ロボットタスク計画におけるシーングラフ十分性への情報空間的アプローチ
An Information-Space Perspective to Scene Graph Sufficiency for Robotic Task Planning
シーングラフ上の計画を情報空間で定式化し、タスクに十分な縮約シーングラフの条件を明らかにした。
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著者: Başak Sakçak, Francesco Verdoja
分類: cs.RO
原文アブストラクト
Planning in complex environments requires task specifications grounded in representations that capture objects, relations, and affordances; scene graphs meet this need, but their size in large environments hinders efficient planning. While task-aware pruning and hierarchical abstractions have been explored, a general, task-centric formalization of what constitutes a sufficient scene graph for planning remains open. This paper provides such a formalization by modeling planning over scene graphs within an information-spaces framework through the definition of scene graph transition systems and relevant action semantics for navigation and manipulation. We then introduce derived scene graphs via information mappings that merge and prune nodes and induce quotient transition systems augmented with motion primitives to capture higher-level actions over merged graph nodes. Sufficiency is characterized by two conditions: (i) the information mapping yields a deterministic quotient, and (ii) the task is well-posed over derived traces, ensuring plans found on the derived model are feasible on the maximal system. We illustrate the framework using a task over an example environment, showing both sufficient and insufficient reduced scene graphs.