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arxiv: 2605.09801 · v1 · submitted 2026-05-10 · 💻 cs.RO

Recognition: 2 theorem links

· Lean Theorem

Efficient Multi-Robot Motion Planning with Precomputed Translation-Invariant Edge Bundles

Alessandro Roncone, Aritra Chakrabarty, Bradley Hayes, Himanshu Gupta, Paul Motter, Rishabh Sodani, Srikrishna Bangalore Raghu, Zachary Sunberg

Pith reviewed 2026-05-12 02:35 UTC · model grok-4.3

classification 💻 cs.RO
keywords multi-robot motion planningkinodynamic planningsampling-based planningprecomputed trajectoriestranslation-invariant bundlesaction selectionscalable MRMPplanner-agnostic extension
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The pith

A library of precomputed translation-invariant trajectory segments guides action selection to make multi-robot motion planning faster and more scalable.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This paper introduces a method that precomputes a library of reusable motion segments and uses them to steer the choices made by existing sampling-based planners when they search for paths for several robots. The segments are built so they stay valid under any translation of the starting position, letting the planner apply them directly during online search. The technique leaves collision checking, cost evaluation, and state propagation untouched, so it works with any base planner and keeps that planner's original guarantees. Gains appear most clearly in multi-robot cases because the segments help the search navigate the many tight timing and position constraints that arise when robots must avoid one another. Experiments across several robot models and three standard multi-robot planning styles show shorter solution times and the ability to handle larger teams.

Core claim

KiTE-Extend supplies a planner-agnostic action selection layer that draws from an offline library of translation-invariant trajectory segments; by directing the sampler toward promising motion pieces, it lets the underlying planner explore feasible regions more efficiently in the presence of dense robot-robot constraints, without any modification to propagation, collision, or cost functions, thereby lowering planning time and raising the number of robots that can be handled in centralized, prioritized, and conflict-based frameworks.

What carries the argument

The offline library of translation-invariant edge bundles, which supplies reusable trajectory segments that remain valid after any spatial shift and are used solely to select the next action during online search.

If this is right

  • Centralized, prioritized, and conflict-based multi-robot planners can solve instances with more robots before the allotted time expires.
  • The same library produces modest speed-ups for single-robot problems but larger speed-ups once inter-robot constraints become dense.
  • No changes are required to the theoretical completeness or optimality properties of the planner that receives the new action-selection step.
  • The approach remains compatible with any sampling-based kinodynamic planner that already performs state propagation and collision checks.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same precomputation idea could be tried for other symmetries such as rotation or scaling when the motion primitives are known to repeat under those transforms.
  • Because the library is built once and then reused, the method may support frequent replanning in changing environments if the segments remain useful after small scene edits.
  • Hardware experiments on physical robots would reveal whether the simulated benefits survive unmodeled dynamics and perception noise.
  • The technique might combine with learned cost functions to further bias the selection of segments toward low-cost regions.

Load-bearing premise

A single fixed library of translation-invariant trajectory segments computed once offline will continue to steer planning effectively for many different robot dynamics, scene layouts, and densities of robot interactions without any further adaptation.

What would settle it

Apply the same library to a kinodynamic system or environment outside the tested set and measure whether planning time stays the same or increases compared with the unmodified base planner.

Figures

Figures reproduced from arXiv: 2605.09801 by Alessandro Roncone, Aritra Chakrabarty, Bradley Hayes, Himanshu Gupta, Paul Motter, Rishabh Sodani, Srikrishna Bangalore Raghu, Zachary Sunberg.

Figure 1
Figure 1. Figure 1: Example multi-robot solution for 30 quadcopters with double￾integrator dynamics in a cluttered environment. KCBS is used for high-level coordination, with KiTE-Extend guided RRT as the low￾level kinodynamic planner. Colored curves denote agent trajectories, with matching-colored markers indicating start and goal states; gray prisms represent static obstacles. choices, and completeness typically requires ex… view at source ↗
Figure 2
Figure 2. Figure 2: Ranked edge-bundle expansion in KiTE-Extend. Top: From a given tree node, KiTE ranks precomputed, dynamically feasible trajectory segments by the distance of their endpoints to the sampled state xrand and attempts them in order, skipping infeasible edges caused by obstacles. Bottom: Under agent collision constraints, the same mechanism naturally favors safe alternatives, including near-zero-velocity trajec… view at source ↗
Figure 3
Figure 3. Figure 3: Benchmark environments. The goal region of each vehicle is a circle/sphere of the same color. Tmin ≜ mini Ti , truncating longer segments accordingly and evaluating interactions at the shared discrete time instants. The joint extension is accepted only if all truncated agent segments are individually valid and no collisions occur between any pair of agents at any discrete time t ∈ [0, Tmin]. 2) Prioritized… view at source ↗
Figure 4
Figure 4. Figure 4: Average total solution path time (seconds, y-axis) versus number of agents (x-axis) across environments and dynamical models. Darker curves correspond to KiTE-Extend variants, which consistently achieve lower solution times than their baseline counterparts. the baseline coordination strategy. For cRRT, KiTE-Extend primarily improves scalability and feasibility in hard multi￾agent regimes; for pRRT and KCBS… view at source ↗
Figure 5
Figure 5. Figure 5: Detailed results for selected environments in experiments with the Unicycle model. Each row corresponds to one [PITH_FULL_IMAGE:figures/full_fig_p014_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Detailed results for selected environments in experiments with the Unicycle model (continued). Each row corresponds [PITH_FULL_IMAGE:figures/full_fig_p015_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Detailed results for selected environments in experiments with the Second Order Car model. Each row corresponds to [PITH_FULL_IMAGE:figures/full_fig_p018_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Detailed results for selected environments in experiments with the Second Order Car model (continued). Each row [PITH_FULL_IMAGE:figures/full_fig_p019_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: Detailed results for selected environments in experiments with the Double Integrator model. Each row corresponds to [PITH_FULL_IMAGE:figures/full_fig_p022_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Detailed results for selected environments in experiments with the Second Order Car model. Each row corresponds to [PITH_FULL_IMAGE:figures/full_fig_p025_10.png] view at source ↗
read the original abstract

Solving multi-robot motion planning (MRMP) requires generating collision-free kinodynamically feasible trajectories for multiple interacting robots. We introduce Kinodynamic Translation-Invariant Edge Bundles or KiTE-Extend, a planner-agnostic action selection mechanism for sampling-based kinodynamic motion planning. KiTE-Extend uses a library of trajectory segments computed offline to guide action selection during online planning, improving the ability of existing planners to identify feasible motion segments without altering state propagation, collision checking, or cost evaluation, and without changing their theoretical guarantees. While KiTE-Extend can modestly improve single-agent planners, its benefits are most clear in the multi-agent setting, where it is able to explore more effectively and significantly improve planning through the dense spatiotemporal constraints introduced by robot-robot interaction. Through experiments on multiple kinodynamic systems and environments, we show that KiTE-Extend reduces planning time and improves scalability across the three most common MRMP paradigms: centralized, prioritized, and conflict-based.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 0 minor

Summary. The manuscript introduces KiTE-Extend, a planner-agnostic action selection mechanism for sampling-based kinodynamic multi-robot motion planning. It uses a precomputed library of translation-invariant trajectory segments to guide online action selection in existing planners, without modifying state propagation, collision checking, cost evaluation, or theoretical guarantees. Experiments on multiple kinodynamic systems and environments are claimed to show reduced planning time and improved scalability across centralized, prioritized, and conflict-based MRMP paradigms.

Significance. If the results hold, the work offers a practical enhancement to MRMP by leveraging offline precomputation to better navigate dense robot-robot constraints, while remaining compatible with standard planners. This could improve scalability for larger teams without sacrificing correctness, addressing a core computational bottleneck in the field.

major comments (1)
  1. The central claim that the fixed offline library provides effective guidance for improved scalability rests on its generalizability. The method description does not include explicit analysis or additional experiments testing performance under increased robot density, altered obstacle scales, or dynamics shifts beyond the precomputation conditions; this is load-bearing because invalid segment proposals would negate time gains while preserving correctness.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the constructive review and for recognizing the potential significance of KiTE-Extend as a planner-agnostic enhancement to kinodynamic MRMP. We address the major comment point by point below, providing clarification on the role of translation invariance and the scope of our experimental evaluation.

read point-by-point responses
  1. Referee: The central claim that the fixed offline library provides effective guidance for improved scalability rests on its generalizability. The method description does not include explicit analysis or additional experiments testing performance under increased robot density, altered obstacle scales, or dynamics shifts beyond the precomputation conditions; this is load-bearing because invalid segment proposals would negate time gains while preserving correctness.

    Authors: We agree that generalizability of the offline library is central to the scalability claims and appreciate the opportunity to clarify. The design of KiTE-Extend centers on translation-invariant trajectory bundles, which are precomputed once for a given kinodynamic system and can then be rigidly translated to any workspace location. This invariance ensures that segment proposals remain dynamically valid and collision-free (subject to online checking) independent of absolute position, directly supporting reuse across different robot placements without invalidating the time savings. Our experiments evaluate the approach on multiple distinct kinodynamic systems (each with its own precomputed library) and several environments featuring varied obstacle layouts and scales. Scalability results are reported while systematically increasing team size, which inherently increases robot-robot interaction density; consistent planning-time reductions are observed in these denser regimes across centralized, prioritized, and conflict-based paradigms. We do not assert invariance to arbitrary dynamics parameter shifts or untested obstacle scales outside the evaluated conditions. To make these aspects more explicit, we will revise the manuscript to add a dedicated discussion subsection on generalizability, supported by references to the existing multi-system and multi-environment results and any clarifying analysis that can be extracted from the current data. revision: yes

Circularity Check

0 steps flagged

No significant circularity in derivation chain

full rationale

The paper introduces KiTE-Extend as an offline-precomputed library of translation-invariant trajectory segments used to guide online action selection in sampling-based MRMP planners. The abstract and description contain no equations, derivations, or claims that reduce the reported planning-time reductions or scalability improvements to fitted parameters, self-referential quantities, or inputs by construction. Benefits are presented as arising from improved exploration under robot-robot constraints, demonstrated via experiments across centralized, prioritized, and conflict-based paradigms on multiple systems, without altering planner guarantees or relying on load-bearing self-citations for the core mechanism.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The approach rests on domain assumptions about translation invariance of trajectory segments and the utility of offline precomputation for online guidance; no free parameters or invented physical entities are mentioned in the abstract.

axioms (2)
  • domain assumption Trajectory segments exhibit translation invariance sufficient for bundling across the tested kinodynamic systems
    Enables the offline library to be reused by shifting segments during online planning.
  • domain assumption Consulting the precomputed library improves exploration without violating the original planner's completeness or optimality guarantees
    Core to the planner-agnostic claim stated in the abstract.

pith-pipeline@v0.9.0 · 5494 in / 1357 out tokens · 44684 ms · 2026-05-12T02:35:51.756719+00:00 · methodology

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Lean theorems connected to this paper

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Reference graph

Works this paper leans on

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