realization)问题研究基于节点间全部或部分距离关系测量, 在$d$维空间中计算图的顶点坐标, 使得在所实现图中各节点之间实现距离与测量距离尽可能一致.图实现问题是一个典型的优化问题, 在传感器网络定位、蛋白质结构重建、数据可视化、社交网络分析、机器人同步定位与构图等领域有着广泛应用.图实现的研究同图刚性理论有着紧密的联系, 图的刚性与全局刚性决定图的可实现性.在可实现图中, 现有工作提出几类典型的代表性图实现算法, 包括: 1)基于三边测距类方法; 2)求解距离方程类方法; 3)基于全局优化类方法; 4)基于模块拼合类方法.本文对图实现的刚性理论, 四类图实现算法的设计思想、适用条件、算法流程等进行综述分析, 通过实验对算法进行准确性、计算复杂度、可靠性等方面的比较和分析.Abstract: The graph realization problem is to calculate vertex coordinates in d-dimensional space based on all or parts of distance measurements between the vertexes, so that the Euclidean distance between any two neighboring nodes in the realized graph is consistent with the measured distance. The graph realization problem is widely used in the fields of sensor network location, protein structure reconstruction, social network analysis and robot simultaneous localization and mapping. Graph realization is closely related to rigidity theory. The rigidity and global rigidity properties determine the realizability of the graph. A series of algorithms were presented to address the graph realization problem, including: 1) trilateration-based algorithm, 2) distance equation based, 3) global optimization based, and 4) module embedding based methods. This paper introduces the representative algorithms in details with their design ideas, applicable conditions. In particular, in sensor network localization applications, we conduct a series of experiments to compare and analyze these algorithms in terms of accuracy, computational complexity and robustness.
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Key words:
- Graph realization /
- network localization /
- optimization /
- component stitching /
- survey /
- rigidity /
- global rigidity
1) 本文责任编委 段书凯 -
表 1 算法分类表
Table 1 Algorithm classification
方法类型 算法 算法特点 三边测量类方法 Trilateration 基于几何性质, 增量式求解结果 距离方程类方法 MDS 求解完全图的实现方法 SDP 以半正定规划求解问题 全局优化类方法 $g^2o$ 基于最小二乘法的迭代搜索方法 SMACOF 基于构造辅助函数的迭代搜索方法 模块拼合类方法 AAAP 将部分模块变形, 以仿射变换拼合模块 ARAP 以迭代搜索的策略, 优化拼合后结果的形状偏差 ASAP 以矩阵特征向量求解模块拼合结果 
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表 2 计算符号说明表
Table 2 Notation list
符号 定义 $n$ 节点数量, $|V|=n$ $m$ 图中边的数量, $|E|=m$ $t$ 迭代次数 $g $ 节点最大度数 $N $ 模块中节点数最大值
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表 3 算法时间复杂度
Table 3 Time complexity of different algorithms
算法名称 时间复杂度 Trilateration ${\rm O}(n^2)$ MDS ${\rm O}(n^2)$ SDP ${\rm O}(n^2m^{2.5}+m^{3.5})$ $g^2o$ ${\rm O}(n^2t)$ SMACOF ${\rm O}(n^2t)$ AAAP ${\rm O}(mn^2)$ ARAP ${\rm O}(mn^2+n^3t)$ ASAP ${\rm O}(nN^2t+mn^2)$
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表 4 算法比较表
Table 4 Algorithm comparison
方法类型 算法 准确性 计算效率 鲁棒性(稠密度) 鲁棒性(噪声) 三边测量类方法 Trilateration $\bigstar$ $\bigstar \bigstar \bigstar \bigstar \bigstar$ $\bigstar \bigstar$ $\bigstar \bigstar$ 距离方程类方法 MDS $\bigstar \bigstar$ $\bigstar \bigstar \bigstar$ $\bigstar$ $\bigstar \bigstar$ SDP $\bigstar \bigstar$ $\bigstar \bigstar \bigstar$ $\bigstar \bigstar$ $\bigstar \bigstar \bigstar$ 全局优化类方法 $g^2o$ $\bigstar \bigstar \bigstar \bigstar \bigstar$ $\bigstar \bigstar$ $\bigstar \bigstar \bigstar \bigstar$ $\bigstar \bigstar \bigstar \bigstar$ SMACOF $\bigstar \bigstar \bigstar \bigstar$ $\bigstar \bigstar$ $\bigstar \bigstar \bigstar \bigstar$ $\bigstar \bigstar \bigstar \bigstar$ 模块拼合类方法 AAAP $\bigstar$ $\bigstar \bigstar \bigstar \bigstar$ $\bigstar \bigstar$ $\bigstar$ ARAP $\bigstar \bigstar \bigstar \bigstar \bigstar$ $\bigstar \bigstar \bigstar \bigstar$ $\bigstar \bigstar \bigstar \bigstar \bigstar$ $\bigstar \bigstar \bigstar \bigstar \bigstar$ ASAP $\bigstar \bigstar \bigstar \bigstar \bigstar$ $\bigstar$ $\bigstar \bigstar \bigstar \bigstar \bigstar$ $\bigstar \bigstar \bigstar \bigstar$
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