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REVIEW 5 major objections 5 minor 65 references

Efficient Grand Canonical Global Optimization with On-the-fly-trained Machine-learning Interatomic Potentials

T0 review · 5 major / 5 minor · reviewed 2026-08-04 · deepseek-v4-flash

Pith's one-line read The paper's central claim is that a single grand-canonical search—varying geometry and composition together under a Gibbs-energy acquisition function—finds stable structures and chemical states with fewer first-principles evaluations than i

desk verdict A real algorithmic step for grand-canonical search with on-the-fly MLIPs, but the efficiency claim is undercut by a lax success criterion and an uncontrolled baseline. read the letter →

arxiv 2509.19968 v2 pith:QJ5YW5OL submitted 2025-09-24 cond-mat.mtrl-sci physics.chem-ph

classification cond-mat.mtrl-sciphysics.chem-ph
keywords grandcanonicalglobaloptimizationmachine-learninginteratomicpotentialsGaussianprocessregressionSOAPdescriptorabinitiothermodynamicsevolutionaryalgorithmscatalyststructurepredictionsurfaceoxidereconstructions
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

The paper implements and tests a global optimization algorithm that changes both atomic geometry and chemical composition in one run, ranking candidates by their Gibbs energy of formation at a chosen temperature and pressure rather than by raw potential energy. To keep the search affordable, it trains a machine-learning interatomic potential on the fly using sparse Gaussian process regression over local atomic environments, so expensive first-principles calculations are reserved for a small number of promising candidates. The authors show on three test systems—free Ir3Ox clusters, Pt3Ox clusters on ceria, and the Pd(100) surface—that the algorithm reproduces known stable phases and, in some cases, finds structures more stable than those from previous single-stoichiometry searches, while using fewer total first-principles evaluations than the canonical approach. The result matters because computational models of catalysts need structures that are representative of the actual reaction conditions, and enumerating every possible stoichiometry is often the main bottleneck.

What carries the argument

The load-bearing machinery is the combination of a size-extensive surrogate potential and an ab initio thermodynamics acquisition function. The surrogate is a sparse Gaussian process regression model using the smooth overlap of atomic positions (SOAP) descriptor to represent each atom's local environment; total energy is the sum of per-atom contributions, so the model can be applied to structures with any number of atoms. The acquisition function F = ΔG_model − κ σ ranks candidates by their predicted Gibbs energy of formation (computed from the surrogate plus the chemical potentials of reservoirs) with a penalty proportional to the prediction uncertainty, so the search is steered toward comp

What would settle it

Take a set of held-out geometries across several stoichiometries of an ionic system (e.g., a small metal-oxide cluster with known charge transfer), ask the surrogate to predict their relative energies, and compare with first-principles single-point energies; if the per-stoichiometry error in relative energy is comparable to the gaps that determine the phase diagram, the acquisition function will mis-rank candidates and the claimed efficiency gain loses meaning.

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Extended reading notes

Core claim

The central claim is that the most stable structure and chemical state of a system under specified reaction conditions can be found by a single grand-canonical global optimization, and that this is more efficient than running a canonical global-minimum search for every stoichiometry separately. Efficiency comes from an on-the-fly trained, size-extensive surrogate potential built from sparse Gaussian process regression and SOAP descriptors: total energy is the sum of per-atom contributions, so the same model ranks structures with different numbers of atoms. Candidates are selected by an acquisition function that combines the surrogate's predicted Gibbs energy of formation with an uncertainty

Load-bearing premise

The search relies on the surrogate potential's ability to rank structures across different compositions, which assumes a structure's total energy is a sum of contributions from local atomic environments; if long-range charge or electrostatics breaks that locality, the Gibbs-energy ordering of candidates can be wrong.

Editorial extensions

If this is right

  • A single GCGO run can identify the most stable structure and composition at a target chemical potential, removing the need for separate global searches for every stoichiometry.
  • The search allocates first-principles evaluations primarily to stoichiometries that are competitive at the target conditions, avoiding wasteful sampling of very unstable compositions.
  • One run can produce global minima for several stoichiometries; in the Pt3Ox/CeO2 test, the algorithm found structures 0.70 eV and 0.56 eV more stable than previously reported minima for Pt3O6 and Pt3O4.
  • The success rate is highest when a single stoichiometry is clearly most stable; near phase boundaries, where several stoichiometries are close in Gibbs energy, the search can get stuck on smaller, easier-to-optimize compositions.
  • The algorithm applies to both cluster systems and extended surface reconstructions, so it can be used to model catalysts under reactive environments more generally.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • A fairer efficiency comparison would give the canonical approach the same total first-principles budget and measure the quality of the best structure found; the paper's conclusions are based on a comparison with previously published canonical runs that used different stopping criteria.
  • The cross-stoichiometry transferability of the local SOAP+GPR surrogate is the key fragility; systems with strong charge transfer or long-range electrostatics could violate the locality assumption, so stress-testing on ionic oxides would be a prudent validation.
  • The Gibbs-energy acquisition function neglects vibrational and entropic contributions; including them would extend the method to finite-temperature phase stability without changing the overall search framework.
  • The active-learning loop could accommodate more expressive surrogate architectures—for example, equivariant message-passing networks—which might improve cross-composition accuracy while keeping the on-the-fly training and uncertainty ranking.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

5 major / 5 minor

Summary. The manuscript implements a grand canonical global optimization (GCGO) algorithm in the AGOX framework. The algorithm combines GOFEE-style on-the-fly training of a sparse Gaussian Process Regression (GPR) model with SOAP descriptors, and uses a Gibbs-energy-of-formation acquisition function to compare candidates across stoichiometries. The search is demonstrated on Ir3Ox clusters (using a MACE MLIP as the target level of theory in the statistical benchmark), Pt3Ox clusters supported on CeO2(111) (using DFT as the target), and Pd(100) surface oxides (using DFT). The central claim is that GCGO finds stable structures and chemical states under given reaction conditions more efficiently than canonical approaches that optimize each stoichiometry independently.

Significance. If the efficiency claim were fully supported, the paper would be a useful contribution: it addresses a real bottleneck in computational catalysis, the code is released as part of an open-source package, the Pd(100) test reproduces known surface-oxide phases, and the algorithm demonstrably explores multiple stoichiometries in a single run. However, the evidence for the headline claim is weakened by the success metric used in the Ir3Ox benchmark, which ignores stoichiometry, and by the uncontrolled comparison with the GOFEE baseline for Pt3Ox. The paper is therefore best viewed as a promising algorithmic demonstration whose quantitative performance claims need substantial revision.

major comments (5)
  1. [Section III A, Fig. 3b] The success criterion is defined as finding a candidate with ΔGf within 0.5 eV of the true global minimum, and the text explicitly states that this ignores whether the candidate has the same stoichiometry as the true minimum. The paper itself notes that requiring the correct stoichiometry at λ2 (ΔμO = -1.15 eV) drops the success rate to roughly 10%. Because the method's purpose is to identify both stable structure and chemical state, a metric that rewards the wrong composition cannot support the Conclusion's claim of finding 'stable configurations and compositions'. The bias toward smaller, simpler stoichiometries is also attributed to the search operators themselves, so the benchmark does not demonstrate efficiency for the near-degenerate cases that motivate a grand canonical method.
  2. [Section III B, Section II B 2] The comparison with the canonical GOFEE approach is uncontrolled. The GOFEE baseline used 800 single-point evaluations per stoichiometry, while each GCGO run used about 3000 total. Moreover, GCGO found structures that are 0.56–0.70 eV more stable than the previously reported GOFEE minima, which indicates that the baseline had not converged. A fair head-to-head requires matched evaluation budgets, an identical success criterion that includes stoichiometry, and ideally the same target level of theory for both algorithms. As written, the data do not establish that GCGO is more efficient than canonical approaches.
  3. [Section II B 1 and Section III A] The main statistical benchmark for Ir3Ox uses a MACE machine-learning potential as the 'target level of theory' rather than first-principles DFT. This setup tests the search algorithm on a cheap MLIP target, but it does not measure the number of DFT evaluations saved, which is the central efficiency claim of the paper. The large number of runs made possible by using MACE is acknowledged, but the conclusions are stated in terms of reducing first-principles calculations. Results obtained with a MACE target should be presented as a search-behavior study, not as a benchmark of DFT-evaluation efficiency.
  4. [Section II A and Fig. 2] The size-extensive local surrogate is essential for ranking candidates across different stoichiometries, yet its cross-stoichiometry accuracy is never quantified. The parity plots in Fig. 2 pool all compositions and all steps into a single plot, so the reader cannot see whether errors are concentrated in rarely sampled stoichiometries. Since a wrong relative Gibbs-energy ranking between stoichiometries directly misdirects the acquisition function, the manuscript should report per-stoichiometry error metrics (e.g., MAE/RMSE as a function of x) and, ideally, the error in predicted ΔGf at the target chemical potentials.
  5. [Section III A] The 'true' global minima used to score success in the Ir3Ox benchmark are the best structures found by the GCGO runs themselves plus additional single-stoichiometry GCGO executions. This is partially self-referential: the success rates are relative to structures discovered by the same algorithm, so they could be inflated if a lower-energy structure was never sampled. An independent reference for at least some of these small clusters (e.g., exhaustive sampling or literature global minima) would strengthen the validation.
minor comments (5)
  1. [Abstract and author list] Typos: 'nanostructued', 'Theab initio', and the author name 'Bjrk' should be 'Bjørk'.
  2. [Section II B 3] The text says '15 searches at each of five different chemical potentials ... adding up to a total of 45 GCGO runs.' Fifteen times five is 75, not 45. Please correct the count or the per-potential number of runs.
  3. [Section II B 2 vs III B] The allowed stoichiometry range for Pt3Ox is given as x ∈ {1,...,6} in the methods section but as x ∈ {0,...,6} in the results. Please make this consistent.
  4. [Section III B, Fig. 6 text] The text refers to 'Pt6O5 and Pt6O4' after describing a Pt3Ox run; these should presumably be Pt3O5 and Pt3O4. Also, 'GOGC' appears in one place instead of 'GCGO'.
  5. [Fig. 3 caption] The caption says 'shown as dotted vertical lines if Fig. 3a' — 'if' should be 'in'.

Circularity Check

2 steps flagged · score 6.0 of 10

Partial circularity: Ir3Ox 'true' minima are the algorithm's own outputs and Pt3Ox reference minima come from the authors' own unconverged GOFEE work; Pd(100) comparison is external and independent.

  1. self definitional [Section III A (Performance analysis for free-standing Ir3Ox particles), phase diagram description and Fig. 3]
    "The global minima correspond to the best structures found for each stoichiometry along the 75 GCGO executions as well as in additional single-stoichiometry executions of the GCGO algorithm carried out as consistency tests."

    The success criterion defines the 'true' global minima as the best candidates produced by the same GCGO algorithm being tested. Cumulative success is therefore the rate at which a run rediscovers the algorithm's own best output, not the rate at which an independently known ground truth is found. This is a self-referential benchmark: the target of the search is constructed from the search's own results. The paper's own caveat that imposing the correct stoichiometry lowers the lambda2 success rate to ~10% shows that the 0.5 eV DeltaGf-only metric can count a run successful even when the identified composition is wrong, which is the central claimed capability.

  2. self citation load bearing [Section III B (Performance analysis for Pt3Ox particles on CeO2(111)), Fig. 5b and preceding text]
    "we reproduce the results obtained in a previous work employing the GOFEE method for the catalytically relevant Pt3Ox/CeO2(111) system ... As a measure of the GCGO success rate, Fig. 5b shows the number of executions, as a function of target Delta-mu_O and stoichiometry, where a structure 0.1 eV less stable or better than the GOFEE candidate to the global minimum was found."

    The reference 'global minimum' for the Pt3Ox benchmark is the GOFEE candidate from Ref 15, a paper authored by two of the current authors. The success metric is explicitly 'better than the GOFEE candidate', not comparison to an externally established minimum. The paper itself reports that GCGO found structures 0.70 eV and 0.56 eV more stable than those Ref 15 minima for Pt3O6 and Pt3O4, showing the prior self-citation baseline was not converged. Hence the claimed 'higher efficiency than Canonical approaches' for this system is measured against the authors' own earlier, demonstrably incomplete search, making the comparison self-referential rather than a test against the true global minimum.

full rationale

The core algorithm is not circular: the GCGO acquisition function (Eq. 3), the SOAP+GPR local surrogate, and the addition/removal composition operators are defined independently of the benchmark results, and the Pd(100) comparison to Rogal et al. is external and gives independent support. However, the two cluster benchmarks that carry the main efficiency claim are partially self-referential. For Ir3Ox, the 'true' global minima used to score success are the best candidates found by the same GCGO algorithm, so the success rate measures self-consistency rather than independent identification; the paper explicitly acknowledges that success rates use only a DeltaGf criterion and that requiring the correct stoichiometry drops the lambda2 success rate to ~10%, undermining the claim that GCGO finds both structure and composition. For Pt3Ox, the reference minima come from the authors' own previous GOFEE work, and the paper shows these were not converged (GCGO finds 0.56-0.70 eV lower structures), so the comparison to canonical GOFEE is not a fair or independent benchmark. Additional correctness risks, such as unquantified cross-stoichiometry MLIP accuracy and the uncontrolled evaluation budgets in the Pt3Ox comparison, are noted but are not themselves circularity. Overall, the validation is partly circular, but the external Pd(100) result and the independent implementation details prevent the circularity from being total.

Assumptions & free parameters 4 free parameters · 3 assumptions · 0 invented entities

The algorithm does not introduce new physical entities. The central claim depends on the local-energy decomposition ansatz, the standard vibrational-free Gibbs approximation, and the quality of the reference models (MACE for Ir3Ox, DFT for the others), plus a set of user-chosen hyperparameters (kappa, SOAP settings, inducing point cap, success thresholds) that are not tuned or ablated.

free parameters (4)
  • kappa (uncertainty weight) = 2
    User-defined weight in the acquisition function F = dG_M - kappa*sigma; no sensitivity analysis is provided.
  • SOAP descriptor parameters = R_cut=5 (presumably Angstrom), n_max=3, l_max=2, sigma=1
    Chosen by hand for all runs; no systematic tuning or justification is given in the paper.
  • CUR inducing points cap = 1000
    Arbitrary cap on the sparse GPR inducing points; stated as a run parameter without justification.
  • Success thresholds = 0.5 eV (Ir3Ox), 0.1 eV (Pt3Ox)
    Evaluation thresholds chosen by hand to define success; the 0.5 eV threshold is loose and directly affects reported success rates.
assumptions (3)
  • domain assumption Gibbs energy can be approximated by potential energies, neglecting vibrational and entropic contributions (Eq. 2).
    Standard ab initio thermodynamics approximation invoked in Section II A; it assumes vibrational contributions cancel or are negligible, which is questionable for small clusters.
  • domain assumption Total energies decompose into a sum of atomic environment contributions (SOAP/GAP local model), making the surrogate size-extensive across stoichiometries.
    Invoked in Section II A to justify using one model across compositions; fails if long-range or charge-transfer effects dominate, as in ionic oxide clusters.
  • domain assumption The MACE MLIP accurately represents the DFT reference for Ir3Ox.
    Used as the target level of theory in the statistical benchmark in Section II B 1; errors in MACE become ground-truth errors for success-rate measurement.

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Cite this review

Pith. "Pith review of Efficient Grand Canonical Global Optimization with On-the-fly-trained Machine-learning Interatomic Potentials." pith.science (2026). https://pith.science/paper/QJ5YW5OL

@misc{pith2026250919968,
  author       = {Pith},
  title        = {Pith review of: Efficient Grand Canonical Global Optimization with On-the-fly-trained Machine-learning Interatomic Potentials},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/QJ5YW5OL}},
  note         = {Machine review of arXiv:2509.19968}
}
read the original abstract

The characterization of nanostructured materials under reactive environments is challenging due to the complexity of the structural motifs involved and their chemical transformations. Global optimization approaches allow predicting stable structures for targeted materials but addressing the configurational and compositional search spaces is both computationally demanding and inefficient, especially when first principles calculations are required. In this work, we implement and evaluate a computationally efficient grand canonical global optimization algorithm able to identify stable structures and chemical states of targeted systems under given reaction conditions (e.g. reactant pressure and temperature). The algorithm leverages an on-the-fly trained machine-learning interatomic potential based on sparse Gaussian Process Regression and the smooth overlap of atomic positions descriptor to reduce the number of first principles energy evaluations carried out during global optimization searches. The \textit{ab initio} thermodynamics framework is incorporated to approximate the Gibbs energy of evaluated candidates, performing environment-aware optimizations over multiple stoichiometries. We demonstrate the computational performance of this approach and its ability to reproduce some literature examples.

Figures

Figures reproduced from arXiv: 2509.19968 by the authors.

Figure 1
Figure 1. FIG. 1. Execution diagram of the grand canonical global op [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. In order to evaluate the performance with statis [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figures from the paper (4 more)
Figure 4
Figure 4. Figure 4: FIG. 4 [PITH_FULL_IMAGE:figures/full_fig_p007_4.png]
Figure 5
Figure 5. Figure 5: FIG. 5 [PITH_FULL_IMAGE:figures/full_fig_p008_5.png]
Figure 6
Figure 6. Figure 6: FIG. 6 [PITH_FULL_IMAGE:figures/full_fig_p009_6.png]
Figure 7
Figure 7. Figure 7: FIG. 7 [PITH_FULL_IMAGE:figures/full_fig_p010_7.png]

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Pith tools

Reviewed August 4, 2026 · model on record in the stance chip above.