LLM-ACES: Closed-Loop Discovery of Dynamical Systems with LLM-Guided Adaptive Search
Pith reviewed 2026-06-25 23:33 UTC · model grok-4.3
The pith
LLM-ACES recovers governing ODEs by letting an LLM partition the search space and using model disagreement to select new trajectories in a closed loop.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
LLM-ACES jointly optimizes symbolic hypothesis construction and adaptive data acquisition: the LLM proposes operator priors that partition the large search space into distinct regions; candidate equations are fit to the observed data inside each region; disagreement among these candidates guides the acquisition of informative new trajectories; the process repeats, refining both the hypothesis space and the recovered dynamics.
What carries the argument
LLM-proposed operator priors that partition the search space, combined with disagreement among fitted candidates to select the next trajectories in a feedback loop.
If this is right
- The closed loop yields the lowest median NMSE across the 122 systems while reaching 46.2 percent and 52.4 percent symbolic accuracy on the two benchmark collections.
- Performance stays superior when only one-tenth the usual data volume is supplied.
- Under added noise the method recovers the true symbolic structure instead of introducing spurious terms that fit locally.
Where Pith is reading between the lines
- The same disagreement signal could be used to decide when to stop collecting data rather than running a fixed budget.
- The operator-prior partitioning step may transfer to discovering other classes of governing equations such as delay differential equations or stochastic differential equations.
- Because the loop explicitly targets identifiability gaps, it could be paired with experimental design methods that already optimize for parameter uncertainty.
Load-bearing premise
LLM-proposed operator priors meaningfully partition the search space and disagreement among fitted candidates reliably identifies the most informative next trajectories.
What would settle it
On the same 122 ODE systems and identical data budgets, replace the LLM-guided acquisition step with random or fixed sampling and measure whether median NMSE and symbolic accuracy remain within one order of magnitude of the reported LLM-ACES results.
Figures
read the original abstract
Recovering governing Ordinary Differential Equations (ODEs) from data is a central challenge in modeling dynamical systems across scientific domains. Existing approaches cast discovery as a static inference problem over fixed datasets, assuming that the observed trajectories are sufficiently informative. However, dynamical systems evolve over large state spaces, and limited data can make multiple equations observationally indistinguishable, leading to identifiability gaps and the recovery of incorrect governing equations. To address this, we introduce LLM-ACES, or LLM-guided Active Closed-loop Equation Search, a closed-loop framework that jointly optimizes symbolic hypothesis construction and adaptive data acquisition. In LLM-ACES, a large language model (LLM) proposes operator priors that partition the large search space into distinct regions, within which candidate equations are fit to the observed data. The disagreement among these candidates guides the acquisition of informative trajectories, creating a feedback loop that iteratively refines both the hypothesis space and the discovered dynamics. On 122 ODE systems spanning ODEBench and ODEBase, LLM-ACES achieves the lowest median NMSE, outperforming state-of-the-art baselines by several orders of magnitude while achieving a high symbolic accuracy of 46.2% and 52.4%, respectively. Our analysis further shows that LLM-ACES is sample-efficient, achieving better performance with one-tenth the data. Furthermore, LLM-ACES's feedback-driven data acquisition makes it robust to noise and recovers the correct symbolic structure, while baselines introduce spurious terms that fit the data locally but obscure the true governing relationships.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript introduces LLM-ACES, a closed-loop framework for ODE discovery that uses an LLM to propose operator priors partitioning the search space, fits candidate equations within regions, and employs candidate disagreement to drive adaptive trajectory acquisition. On 122 systems from ODEBench and ODEBase it reports the lowest median NMSE (outperforming baselines by several orders of magnitude), symbolic accuracies of 46.2% and 52.4%, improved sample efficiency with one-tenth the data, and greater robustness to noise than baselines.
Significance. If the performance gains prove reproducible and the closed-loop mechanism is shown to be responsible rather than implementation differences, the work would offer a notable advance by demonstrating how LLM-generated priors combined with disagreement-driven active sampling can mitigate identifiability gaps in dynamical-system discovery. The emphasis on sample efficiency and noise robustness addresses practical constraints in experimental settings.
major comments (2)
- [Abstract] Abstract: the central empirical claim of orders-of-magnitude lower median NMSE and 46–52% symbolic accuracy on 122 systems is presented without any description of the experimental protocol, baseline implementations, statistical tests, data-generation details, or selection criteria for the 122 systems, rendering the quantitative results unverifiable.
- [Abstract] Abstract: the mechanism that LLM-proposed operator priors create distinct regions and that candidate disagreement reliably selects informative trajectories is asserted as the source of the performance gap, yet no ablation is described that holds the acquisition strategy fixed while removing the LLM prior step, nor any quantitative correlation between disagreement and reduction in posterior entropy.
Simulated Author's Rebuttal
We thank the referee for the constructive feedback. We address each major comment below and will revise the manuscript to improve clarity and provide additional supporting analyses.
read point-by-point responses
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Referee: [Abstract] Abstract: the central empirical claim of orders-of-magnitude lower median NMSE and 46–52% symbolic accuracy on 122 systems is presented without any description of the experimental protocol, baseline implementations, statistical tests, data-generation details, or selection criteria for the 122 systems, rendering the quantitative results unverifiable.
Authors: We agree that the abstract's brevity omits these details. The full manuscript describes the experimental protocol, baseline implementations, statistical tests, data-generation process, and selection criteria for the 122 systems in Sections 4.1, 4.2, and 5. We will revise the abstract to include a concise summary of the experimental setup and direct readers to the relevant sections, thereby improving verifiability while respecting length limits. revision: yes
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Referee: [Abstract] Abstract: the mechanism that LLM-proposed operator priors create distinct regions and that candidate disagreement reliably selects informative trajectories is asserted as the source of the performance gap, yet no ablation is described that holds the acquisition strategy fixed while removing the LLM prior step, nor any quantitative correlation between disagreement and reduction in posterior entropy.
Authors: Section 6 of the manuscript includes ablations examining the LLM priors and disagreement-driven acquisition. However, we acknowledge that a targeted ablation holding the acquisition strategy fixed while removing only the LLM prior step is not explicitly presented, nor is a direct quantitative correlation between disagreement and posterior entropy reduction. We will add this specific ablation and the requested correlation analysis (including a new figure) in the revised manuscript to better substantiate the claimed mechanism. revision: yes
Circularity Check
No circularity: empirical framework evaluated on external benchmarks
full rationale
The paper describes LLM-ACES as a procedural framework that uses an LLM to propose operator priors, fits candidate equations within partitioned regions, and employs candidate disagreement to drive adaptive trajectory acquisition. All reported results consist of comparative performance metrics (median NMSE, symbolic accuracy) measured on the fixed external benchmark collections ODEBench and ODEBase across 122 systems. No equation, theorem, or performance claim is shown to reduce by construction to a quantity defined inside the method itself; the evaluation remains independent of the fitted parameters or LLM proposals. Any self-citations that may exist are peripheral and do not carry the central empirical claims.
Axiom & Free-Parameter Ledger
axioms (1)
- domain assumption LLM-generated operator priors can usefully partition the space of possible ODEs
invented entities (1)
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LLM-ACES framework
no independent evidence
Reference graph
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