Extended Increasing Cost Tree Search for Non-Unit Cost Domains
Extended Increasing Cost Tree Search for Non-Unit Cost Domains
复制标题
非单位成本域的扩展递增成本树搜索
DOI:
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发表时间:
2018
期刊:
影响因子:
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通讯作者:
Ariel Felner
中科院分区:
文献类型:
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作者:
Thayne T. Walker;Nathan R Sturtevant;Ariel Felner
Multi-agent pathfinding (MAPF) has applications
in navigation, robotics, games and planning. Most
work on search-based optimal algorithms for
MAPF has focused on simple domains with unit
cost actions and unit time steps. Although these
constraints keep many aspects of the algorithms
simple, they also severely limit the domains that
can be used. In this paper we introduce a new definition
of the MAPF problem for non-unit cost and
non-unit time step domains along with new multiagent
state successor generation schemes for these
domains. Finally, we define an extended version
of the increasing cost tree search algorithm (ICTS)
for non-unit costs, with two new sub-optimal variants
of ICTS: epsilon-ICTS and w-ICTS. Our experiments
show that higher quality sub-optimal solutions
are achievable in domains with finely discretized
movement models in no more time than
lower-quality, optimal solutions in domains with
coarsely discretized movement models.