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REVIEW 4 major objections 4 minor 40 references

Predictable Emergent Abilities of LLMs: Proxy Tasks Are All You Need

T0 review · 4 major / 4 minor · reviewed 2026-08-11 · deepseek-v4-flash

Pith's one-line read Emergent abilities like tool use can be predicted early in training from carefully chosen simple proxy tasks, and the paper shows the prediction holding across five differently trained models.

desk verdict A plausible two-stage proxy-task selection method, but the validation is too thin to back the strong-correlation claim; still worth a referee. read the letter →

arxiv 2412.07111 v1 pith:C25AIZD6 submitted 2024-12-10 cs.CL

classification cs.CL
keywords emergentabilitiesproxytaskstoolutilizationearly-stageevaluationperformancepredictionscalinglawstaskrelevancerobustnessanalysis
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 takes aim at a known blind spot of scaling laws: they predict steady gains on tasks small models already perform, but not 'emergent' abilities that are absent in small or early-stage models. Its proposal is to predict such abilities anyway, by selecting simple, non-emergent tasks that are strongly and stably correlated with the target ability and blending their early-training scores into a single metric. Selection is data-driven: candidate tasks are ranked by how their scores across many existing models track the target benchmark's scores, then filtered by how robust each task is across small ensembles of models trained with different data versus different seeds. In a case study on tool use, the resulting early metric ranks five large models, trained with different annealing schedules and data mixes, almost exactly in the order of their final tool-use evaluations, while perplexity ranks them far less reliably. The paper's claim is that emergent abilities are predictable in advance if one measures the right simple tasks early.

What carries the argument

The load-bearing object is a two-stage selection pipeline built on a double-normalized performance matrix. Each candidate task is represented by a vector of scores across many models, normalized first across tasks and then across models, so that task difficulty and model scale do not dominate the comparison. Relevance to the target task is the Kendall rank correlation between the task vector and the target vector, chosen over Pearson and Spearman through a resampling check that keeps the variants whose top-ranked tasks survive random re-sampling of models. Robustness is the variance ratio $R_i = \sigma_{di}^2 / \sigma_{ri}^2$ between a task's scores on small models trained with varied data and on small models trained from varied seeds with identical data, the idea being that a stable proxy should be driven by data distribution, not random noise. The final proxy weight combines relevance with a sigmoid-transformed robustness score, and the early prediction is the normalized weighted average of the surviving tasks' scores.

What would settle it

Train a new family of models with a different architecture or substantially different data mix, and compare the paper's early proxy ranking against their final T-eval ranking; if the proxy ordering no longer matches, the relevance structure has shifted and the method fails. A cheaper check is to recompute the Kendall relevance rankings of the 42 candidate tasks on a fresh set of public models and see whether the top proxy tasks remain the same.

Watch

Extended reading notes

Core claim

The central claim is that the emergent ability of tool utilization, which scaling laws cannot forecast, is predictable from proxy tasks evaluated early in training. The authors build an early-stage metric from six selected multiple-choice tasks, weighting each by its Kendall correlation with the T-eval benchmark across 17 model pairs and by a robustness ratio that compares a task's variance across data-varied small models with its variance across seed-varied small models. They then show that this metric orders five large models, trained with or without learning-rate annealing and under three data-selection strategies, in nearly the same sequence as their final T-eval scores: only one pair of ten is reversed, versus four reversals for a perplexity-based ranking. This is presented as evidence that complex capabilities can be evaluated, and training configurations optimized, during the early phases of model development rather than after full training.

Load-bearing premise

The argument assumes that the task-relevance structure measured on 17 existing public model pairs carries over to newly trained models with different architectures, data mixtures, and training schedules, and the direct validation covers only five Qwen-based models under two kinds of training variation.

Editorial extensions

If this is right

  • Training configurations can be compared and adjusted at early checkpoints using the proxy metric, instead of waiting for full pretraining and fine-tuning.
  • Perplexity, the standard early-training metric, is a weaker ordering signal for tool-use capability than the selected proxy blend.
  • The same selection pipeline applies to other emergent abilities by substituting the target benchmark and the candidate task pool.
  • Because candidate-task scores are drawn from public leaderboards, choosing proxies requires no additional large-model evaluations.

Reading between the lines

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

  • If the relevance structure proves stable across training regimes, the proxy metric could serve as an optimization signal for data-mix and schedule choices, not just a diagnostic.
  • The variance-ratio robustness test is a general screening tool that could identify which benchmarks deserve trust at small scale, apart from any prediction goal.
  • The results support a picture in which tool use is not a discontinuous capacity but a composite of measurable precursors, suggesting that apparent 'emergence' may partly be an artifact of evaluation scale.
  • A stress test the paper does not run is applying the full pipeline to a second emergent ability and to a non-Qwen model family before the method is relied on.
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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

4 major / 4 minor

Summary. The paper proposes a method for predicting emergent LLM abilities from proxy tasks before the ability has developed. It defines task relevance as the correlation of normalized performance vectors across 17 public chat/base model pairs, validates candidate tasks using a robustness score computed from small Qwen-1.8B models trained on different data mixtures or random seeds, and then claims to integrate relevance and robustness into a weighted proxy score. In a case study on T-eval tool utilization, the authors compare proxy-task rankings of five Qwen-18B pretraining checkpoints (two annealing variants and three data-mixture variants) with post-SFT T-eval rankings and report one reversed pair for their preferred Vbc strategy.

Significance. If the method were fully specified and validated, it would offer a practical way to monitor early-stage training checkpoints and to compare training configurations without running costly target-task evaluations. The idea of transferring correlation structures from public leaderboard models to new training runs is attractive, and the two-stage relevance-plus-robustness selection is clearly presented. The manuscript's strengths are its concrete case study, its use of publicly available benchmark results, and the reproducible small-model robustness experiments. However, the current evidence does not establish the central claim: the final prediction score is not given in closed form, the relevance and robustness thresholds are free parameters, the validation set consists of five same-architecture models, and the robustness metric's interpretation is questionable. As presented, the work is a proposal with an illustrative case study rather than a validated predictive method.

major comments (4)
  1. [Section 3.3, Tables 6, 8, 10] The final prediction score is not defined in closed form. Section 3.3 defines Si = Ci * f(Ri) and normalized weights Wi, but the manuscript never reports the values of epsilon_C, epsilon_R, k, or the normalization used to produce the 'Proxy Task' and 'Vbc' numbers in Tables 6, 8, and 10. Since the Vbc column of Table 10 reproduces exactly the 'Proxy Task' rows of Tables 6 and 8, a reader cannot determine whether the published predictions actually implement the proposed relevance-robustness weighting, and the claimed integration cannot be independently reproduced. Please provide the exact formula and all parameter values, together with a sensitivity analysis of the results to those parameters.
  2. [Section 4.3, Table 10] The validation is too narrow to support the claim of a 'strong correlation'. The five models are all 18B-parameter Qwen models with the same architecture and the same SFT recipe, and the only reported agreement statistic is the number of reversed pairs (1/10 for Vbc). With five items, a single inversion yields Kendall's tau = 0.8, and since three prediction strategies are compared, the evidence is marginal even before considering that the relevance weights were estimated from the same model family in Section 4.1. No confidence intervals, no per-model absolute errors, and no held-out architecture or training configuration are reported. The transfer of the correlation structure from 17 public model pairs to new training runs is therefore asserted rather than demonstrated.
  3. [Section 3.2] The robustness score Ri = sigma^2_d / sigma^2_r is not a measure of robustness in the usual sense. A task whose scores vary strongly across data-mixture pretraining runs is highly sensitive to data distribution, which is a form of instability; interpreting a high variance ratio as 'stronger robustness' is a non sequitur. The small ensemble sizes (three random-noise models and five data-variability models) also make the variance ratio noisy, and no uncertainty is reported. The selection of C3 and CHID as the most robust tasks may therefore reflect task-specific sensitivity to data mixture rather than reliability.
  4. [Sections 3.1 and 4.1, Table 2] The performance-vector notation is inconsistent and appears to be transposed. Section 3.1 defines m as the number of models and n as the number of tasks, but Section 4.1 says 'construct an m-dimensional performance vector, where m = 42', while 42 is the number of candidate tasks and the number of model pairs is 17. Please fix the notation and confirm that the correlation analysis uses the correct dimensions. Additionally, two rows in Table 2 pair models that do not match (Baichuan2-13B-Chat with Baichuan2-7B-Base, and Mistral-7B-Instruct-v0.2 with Mixtral-7B-v0.1); these mismatches should be corrected or justified, because they directly affect the estimated relevance values.
minor comments (4)
  1. [Section 4.1, Figure 1] Figure 1 is referenced in the text but its content is not described; if it contains the top-task rankings, the reader cannot verify the claim that reasoning and problem-solving tasks dominate the top ten without the figure.
  2. [Section 2] The citation for OpenCompass appears to be incorrect: the benchmark suite OpenCompass is not authored by Buitrago and Nystrom (2019), and the reference should be replaced with the appropriate OpenCompass documentation or paper.
  3. [Section 4.3] The abstract and conclusion claim a 'strong correlation' between predicted and actual performance, but no correlation coefficient, confidence interval, or significance test is reported; the rank-inversion count alone is insufficient to support that wording.
  4. [Section 3.3] The thresholds epsilon_C and epsilon_R are introduced but never specified or varied; if they are chosen by hand on the validation set, the method is not parameter-free, and the reported results may be optimistic.

Circularity Check

0 steps flagged · score 0.0 of 10

The proxy-task predictor is fit on 17 public model pairs and then applied to five newly trained Qwen checkpoints; the validation target (T-eval) is not used to construct the proxy scores, so the central claim is not circular, though its external-validity evidence is thin.

full rationale

The derivation chain is: estimate relevance C_i by correlating each candidate task's performance vector with T-eval across the 17 existing chat/base pairs (Sec. 4.1); estimate robustness R_i from variance ratios of small Qwen-1.8B ensembles (Sec. 4.2); form weighted proxy scores S_i = C_i f(R_i) and normalize (Sec. 3.3); then evaluate five newly pretrained Qwen-18B checkpoints on the chosen proxies early in training and separately, after SFT, on T-eval (Sec. 4.3). The T-eval scores of the five validation models enter only as the comparison target in Table 10, not as inputs to the proxy-score construction. The weights are fitted to a training set of 17 models that excludes the five validation runs, so the Table 10 rank comparison is an out-of-sample check. This is a standard supervised-transfer setup; it may be under-powered (n=5, one architecture, same SFT recipe) and the proxy aggregate is under-specified (epsilon_C, epsilon_R, k, and closed form of Vbc are missing), but those are reproducibility and external-validity concerns, not circularity. No self-citation is load-bearing and no result is equivalent to its inputs by construction. Therefore no circular step is identified.

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

The method depends on several unspecified thresholds and an unstated prediction formula. The robustness metric's interpretation is an assumption, and the transferability of relevance scores from existing models to new training runs is assumed.

free parameters (4)
  • Relevance threshold epsilon_C
    Mentioned in Section 3.3 as a filter for candidate tasks, but no value or selection procedure is given.
  • Robustness threshold epsilon_R
    Same, no value given.
  • Sigmoid slope k in f(x)=1/(1+e^{-kx})
    Introduced in Section 3.3 without specifying k or how it is chosen.
  • Number of selected proxy tasks = 6
    The validation uses six tasks (C3, CMNLI, OCNLI, CHID, RTE, CMMLU), but the paper does not explain how thresholds yield exactly these six.
assumptions (4)
  • domain assumption Performance vectors across models can be normalized and correlated to reveal task relevance
    Section 3.1 constructs feature and sample normalized performance vectors and assumes correlations among them reflect shared task requirements.
  • domain assumption A high variance ratio sigma_d^2/sigma_r^2 marks a robust proxy task
    Section 3.2 defines robustness R_i = sigma_d^2/sigma_r^2 and interprets higher ratios as stronger robustness, though high sensitivity to data distribution could equally indicate instability.
  • domain assumption Proxy task performance at early training predicts target task performance after full training and SFT
    Section 4.3 validates on 5 models, implicitly assuming the correlation structure observed on existing models transfers to new training runs.
  • domain assumption T-eval is a valid measure of emergent tool-use ability
    Section 4 selects T-eval as the target benchmark without justifying it as the canonical tool-use metric.

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Cite this review

Pith. "Pith review of Predictable Emergent Abilities of LLMs: Proxy Tasks Are All You Need." pith.science (2026). https://pith.science/paper/C25AIZD6

@misc{pith2026241207111,
  author       = {Pith},
  title        = {Pith review of: Predictable Emergent Abilities of LLMs: Proxy Tasks Are All You Need},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/C25AIZD6}},
  note         = {Machine review of arXiv:2412.07111}
}
read the original abstract

While scaling laws optimize training configurations for large language models (LLMs) through experiments on smaller or early-stage models, they fail to predict emergent abilities due to the absence of such capabilities in these models. To address this, we propose a method that predicts emergent abilities by leveraging proxy tasks. We begin by establishing relevance metrics between the target task and candidate tasks based on performance differences across multiple models. These candidate tasks are then validated for robustness with small model ensembles, leading to the selection of the most appropriate proxy tasks. The predicted performance on the target task is then derived by integrating the evaluation results of these proxies. In a case study on tool utilization capabilities, our method demonstrated a strong correlation between predicted and actual performance, confirming its effectiveness.

Figures

Figures reproduced from arXiv: 2412.07111 by the authors.

Figure 1
Figure 1. Task relevance measured using Pearson, Spear [PITH_FULL_IMAGE:figures/full_fig_p006_1.png] view at source ↗

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Reference graph

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