Search Results for author: Zhongqiang Ren

Found 14 papers, 6 papers with code

A Mixed-Integer Conic Program for the Moving-Target Traveling Salesman Problem based on a Graph of Convex Sets

no code implementations7 Mar 2024 Allen George Philip, Zhongqiang Ren, Sivakumar Rathinam, Howie Choset

This paper introduces a new formulation that finds the optimum for the Moving-Target Traveling Salesman Problem (MT-TSP), which seeks to find a shortest path for an agent, that starts at a depot, visits a set of moving targets exactly once within their assigned time-windows, and returns to the depot.

Traveling Salesman Problem

DMS*: Minimizing Makespan for Multi-Agent Combinatorial Path Finding

no code implementations11 Dec 2023 Zhongqiang Ren, Anushtup Nandy, Sivakumar Rathinam, Howie Choset

MCPF is challenging as it involves both planning collision-free paths for multiple agents and target sequencing, i. e., solving traveling salesman problems to assign targets to and find the visiting order for the agents.

Heuristic Search for Path Finding with Refuelling

no code implementations19 Sep 2023 Anushtup Nandy, Zhongqiang Ren, Sivakumar Rathinam, Howie Choset

This paper considers a generalization of the Path Finding (PF) with refueling constraints referred to as the Refuelling Path Finding (RF-PF) problem.

Solving Multi-Agent Target Assignment and Path Finding with a Single Constraint Tree

1 code implementation2 Jul 2023 Yimin Tang, Zhongqiang Ren, Jiaoyang Li, Katia Sycara

As a leading approach to address TAPF, Conflict-Based Search with Target Assignment (CBS-TA) leverages both K-best target assignments to create multiple search trees and Conflict-Based Search (CBS) to resolve collisions in each search tree.

Enhanced Multi-Objective A* with Partial Expansion

no code implementations6 Dec 2022 Valmiki Kothare, Zhongqiang Ren, Sivakumar Rathinam, Howie Choset

The Multi-Objective Shortest Path Problem (MO-SPP), typically posed on a graph, determines a set of paths from a start vertex to a destination vertex while optimizing multiple objectives.

MUI-TARE: Multi-Agent Cooperative Exploration with Unknown Initial Position

no code implementations22 Sep 2022 Jingtian Yan, Xingqiao Lin, Zhongqiang Ren, Shiqi Zhao, Jieqiong Yu, Chao Cao, Peng Yin, Ji Zhang, Sebastian Scherer

To intelligently balance the robustness of sub-map merging and exploration efficiency, we develop a new approach for lidar-based multi-agent exploration, which can direct one agent to repeat another agent's trajectory in an \emph{adaptive} manner based on the quality indicator of the sub-map merging process.

Position

Enhanced Multi-Objective A* Using Balanced Binary Search Trees

1 code implementation18 Feb 2022 Zhongqiang Ren, Richard Zhan, Sivakumar Rathinam, Maxim Likhachev, Howie Choset

This work addresses a Multi-Objective Shortest Path Problem (MO-SPP) on a graph where the goal is to find a set of Pareto-optimal solutions from a start node to a destination in the graph.

Subdimensional Expansion Using Attention-Based Learning For Multi-Agent Path Finding

1 code implementation29 Sep 2021 Lakshay Virmani, Zhongqiang Ren, Sivakumar Rathinam, Howie Choset

By leveraging a Visual Transformer, we develop a learning-based single-agent planner, which plans for a single agent while paying attention to both the structure of the map and other agents with whom conflicts may happen.

Multi-Agent Path Finding

Multi-Objective Path-Based D* Lite

no code implementations2 Aug 2021 Zhongqiang Ren, Sivakumar Rathinam, Maxim Likhachev, Howie Choset

Incremental graph search algorithms such as D* Lite reuse previous, and perhaps partial, searches to expedite subsequent path planning tasks.

Multi-objective Conflict-based Search Using Safe-interval Path Planning

1 code implementation2 Aug 2021 Zhongqiang Ren, Sivakumar Rathinam, Maxim Likhachev, Howie Choset

This paper addresses a generalization of the well known multi-agent path finding (MAPF) problem that optimizes multiple conflicting objectives simultaneously such as travel time and path risk.

Multi-Agent Path Finding

MS*: A New Exact Algorithm for Multi-agent Simultaneous Multi-goal Sequencing and Path Finding

no code implementations18 Mar 2021 Zhongqiang Ren, Sivakumar Rathinam, Howie Choset

In multi-agent applications such as surveillance and logistics, fleets of mobile agents are often expected to coordinate and safely visit a large number of goal locations as efficiently as possible.

Multi-Agent Path Finding

Loosely Synchronized Search for Multi-agent Path Finding with Asynchronous Actions

no code implementations8 Mar 2021 Zhongqiang Ren, Sivakumar Rathinam, Howie Choset

Multi-agent path finding (MAPF) determines an ensemble of collision-free paths for multiple agents between their respective start and goal locations.

Computational Efficiency Multi-Agent Path Finding

Subdimensional Expansion for Multi-objective Multi-agent Path Finding

1 code implementation2 Feb 2021 Zhongqiang Ren, Sivakumar Rathinam, Howie Choset

One example of subdimensional expansion, when applied to A*, is called M* and M* was limited to a single objective function.

Computational Efficiency Multi-Agent Path Finding

A Conflict-Based Search Framework for Multi-Objective Multi-Agent Path Finding

1 code implementation11 Jan 2021 Zhongqiang Ren, Sivakumar Rathinam, Howie Choset

Naively applying existing multi-objective search algorithms, such as multi-objective A* (MOA*), to multi-agent path finding may prove to be inefficient as the dimensionality of the search space grows exponentially with the number of agents.

Multi-Agent Path Finding

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