A multiple-path gradient projection method for solving the logit-based stochastic user equilibrium model

A multiple-path gradient projection method for solving the logit-based stochastic user equilibrium model
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求解基于logit的随机用户均衡模型的多路径梯度投影法

DOI:
10.5198/jtlu.2020.1600
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发表时间:
2020-11
影响因子:
1.9
通讯作者:
Chun-bin Yu
Chun-bin Yu
中科院分区:
工程技术4区
文献类型:
--
作者:
Heqing Tan;Muqing Du;Chun-bin Yu

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本文提出了一种基于路径的算法,用于解决交通规划和管理中著名的基于逻辑的随机用户均衡(SUE)问题。基于梯度投影(GP)方法,新算法结合了一种新颖的多路径梯度方法来生成下降方向,考虑到每个单一起点-目的地(O-D)对中存在的许多路径。为了应用基于路径的算法,SUE问题被重新表述为变分不等式(VI),并且预先确定工作路径集。数值实验是在提供大量路径的温尼伯网络上进行的。结果表明多路径梯度投影算法优于原始GP方法。涉及三种不同的步长策略,包括固定步长、自调节平均和自适应Armijo策略,以得出更普遍的结论。此外,还分析了路径数对计算性能的影响。当路径集大小变大时,多路径梯度投影(MGP)方法的收敛速度比 GP 方法快得多。
This paper proposes a path-based algorithm for solving the well-known logit-based stochastic user equilibrium (SUE) problem in transportation planning and management. Based on the gradient projection (GP) method, the new algorithm incorporates a novel multiple-path gradient approach to generate the descent direction in consideration of many paths existing in every single origin-destination (O-D) pair. To apply the path-based algorithm, the SUE problem is reformulated as a variational inequality (VI), and a working path set is predetermined. The numerical experiments are conducted on the Winnipeg network where a large number of paths are provided. The results show the multiple-path gradient projection algorithm outperforms the original GP method. Three different step size strategies, including the fixed step size, self-regulated averaging and self-adaptive Armijo’s strategies, are involved to draw a more general conclusion. Also, the effects of the path number on computational performance are analyzed. The multiple-path gradient projection (MGP) method converges much faster than the GP method when the path set size gets large.
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