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arxiv: 2605.29894 · v1 · pith:UKTY3FLOnew · submitted 2026-05-28 · 💻 cs.CV

Train the Agent, Not the Expert: Learning to Harness Heterogeneous Experts for Multi-Turn Visual Reasoning

Yaowu Fan , Tao Han , Dazhao Du , Andy J. Ma , Jia Wan This is my paper

Pith reviewed 2026-06-29 08:32 UTC · model grok-4.3

classification 💻 cs.CV
keywords visual agentexpert harnessingmulti-turn reasoningvisual reasoning segmentationreferring expressionobject detectionreinforcement learningdynamic memory
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The pith

VisHarness trains a lightweight agent to select and sequence calls to fixed heterogeneous visual experts across multi-turn interactions rather than training any single expert for the full task.

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

The paper introduces VisHarness as a trainable visual agent that separates high-level decision making from low-level execution by learning a policy to call and combine existing specialized models. This policy is trained with only lightweight reinforcement learning while the experts remain frozen. The approach is tested on benchmarks involving reasoning segmentation, referring segmentation, small-object detection, and counting, where it exceeds general models and matches or beats task-specific ones. A dynamic memory mechanism is added to keep token costs manageable during multi-turn expert interactions. The central claim is that a general harnessing policy can deliver both broad applicability and expert-level precision without per-task retraining of the underlying models.

Core claim

VisHarness learns a generalizable policy that, through multi-turn interactions, chooses which heterogeneous visual experts to invoke and in what order, solving complex visual tasks while preserving the experts' specialized precision and avoiding the need to fine-tune them for each new condition.

What carries the argument

VisHarness, the trainable agent whose policy decides when and which experts to call, supported by dynamic visual memory archiving to control token growth in live multi-turn loops.

If this is right

  • The same agent policy can be applied to new visual tasks by adding or swapping experts without retraining the policy from scratch.
  • Multi-turn expert interaction becomes feasible at scale once memory archiving keeps token counts bounded.
  • General-purpose models can be improved by wrapping them with a learned harness rather than scaling the base model further.
  • Task-specific models retain their accuracy edge while gaining the flexibility of a shared decision layer.

Where Pith is reading between the lines

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

  • If the policy generalizes across expert sets, the same training loop could be reused for entirely different modalities such as audio or 3-D data.
  • The memory archiving trick may also apply to other agent systems that accumulate large context from tool calls.
  • Performance gains would shrink if the experts themselves become outdated faster than the policy can be retrained.

Load-bearing premise

A single lightweight-trained policy can reliably choose and order calls to a fixed set of experts for many different complex visual conditions without any further expert retraining.

What would settle it

On a new benchmark mixing the four task types, the agent would need to produce lower accuracy than both general models and the best task-specific model in at least two categories when experts are held completely fixed.

Figures

Figures reproduced from arXiv: 2605.29894 by Andy J. Ma, Dazhao Du, Jia Wan, Tao Han, Yaowu Fan.

Figure 1
Figure 1. Figure 1: From expert training to expert harnessing. (a): Traditional computer vision methods train a separate specialist for each visual sub-task. (b): VisHarness learns one harnessing policy over a set of heterogeneous experts and thus can solve complex visual tasks through multi-turn interaction. to solve the entire problem (see [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Overview of VisHarness. VisHarness solves complex fundamental vision tasks through multi-turn interactions. At each turn, it selects an action based on the current memory. When a visual expert is invoked, the environment parses the expert name and arguments, and a controller dispatches the request to the least-loaded worker among multiple expert instances for parallel execution. After receiving the visuali… view at source ↗
Figure 3
Figure 3. Figure 3: The Heterogeneous Visual Expert Suite consists of six visual experts, including three [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Distribution of visual expert calling by different model variants across different datasets. [PITH_FULL_IMAGE:figures/full_fig_p009_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Multi-turn interaction visualization on two representative image-text pairs. [PITH_FULL_IMAGE:figures/full_fig_p009_5.png] view at source ↗
read the original abstract

Recent progress in computer vision has produced a wide range of powerful specialized models for detection, segmentation, counting, and other visual tasks. However, these models are usually optimized for isolated task formulations, making it difficult to directly support general-purpose visual intelligence, especially when a task requires complex language understanding and dense small-object perception. In this paper, we propose VisHarness, a trainable visual agent that decouples high-level perception, reasoning, and decision-making from low-level task execution. Instead of training a model to solve a specific visual task, VisHarness learns to harness a set of carefully designed heterogeneous visual experts. This paradigm preserves the general intelligence of the agent while fully leveraging the precision advantages of specialized visual models in concrete visual tasks. With only lightweight training, VisHarness learns a generalizable visual expert-harnessing policy and can solve common fundamental vision tasks under various complex conditions through multi-turn interactions with visual expert models. To enable efficient on-policy reinforcement learning training in a live environment, we introduce dynamic visual memory archiving, which mitigates the rapidly accumulating visual-token overhead caused by multi-turn interactions with visual expert models. Experiments on four representative benchmarks covering reasoning segmentation, generalized referring segmentation, dense small-object detection, and referring counting demonstrate that VisHarness substantially outperforms existing general-purpose models and achieves competitive or superior performance compared with task-specific models.

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 proposes VisHarness, a trainable visual agent that decouples high-level perception, reasoning, and decision-making from low-level task execution by learning a generalizable policy to harness a set of fixed heterogeneous visual experts via multi-turn interactions. It introduces dynamic visual memory archiving to support efficient on-policy reinforcement learning by mitigating visual-token overhead. The central empirical claim is that, with only lightweight training, VisHarness substantially outperforms existing general-purpose models and achieves competitive or superior performance to task-specific models on four benchmarks covering reasoning segmentation, generalized referring segmentation, dense small-object detection, and referring counting.

Significance. If the performance claims hold under rigorous validation, the paradigm of training a lightweight general policy for expert selection and sequencing (rather than fine-tuning the experts themselves) offers a promising route toward general-purpose visual intelligence that combines flexible reasoning with the precision of specialized models. The approach is internally consistent with the described architecture and addresses a genuine limitation of task-specific optimization.

major comments (1)
  1. [Abstract and Experiments] Abstract and Experiments section: The benchmark results are stated without details on the specific baselines compared, error bars or statistical significance, data splits, or exact training procedures (including reward formulation and on-policy RL hyperparameters), which is load-bearing for assessing whether VisHarness truly outperforms general-purpose models or matches task-specific ones.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the constructive feedback highlighting the need for greater experimental transparency. We agree that the current presentation of results in the abstract and experiments section lacks sufficient detail on baselines, statistical measures, data handling, and training specifics, which is essential for validating the performance claims. We will revise the manuscript to address this.

read point-by-point responses

  1. Referee: The benchmark results are stated without details on the specific baselines compared, error bars or statistical significance, data splits, or exact training procedures (including reward formulation and on-policy RL hyperparameters), which is load-bearing for assessing whether VisHarness truly outperforms general-purpose models or matches task-specific ones.

    Authors: We fully agree with this assessment. The revised manuscript will expand the Experiments section (and update the abstract if space permits) to explicitly list all compared baselines with citations and categories (general-purpose vs. task-specific), report error bars from multiple random seeds along with statistical significance tests (e.g., paired t-tests or Wilcoxon tests with p-values), detail the exact train/validation/test splits used for each of the four benchmarks, and provide complete training details including the reward function formulation, on-policy RL algorithm hyperparameters (learning rate, discount factor, batch size, rollout length, number of epochs), and any other procedural specifics. These additions will enable rigorous independent verification of the reported gains. revision: yes

Circularity Check

0 steps flagged

No significant circularity

full rationale

The paper proposes VisHarness as an agent policy trained via lightweight on-policy RL to select and sequence calls to fixed heterogeneous experts, with dynamic memory to handle multi-turn interactions. No derivation chain reduces a claimed result to its inputs by construction: the central claim is an empirical performance advantage on four external benchmarks (reasoning segmentation, generalized referring segmentation, dense small-object detection, referring counting), which are standard and independent of the training objective or fitted parameters. No self-definitional equations, fitted-input predictions, or load-bearing self-citations are present in the provided text; the architecture is described as decoupled and the evaluation uses external task-specific models for comparison without internal reduction.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 2 invented entities

The central claim rests on the domain assumption that fixed expert models can be effectively orchestrated by a learned policy and on the new technique of dynamic visual memory archiving; no explicit free parameters or invented physical entities are stated.

axioms (1)
  • domain assumption Heterogeneous visual experts remain effective when called in sequence by an external policy without modification.
    Invoked to justify decoupling agent training from expert optimization.
invented entities (2)
  • VisHarness no independent evidence
    purpose: Trainable agent for expert harnessing
    New system name and architecture introduced to implement the policy.
  • dynamic visual memory archiving no independent evidence
    purpose: Reduce visual token overhead during multi-turn RL
    New mechanism proposed to enable efficient on-policy training.

pith-pipeline@v0.9.1-grok · 5782 in / 1251 out tokens · 33718 ms · 2026-06-29T08:32:53.443452+00:00 · methodology

discussion (0)

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Reference graph

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