REVIEW 4 major objections 4 minor 2 cited by
The paper sets out to determine which ingredients actually drive targeted instruction selection for LLM fine-tuning, and concludes that the data representation—not the selection algorithm—is the decisive component: only gradient-based repre
Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →
T0 review · deepseek-v4-flash
2026-08-02 23:05 UTC pith:GBEBBKCK
load-bearing objection A genuinely useful empirical comparison, but the abstract's 'consistently predicts' overstates downstream evidence; worth a serious referee after a revision. the 4 major comments →
A Critical Look at Targeted Instruction Selection: Disentangling What Matters (and What Doesn't)
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
The paper's central claim is that targeted instruction selection is best understood as approximate distance minimization between the selected subset and the query set, and that the data representation used to compute that distance is the decisive component. Concretely, only gradient-based representations—low-dimensional projections of Adam update vectors computed during warm-up training, as in LESS—produce subset-query distances that correlate monotonically with query-set loss and downstream performance. Under these representations, greedy round-robin selection is the strongest method at small budgets, while unbalanced optimal transport offers modest gains at larger budgets. The advantage ov
What carries the argument
The central object is the subset-to-query distance computed in a representation space. The paper's key representation is gradient-based: each instruction-response pair becomes a low-dimensional random projection of Adam update vectors, aggregated across checkpoints of a warm-up-trained LoRA model (the LESS representation). Selection algorithms are then viewed as approximate minimizers of a distributional distance—chiefly the 1-Wasserstein distance between the empirical distributions of the selected subset and the query set. Theorem 6.1 bounds test loss by the sum of the subset-query Wasserstein distance, an irreducible query-test mismatch term, training error, and an ideal joint error; Theor
Load-bearing premise
The load-bearing premise is that the small query set (8–81 examples per task) faithfully represents the true target-test distribution; if the query set is unrepresentative or contaminated, minimizing distance to the query set is untethered from actual test performance.
What would settle it
Construct a benchmark where the query set is drawn from an easy or distributionally close slice of a task while the held-out test set comes from a hard or shifted slice; then run LESS-based greedy round-robin at a 500-example budget. If selection then fails to beat random sampling, or if the Spearman correlation between LESS distance quantiles and query loss is near zero, the paper's central claim that gradient representations make distance predictive would be refuted.
If this is right
- At small budgets, practitioners should use gradient-based representations (LESS) with greedy round-robin selection; it beats hidden-state and embedding-based methods on most of the five tasks and several models.
- At large budgets, optimal-transport selectors (UOT, KNN-KDE) become competitive, but no method reliably beats random sampling.
- A subset's distance to the query set should not be trusted as a selection signal unless it is computed with gradient-based representations.
- Cheap proxy models with about 135M parameters can produce LESS representations that match or beat full-model representations, cutting the compute cost of selection.
- The theoretical bounds imply that the advantage of any query-aware method over random has a hard ceiling set by pool-query mismatch and the dimension-driven B^{-1/d} decay.
Where Pith is reading between the lines
- A practical extension the paper leaves implicit: use distance-based selection only under a critical budget threshold, then fall back to random sampling to save compute once the B^{-1/d} catch-up becomes visible.
- The paper excludes saturated tasks where zero-shot performance is already high; an implicit corollary is that targeted selection is only worth doing when the base model has clear headroom on the target task, and skipping selection entirely is a legitimate option.
- LESS-selected subsets are shorter on average than those from embedding-based methods, so part of its advantage may come from length regularization rather than pure gradient influence; a testable follow-up is to control for token length before comparing selection methods.
- The theory suggests a new algorithm family: directly minimize the 1-Wasserstein distance between subset and query while explicitly tolerating the measured pool-query mismatch, which could outperform both round-robin and current OT heuristics.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper presents a systematic, disentangled evaluation of targeted instruction selection for LLM fine-tuning, separating data representations (RDS+, EMBED, LESS) from selection algorithms (round-robin, doubly greedy, KNN-Uniform, KNN-KDE, and a proposed UOT method). It evaluates these components across five target tasks and several base models, with three-seed averaged experiments for the main budget sweeps. The authors report that gradient-based LESS representations give the most consistent relationship between subset-query distance and query loss, that greedy round-robin performs best at small budgets, that UOT/KNN-KDE become competitive at larger budgets, and that random sampling is a surprisingly strong baseline. The paper also contributes a theoretical unification of selection methods as approximate Wasserstein-distance minimizers, with two generalization bounds and a discussion of diminishing returns.
Significance. If the results hold, this is a valuable empirical contribution. The paper addresses a real fragmentation in the instruction-selection literature by controlling representation and selection algorithm separately, and it provides a rare multi-model, multi-task comparison with released code, three-seed averaging, and a strong random baseline. The finding that random sampling is competitive at larger budgets is practically important and helps explain conflicting results in prior work. The theoretical unification, while not the main contribution, offers a useful conceptual framing. The main risk is that the headline claim of consistent prediction is broader than the reported evidence supports, especially for downstream performance on newer models; the paper's own appendix contains multiple wrong-sign correlations. The theory also has proof gaps that need attention.
major comments (4)
- [Abstract; Section 5.1; Appendix M] The abstract claims that only gradient-based representations choose subsets whose similarity to the query 'consistently predicts performance across datasets, models, and candidate pools.' The downstream Spearman correlations in Figure 3 and Appendix M (Figures 15-18) contradict this for a substantial fraction of model-task pairs: positive (wrong-sign) or weak correlations for LESS appear in 7 of 25 pairs, including Llama-2 Codex (+0.72), Llama 3.2 Codex (+0.28), SmolLM3 BBH (+0.88), SmolLM3 Codex (+0.68), SmolLM3 MMLU-Pro (+0.28), Qwen3 BBH (+0.18), and Olmo3 BBH (+0.58). The manuscript itself concedes in Section 5.1 that 'trends are less consistent on downstream performance with newer, over-trained models.' Please restrict the 'consistently predicts' claim to query loss, or explicitly scope it to downstream performance and temper the practical guidance accordingly.
- [Section 5.1, Figures 2-3] The central correlation analysis rests on single training runs. Figures 2 and 3 report Spearman correlations over 10 distance quantiles, but there are no confidence intervals, seed repetitions, or significance tests for these correlations. This is unlike the budget experiments in Sections 5.2-5.3, which average over three seeds. Given that the paper's central claim is about consistency of correlation, please provide seed-resampled uncertainty estimates or at minimum state explicitly that the quantile experiment is single-run and therefore should be interpreted with caution.
- [Theorem 6.1, Eq. (1), Lemma L.1] The proof of Theorem 6.1 is not justified by the cited lemma. Lemma L.1 (Appendix L.1) is a high-probability bound for samples S and T drawn i.i.d. from underlying measures P_S and P_T. In Theorem 6.1, S is an arbitrary deterministic subset of the candidate pool D, and the proof applies Lemma L.1 twice treating S and then Q as source samples. Without an i.i.d. or exchangeability assumption on S, the probabilistic statement does not follow from Lemma L.1. Additionally, Eq. (1) contains L_S(theta_S) and a term lambda-tilde that depends on S (through the L_S term in its definition), so the sentence 'only W1(P_S, P_Q) is directly affected by the choice of S' is not consistent with the displayed bound. Please repair the proof or state clearly the additional conditions under which the bound is valid.
- [Section 6.2, Theorem 6.2, Figure 8] Theorem 6.2's assumptions (mu-strong convexity of the empirical risk, K-Lipschitzness of L_T, and Gtheta_z-Lipschitz gradients) are not verified for the LoRA fine-tuning setup used in the experiments. The qualitative statement about diminishing returns is plausible and empirically supported, but the quantitative reference to a B^{-1/d} decay with d=8192 in Figure 8 is illustrative only; the constants and residual terms in the bound are not measured. Please clarify that the empirical agreement is qualitative and that the theorem does not provide a fitted decay law for the actual training setup.
minor comments (4)
- [Section 3.2, Appendix D] The term 'gradient-based representations' is used throughout, but LESS actually combines LoRA gradients with Adam update vectors and random projections. Please make this explicit in the main text to avoid confusion with full-gradient influence methods.
- [Table 1] The budget for Xia et al. is written as '13,533' while the text elsewhere uses '13,533' consistently; please harmonize comma styling across tables and text.
- [Figures 2, 3, 9, 10] TyDiQA is rendered as 'T yDiQA' in the figure panels and captions; please fix the spacing.
- [Appendix B, Table 2] The Codex split is described as '164 examples' in Appendix B, and Table 2 lists 16 query + 148 test = 164; please verify the arithmetic and clarify the split in one place.
Circularity Check
No circularity found: the central claims rest on empirical forks and explicit-assumption bounds, not on fitted inputs or load-bearing self-citations.
full rationale
The paper's main empirical claims are genuine empirical forks. Section 5.1 trains models on distance-stratified quantiles and measures Spearman correlations; Sections 5.2-5.3 train on selected subsets and compare against random and zero-shot baselines. The selection representations (RDS+, EMBED, LESS) and most selection algorithms are adopted from prior external work rather than fit to the reported trends, and the new UOT algorithm is presented with fixed hyperparameters rather than tuned to the results. LESS is itself an influence estimator, so finding that LESS distance correlates with query loss validates an approximation rather than being forced by construction: the paper trains full models and observes whether the ordering holds after nonlinear fine-tuning. The theoretical results (Theorems 6.1 and 6.2) are derived from explicit assumptions (strong convexity, Lipschitzness, loss form, bounded support) and do not assume the conclusion; the bounds explicitly include irreducible terms such as W1(P̂_Q, P̂_T), L_S(θ_S), and λ̃. The 'distance minimization' unification is an interpretive framing and does not feed back into the empirical comparisons. The only self-citations (Alvarez-Melis & Fusi 2020 in Appendix C; Hulkund et al. 2025 in Related Work) are non-load-bearing, and the central derivation is independent of them. The paper itself flags a genuine limitation in Appendix M: LESS query-loss correlations are consistent but downstream correlations are 'less consistent with newer, over-trained models.' This weakens the abstract's universal phrasing but is a robustness/correctness concern, not circularity. No equation or fitted parameter reduces to the paper's conclusions by construction.
Axiom & Free-Parameter Ledger
free parameters (4)
- UOT marginal relaxation τ2 =
0.0001
- UOT entropy regularization ε =
0.01
- KNN-KDE hyperparameters (L, KKDE, σ, C) =
L=5000, KKDE=1000, σ=0.75, C=5.0
- LoRA rank/α/dropout =
rank=128, α=512, dropout=0.1
axioms (4)
- domain assumption Query set Q is an i.i.d. sample from the target task distribution T.
- standard math Loss ℓ is symmetric, convex, bounded, satisfies triangle inequality, and has form |y-fθ(x)|^q for some q>0.
- domain assumption A1-A3: empirical risk µ-strongly convex, gradient Lipschitz in data, and ERM loss K-Lipschitz in parameters.
- domain assumption Wasserstein distance in embedding space is a meaningful proxy for task-relevant similarity.
read the original abstract
Instruction fine-tuning of large language models (LLMs) often involves selecting a subset of instruction training data from a large candidate pool, using a small query set from the target task. Despite growing interest, the literature on targeted instruction selection remains fragmented and opaque: methods vary widely in selection budgets, often omit zero-shot baselines, and frequently entangle the contributions of key components. As a result, practitioners lack actionable guidance on selecting instructions for their target tasks. In this work, we aim to bring clarity to this landscape by disentangling and systematically analyzing the two core ingredients: data representation and selection algorithms. Our framework enables controlled comparisons across models, tasks, and budgets. We find that only gradient-based data representations choose subsets whose similarity to the query consistently predicts performance across datasets, models, and candidate pools. While no single method dominates, gradient-based representations paired with greedy round-robin selection often perform best on average at low budgets, but these gains diminish at larger budgets. Finally, we unify several existing selection algorithms as forms of approximate distance minimization between the selected subset and the query set, and support this view with new generalization bounds. More broadly, our findings provide critical insights and a foundation for more principled data selection in LLM fine-tuning. The code is available at https://github.com/dcml-lab/targeted-instruction-selection.
Figures
Forward citations
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@esa (Ref
\@ifxundefined[1] #1\@undefined \@firstoftwo \@secondoftwo \@ifnum[1] #1 \@firstoftwo \@secondoftwo \@ifx[1] #1 \@firstoftwo \@secondoftwo [2] @ #1 \@temptokena #2 #1 @ \@temptokena \@ifclassloaded agu2001 natbib The agu2001 class already includes natbib coding, so you should not add it explicitly Type <Return> for now, but then later remove the command n...
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[72]
\@lbibitem[] @bibitem@first@sw\@secondoftwo \@lbibitem[#1]#2 \@extra@b@citeb \@ifundefined br@#2\@extra@b@citeb \@namedef br@#2 \@nameuse br@#2\@extra@b@citeb \@ifundefined b@#2\@extra@b@citeb @num @parse #2 @tmp #1 NAT@b@open@#2 NAT@b@shut@#2 \@ifnum @merge>\@ne @bibitem@first@sw \@firstoftwo \@ifundefined NAT@b*@#2 \@firstoftwo @num @NAT@ctr \@secondoft...
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First, the query set (stars) and candidate pool (dots) are encoded as data representations
@open @close @open @close and [1] URL: #1 \@ifundefined chapter * \@mkboth \@ifxundefined @sectionbib * \@mkboth * \@mkboth\@gobbletwo \@ifclassloaded amsart * \@ifclassloaded amsbook * \@ifxundefined @heading @heading NAT@ctr thebibliography [1] @ \@biblabel @NAT@ctr \@bibsetup #1 @NAT@ctr @ @openbib .11em \@plus.33em \@minus.07em 4000 4000 `\.\@m @bibit...
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