REVIEW 3 major objections 5 minor 37 references
Investigating the (De)Composition Capabilities of Large Language Models in Natural-to-Formal Language Conversion
T0 review · 3 major / 5 minor · reviewed 2026-08-10 · deepseek-v4-flash
Pith's one-line read Large language models are deficient in both decomposition and composition when converting natural language to a formal language, and the decomposition deficiency is consistently larger across all five models tested.
desk verdict Genuinely new N2F evaluation framework and a plausible empirical finding, but the headline decomposition metric rests on an unvalidated matching assumption. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The DEDC framework carries the argument. It semi-automatically builds 323 samples over a fixed formal language of 10 tabular-reasoning primitives; each sample is a directed acyclic graph of expressions plus a natural-language question. For each test sample it selects three demonstration samples that cover the primitives, then measures an LLM in two conditions: $P_{dc}$, with only demonstrations, and $P_c$, with demonstrations plus a simplest worked example for each primitive. The difference defines decomposition deficiency $D_d = P_c - P_{dc}$ and composition deficiency $D_c = 100 - P_c$, making the two capabilities comparable on the same scale. Additional settings (0% vs 100% compositional gap, anomalous vs cross-mapped names) are scored by the same protocol to yield delta measures for each ability.
What would settle it
A model evaluated on the DEDC benchmark that produces $P_{dc} \geq P_c$ — that is, $D_d \leq 0$ — would refute the claim that decomposition deficiencies are consistently larger than composition deficiencies.
Extended reading notes
Core claim
The paper's core discovery is that LLMs' weakness in natural-to-formal conversion is concentrated in decomposition rather than composition. In the base evaluation, every one of the five models showed $D_d > D_c$: Claude-3.5 had $D_d = 7.74$ vs $D_c = 1.24$, GPT-4o had $D_d = 13.31$ vs $D_c = 5.26$, and the open-weight models ranged from $D_d = 15.79$ to $19.20$. The paper also finds that compositional gaps between demonstration samples and the test question degrade both abilities, and that counter-intuitive symbolic names impose an even larger penalty, adding more than 20 points to decomposition error for every model. Error analysis shows six recurring error types, with primitive confusion most frequent, pointing to deficiencies in both natural language understanding and in learning and using a symbolic system.
Load-bearing premise
The headline numbers assume that seeing a simplest sample of each primitive fully removes the need for decomposition, leaving the entire gap between the two conditions ($P_c - P_{dc}$) to measure decomposition alone, with no interaction between decomposition and composition.
Editorial extensions
If this is right
- Eliminating the decomposition deficiency alone would raise accuracy by 7.7 to 19.2 percentage points depending on the model, making decomposition the highest-leverage target for improvement.
- Demonstration selection matters: replacing demonstrations so that every test sample has zero compositional gap with them improves both $P_{dc}$ and $P_c$ for all five models, so graph-matching demonstration samplers are a concrete fix.
- Counter-intuitive symbolic names are a severe robustness threat; any deployment that renames primitives without retraining should expect decomposition error to rise by more than 20 points for every model.
- The DEDC framework is reusable: for any N2F task with a defined primitive set and question templates, the same two-condition protocol yields directly comparable $D_d$ and $D_c$ scores.
- Primitive confusion, the most common error, indicates that symbolic-system learning should be a focal point alongside natural-language understanding in future N2F work.
Reading between the lines
- Editorial inference: the paper's decoupling assumes additive, non-interacting capabilities; a direct test is to present the primitive demonstrations without the three full demonstration samples, which, if $P_c$ drops, would show $D_d$ overstates the decomposition-only burden.
- Editorial inference: the benchmark uses one template-generated formal language, so the finding that decomposition dominates composition may not transfer to messier real-world formalisms like SQL; replicating DEDC across other N2F tasks would reveal whether the bottleneck is general.
- Editorial inference: because evaluation is at temperature zero, the error-type distribution may be a property of greedy decoding; sampling could shift the balance between primitive confusion and omission, which the paper does not explore.
- Editorial inference: the authors' next-token-probability hypothesis for counter-intuitive names suggests a concrete intervention—explicit name-to-meaning mapping prompts or lightweight fine-tuning should shrink the more-than-20-point decomposition penalty, which the paper leaves untested.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper proposes DEDC, a semi-automatic framework for constructing samples and tasks that aim to evaluate LLMs' decomposition and composition capabilities in natural-to-formal-language (N2F) conversion under in-context learning. Using a simple tabular-reasoning formal language with ten primitives, the framework creates 323 test samples from six base graphs, and for each test sample builds a task in which the model sees either three full demonstration samples (Pdc condition) or one simplest sample per primitive used in the test sample (Pc condition). The authors define composition deficiency as Dc = 100 - Pc and decomposition deficiency as Dd = Pc - Pdc. They evaluate five LLMs and report that all of them are deficient in both capabilities, that decomposition deficiency is systematically larger than composition deficiency, and that compositional gaps and counter-intuitive symbolic names degrade both capabilities. The paper also provides an error-type taxonomy and a detailed analysis of error distributions across the five models.
Significance. If the decoupling assumption is valid, the paper makes a useful empirical contribution: it is one of the first attempts to separately measure decomposition and composition abilities for N2F in an unfamiliar formal language, and its finding that decomposition is the weaker capability across five diverse models is striking and practically relevant. The framework is reusable, the dataset and code are released, and the error taxonomy (primitive confusion, primitive fiction, variable misuse, redundancy, omission, incorrect meaning) is a sensible qualitative contribution. The additional settings for compositional gaps and counter-intuitive names are also well-motivated. The main value of the paper is therefore as an evaluation methodology plus a set of reproducible headline findings; both currently hinge on an identification assumption that the paper does not validate.
major comments (3)
- [Section 2.4, Table 1] The decoupling metric Dd = Pc - Pdc rests on an unvalidated identification assumption. The Pc condition and the Pdc condition differ not only in whether the model must infer primitive meanings and formats, but also in the number of demonstrations (up to four additional exemplars in Pc), in the length and syntactic form of the demonstrations (single-step versus multi-step expressions), and in whether the model ever sees compositional use of the primitives before the test item. The paper asserts that Pc - Pdc isolates the additional error caused by decomposition, but provides no ablation, filler-example control, or human baseline to show that the other differences are negligible. Since the margins Dd - Dc are as small as 4.65 points (DeepSeek-2.5) and 6.50 points (Claude-3.5 and Llama-3.1), a small confound could change the ordering for several models. I would like to see a control that matches demonstration count and format across the two conditions, for example by adding the primitive demonstrations to the three full demonstrations, or by replacing the three full demonstrations with an equal number of single-step demonstrations in the Pdc condition.
- [Section 2.2, Section 3.2] The results are point estimates with no reported variance, even though demonstration samples are randomly selected. Setting temperature to 0 removes decoding stochasticity but does not remove the variance induced by the random choice of demonstrations. With 323 test samples and Dd-Dc margins as low as 4.65 points, the claim that all five models show Dd > Dc would be more convincing if the authors reported repeated runs with different random demonstration draws, or at least a bootstrap confidence interval. This concern also propagates to the Section 4 setting-effect estimates, which compare point estimates across conditions.
- [Section 4, Eqs. (1)-(2)] The setting-effect estimates reuse the same additive decoupling assumption without checking for interactions between decomposition and composition. Specifically, Delta_c^s = Pc^s - Pc and Delta_d^s = (Pdc^s - Pdc) - Delta_c^s assume that the total change in Pdc decomposes into independent composition and decomposition components. If the demonstrations in the 0% gap or 100% gap settings also change the difficulty of primitive inference (for example, by altering which primitives are demonstrated or how they are used in context), then the reported Delta_d^s values are biased. The paper should either validate the additive assumption with targeted controls or present the raw Pdc^s and Pc^s values with a sensitivity analysis that shows the qualitative conclusions are robust to alternative decompositions.
minor comments (5)
- [Section 3.3, Table 3] The error-type counts are small in several cells (e.g., Claude-3.5 has only two errors in the Pc condition), so statements about the 'wide coverage' of error types should be phrased as descriptive observations rather than as strong generalizations, or accompanied by confidence intervals.
- [Section 2.2] The paper should state how many random demonstration selections were used for each test sample and whether a fixed seed was used; this would help readers interpret the reproducibility of the point estimates.
- [Section 4.1.1] The reference to Kim and Linzen (2020) is duplicated in the third sentence; one of the two occurrences should be removed.
- [Figure 2 caption] The caption says 'the sample construction of the STD framework,' but the framework is called DEDC; this appears to be a typo.
- [Appendix B.1] The grammatical-divergence re-experiment is run only on DeepSeek and changes both Pc and Pdc by 0.31 points; this is a useful sanity check but should be reported as a single anecdotal data point rather than as evidence that grammatical divergence has no effect on other models.
Circularity Check
No circularity is present: the DEDC metrics are direct measurements of model accuracy, the Section 4 residual effects are empirical differences, and the only self-citation is non-load-bearing background.
full rationale
The paper's claimed chain is measurement, not derivation: Dc = 100 - Pc and Dd = Pc - Pdc (Section 2.4) are arithmetic transforms of accuracies measured on the constructed tasks. The headline finding Dd > Dc is an empirical ordering of those measured values, not an identity forced by the definitions; nothing in the definitions constrains Pc - Pdc to exceed 100 - Pc. The Section 4 additional-setting effects, △s_c = P^s_c - P_c and △s_d = (P^s_dc - P_dc) - △s_c, are likewise differences of independent measurements, and no equation in the paper defines a construct in terms of the conclusion it is used to support. The main threat to the paper's interpretation is the identification assumption that the Pc condition removes decomposition while leaving composition unchanged: Pdc uses three full multi-step demonstrations while Pc uses one simplest sample per primitive, so Pc - Pdc can also absorb differences in demonstration count, format, and composition practice. That is a validity or measurement concern, not circularity under the required standard: the paper does not fit a parameter to a subset of data and then predict a closely related quantity, and the assumption is not secretly encoded as a result. The only self-citation (Xu and Wang 2024, SPOR) appears in Section 4.1.1 as one of several citations for the importance of compositional generalization and is not used to justify the DEDC decoupling or to rule out alternative metrics. Consequently there is no load-bearing self-citation, imported uniqueness theorem, or ansatz-by-citation in the paper.
Assumptions & free parameters
assumptions (4)
- ad hoc to paper The Pc condition removes the need for decomposition, so Dd = Pc - Pdc isolates decomposition deficiency.
- domain assumption Primitive names f0-f9 carry no prior meaning to the LLMs.
- domain assumption The 323 generated samples and templates are representative of N2F decomposition/composition.
- domain assumption Three demonstration samples are sufficient for LLMs to learn the primitives and composition rules.
Cite this review
Pith. "Pith review of Investigating the (De)Composition Capabilities of Large Language Models in Natural-to-Formal Language Conversion." pith.science (2026). https://pith.science/paper/L5JNTRQU
@misc{pith2026250114649,
author = {Pith},
title = {Pith review of: Investigating the (De)Composition Capabilities of Large Language Models in Natural-to-Formal Language Conversion},
year = {2026},
howpublished = {\url{https://pith.science/paper/L5JNTRQU}},
note = {Machine review of arXiv:2501.14649}
}
read the original abstract
To achieve generalized and robust natural-to-formal language conversion (N2F), large language models (LLMs) need to have strong capabilities of decomposition and composition in N2F when faced with an unfamiliar formal language and be able to cope with compositional gaps and counter-intuitive symbolic names. To investigate whether LLMs have this set of basic capabilities in N2F, we propose the DEDC framework. This framework semi-automatically performs sample and task construction, allowing decoupled evaluation of the set of decomposition and composition capabilities of LLMs in N2F. Based on this framework, we evaluate and analyze the most advanced LLMs, and the main findings include that: (1) the LLMs are deficient in both decomposition and composition; (2) the LLMs show a wide coverage of error types that can be attributed to deficiencies in natural language understanding and the learning and use of symbolic systems; (3) compositional gaps and counter-intuitive symbolic names both affect the decomposition and composition of the LLMs. Our work provides a new perspective for investigating the basic capabilities of decomposition and composition of LLMs in N2F. The detailed analysis of deficiencies and attributions can help subsequent improvements of LLMs.
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Reviewed August 10, 2026 · model on record in the stance chip above.
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