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arxiv: 2604.22551 · v1 · submitted 2026-04-24 · 💻 cs.RO · cs.AI

Recognition: unknown

QDTraj: Exploration of Diverse Trajectory Primitives for Articulated Objects Robotic Manipulation

Faiz Ben Amar, Louis Annabi, Mahdi Khoramshahi, Mathilde Kappel, St\'ephane Doncieux

Authors on Pith no claims yet

Pith reviewed 2026-05-08 11:19 UTC · model grok-4.3

classification 💻 cs.RO cs.AI
keywords robotic manipulationarticulated objectstrajectory primitivesquality diversityrobot learningdomestic robots
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The pith

QDTraj uses quality-diversity search to generate at least five times more varied robot trajectories for activating object joints and sliders than prior methods.

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

The paper introduces QDTraj to automatically create many different low-level movement paths that let a robot activate hinges and sliders on household objects. It does this by running quality-diversity algorithms that explore solutions with only sparse rewards for success, so the paths stay both effective and behaviorally different from each other. This matters for real robots because unexpected obstacles or gripper positions often make a single fixed path fail, while having hundreds of ready options lets the robot pick one that fits the moment. The authors tested the approach across thirty different articulations drawn from a public object dataset and showed it produces far more distinct trajectories per task than standard generation techniques. They also transferred some of the generated paths from simulation to a physical robot arm.

Core claim

QDTraj is a method based on Quality-Diversity algorithms that leverages sparse reward exploration in order to generate a set of diverse and high-performing trajectory primitives for a given manipulation task. It was validated by generating trajectories in simulation for hinge and slider activation tasks across 30 articulations from the PartNetMobility dataset, achieving an average of 704 different trajectories per task, which is at least five times more than compared methods, and deploying them in the real world.

What carries the argument

Quality-Diversity algorithms that use sparse reward signals to search for both high task performance and behavioral variety among candidate robot trajectories.

Load-bearing premise

Trajectories found to be diverse and high-performing in simulation remain effective and selectable under live real-world constraints and unexpected changes without additional adaptation or fine-tuning.

What would settle it

A real-world deployment trial in which none of the QDTraj-generated trajectories can be executed successfully under changing conditions while a non-diverse baseline method still completes the task.

Figures

Figures reproduced from arXiv: 2604.22551 by Faiz Ben Amar, Louis Annabi, Mahdi Khoramshahi, Mathilde Kappel, St\'ephane Doncieux.

Figure 1
Figure 1. Figure 1: Plug-and-play QDTraj exploration algorithm. Given an articu￾lated object URDF and an activation task, QDtraj generates sets of diverse trajectory primitives to achieve the task. Trajectory primitives generated in Genesis parallelized simulation are deployable real world set-up. expensive, which motivates the use of simulated data. Sim￾ulated data, however, can suffer from sim-to-real inconsis￾tencies. To a… view at source ↗
Figure 2
Figure 2. Figure 2: Input/Output of QDtrajAction plug-and-play module As input the Experimental Box URDF and an activation task to accomplish. In orange on the CAD is the axis of revolution of the hinge involved in the task input Γ1, the other joints in black are ignored. As the output a set of trajectory primitives, each trajectory has a grasp starting frame (in yellow) as well as a full trajectory (in gradient orange dot). … view at source ↗
Figure 3
Figure 3. Figure 3: QDtraj selection-mutation loop (1) Each genotype is a FR3 end effector frame (2) Parallelized evaluation in 10 000 Genesis simulated environments, (3) MAP-Elite 3D archive A, each small 3D cell in the 3D grid represents a different behavior descriptor bxyz (4) Selection of individuals (5) Mutation of the genotypes QDTraj algorithm enables the exploration of nelite al￾ternative trajectories to achieve the s… view at source ↗
Figure 4
Figure 4. Figure 4: ). The behavioral descriptor of an individual is defined as the three-dimensional Cartesian starting position of its genotype, b(gi) = bxyz, rounded to the nearest hundredth of a centimeter. We can represent the output archive in 3D space as a grid B composed of small cubes of 1cm side. If two individuals have the same behavioral descriptor, a local competition is performed within their 3D cell, and only t… view at source ↗
Figure 5
Figure 5. Figure 5: Baseline for interaction action spaces Left. VAT-Mart interaction policy Action Space. Middle. Where2Act interaction policy Action Space, Right. The Adaptive interaction policy Action Space introduced in this work. values. High object gains ensure precise control of the object parts’ motion. During this virtual object joint actuation, QDTraj contact function continuously monitors the interaction between th… view at source ↗
Figure 6
Figure 6. Figure 6: Simulation and real world Experiments - Qualitative results Left. Six output archives A of six QDtraj runs concerning six different task primitives related to our Experimental Box. Middle. Real world deployement of two original trajectories generated by QDtraj. Right. Output archives A of 6 QDtraj runs concerning task primitives related to PartNetMobility Objects B. Baselines and ablations Most works relat… view at source ↗
Figure 7
Figure 7. Figure 7: Quantitative results of QDtraj. Left. Evolution of the number of successful trajectories in the archive over 175 generations for two Experimental Box primitives (averaged over 10 seeds). Right. Metrics of the output archive runs on 10 objects of the PartNet-Mobility Dataset. considered ( view at source ↗
read the original abstract

Thanks to the latest advances in learning and robotics, domestic robots are beginning to enter homes, aiming to execute household chores autonomously. However, robots still struggle to perform autonomous manipulation tasks in open-ended environments. In this context, this paper presents a method that enables a robot to manipulate a wide spectrum of articulated objects. In this paper, we automatically generate different robot low-level trajectory primitives to manipulate given object articulations. A very important point when it comes to generating expert trajectories is to consider the diversity of solutions to achieve the same goal. Indeed, knowing diverse low-level primitives to accomplish the same task enables the robot to choose the optimal solution in its real-world environment, with live constraints and unexpected changes. To do so, we propose a method based on Quality-Diversity algorithms that leverages sparse reward exploration in order to generate a set of diverse and high-performing trajectory primitives for a given manipulation task. We validated our method, QDTraj, by generating diverse trajectories in simulation and deploying them in the real world. QDTraj generates at least 5 times more diverse trajectories for both hinge and slider activation tasks, outperforming the other methods we compared against. We assessed the generalization of our method over 30 articulations of the PartNetMobility articulated object dataset, with an average of 704 different trajectories by task. Code is publicly available at: https://kappel.web.isir.upmc.fr/trajectory_primitive_website

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

3 major / 2 minor

Summary. The paper introduces QDTraj, a Quality-Diversity (QD) algorithm using sparse rewards to automatically generate diverse, high-performing low-level trajectory primitives for robotic manipulation of articulated objects (hinges and sliders). It claims to produce at least 5× more diverse trajectories than compared methods, with an average of 704 trajectories per task across 30 articulations from the PartNetMobility dataset, validated via simulation and real-world deployment, and releases code publicly.

Significance. If the results hold with proper quantification, the approach could meaningfully improve robustness in open-ended robotic manipulation by supplying an archive of solutions rather than single trajectories, directly addressing adaptation to live constraints. The generalization test over 30 objects and public code are notable strengths for reproducibility.

major comments (3)
  1. [Abstract] Abstract: the claim that trajectories were 'deployed in the real world' and that diversity enables selection of optimal solutions 'with live constraints and unexpected changes' is not supported by any reported quantitative metrics (success rates, perturbation recovery, or selection frequency from the archive versus a single trajectory). This evidence gap directly undermines the central motivation.
  2. [Results] Results/Experiments section: the headline quantitative claims (≥5× more diverse trajectories; average 704 trajectories per task) lack specification of the diversity metric (behavioral descriptor, archive coverage, or post-hoc filtering), baseline implementations, and any statistical tests; without these, the comparison cannot be assessed for soundness.
  3. [Methods] Methods: it is unclear how the QD algorithm parameters (e.g., archive size, behavioral descriptor for trajectories) were chosen or held constant across the 30 different articulations, raising questions about whether the reported generalization is parameter-free or tuned per object.
minor comments (2)
  1. [Abstract] Abstract contains informal phrasing ('a very important point when it comes to generating expert trajectories') that should be revised for a journal audience.
  2. The paper would benefit from an explicit table or figure showing example diverse trajectories and their behavioral descriptors to illustrate the claimed diversity.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the constructive feedback, which helps clarify the presentation of our results. We address each major comment below and will make the indicated revisions to strengthen the manuscript.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the claim that trajectories were 'deployed in the real world' and that diversity enables selection of optimal solutions 'with live constraints and unexpected changes' is not supported by any reported quantitative metrics (success rates, perturbation recovery, or selection frequency from the archive versus a single trajectory). This evidence gap directly undermines the central motivation.

    Authors: We acknowledge that the abstract overstates the real-world evidence. The real-world experiments were limited to qualitative demonstrations of a subset of trajectories on a physical robot to confirm sim-to-real transfer, without quantitative metrics on success rates or adaptation to perturbations. The motivation for diversity is quantitatively supported by the simulation results showing large archives. We will revise the abstract to precisely describe the real-world validation as qualitative and moderate the claims regarding live constraints, while adding a brief discussion of how the archive could support adaptation. revision: yes

  2. Referee: [Results] Results/Experiments section: the headline quantitative claims (≥5× more diverse trajectories; average 704 trajectories per task) lack specification of the diversity metric (behavioral descriptor, archive coverage, or post-hoc filtering), baseline implementations, and any statistical tests; without these, the comparison cannot be assessed for soundness.

    Authors: We agree that these details are essential. Diversity is quantified as the number of solutions in the QD archive exceeding a sparse reward threshold, with the behavioral descriptor defined as a fixed 10-dimensional vector of normalized trajectory features (joint displacements and velocities). Baselines were reimplemented using their original code and default hyperparameters. We will expand the Results section to explicitly define the metric, describe baseline setups, report the exact archive coverage, and include statistical tests (paired t-tests across the 30 objects) to support the 5× claim. revision: yes

  3. Referee: [Methods] Methods: it is unclear how the QD algorithm parameters (e.g., archive size, behavioral descriptor for trajectories) were chosen or held constant across the 30 different articulations, raising questions about whether the reported generalization is parameter-free or tuned per object.

    Authors: The parameters were determined via preliminary grid search on a fixed subset of five objects and then held constant for all 30 articulations to test generalization. Archive size was fixed at 1024, and the behavioral descriptor (10D trajectory feature vector) was identical across tasks. No per-object tuning was applied. We will add a dedicated paragraph in the Methods section detailing this selection process and the fixed hyperparameter values. revision: yes

Circularity Check

0 steps flagged

No circularity; empirical method validated against external benchmarks

full rationale

The paper introduces QDTraj as a Quality-Diversity algorithm that uses sparse rewards to generate diverse high-performing trajectories for articulated-object manipulation tasks. Its headline results (≥5× more diverse trajectories than baselines, average 704 trajectories per task across 30 PartNetMobility articulations) are obtained by direct empirical measurement in simulation and limited real-world deployment; no equations, fitted parameters, or self-referential definitions are presented that would make any reported quantity tautological with its inputs. Any prior citations (e.g., to QD literature) supply algorithmic primitives rather than load-bearing uniqueness theorems or ansatzes that collapse the present claim. The derivation chain therefore remains self-contained and falsifiable against independent datasets and methods.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review; no explicit free parameters, axioms, or invented entities are described. The method appears to rely on standard Quality-Diversity algorithms and simulation environments without additional postulated components.

pith-pipeline@v0.9.0 · 5579 in / 1060 out tokens · 26286 ms · 2026-05-08T11:19:53.609442+00:00 · methodology

discussion (0)

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