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Estimating the Effects of Sample Training Orders for Large Language Models without Retraining

T0 review · 1 major / 4 minor · reviewed 2026-08-07 · deepseek-v4-flash

Pith's one-line read The paper claims that the effect of any training-sample order on a large language model's final parameters can be estimated from one reference training run, using Taylor expansions of the optimizer update and random-projection storage, so…

desk verdict A genuinely useful question and a concrete pipeline, but the core Taylor derivation ignores Adam's path-dependent optimizer state and the appendix's Hessian substitute is not a Hessian, so the estimates are not grounded. read the letter →

arxiv 2505.22042 v1 pith:6KHFQ2IJ submitted 2025-05-28 cs.LG cs.AI

classification cs.LGcs.AI
keywords sampleorderretraining-freeestimationAdamoptimizerTaylorexpansionrandomprojectioncurriculumlearningmemorizationgeneralization
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

Training order influences how large language models learn, but measuring that influence by retraining for each order is infeasible. The paper proposes a retraining-free framework (FUT) that reconstructs the parameter trajectory under a permuted batch order from checkpoints of a single reference run. It does this by treating the Adam update term as a function of the current parameters and applying first- or second-order Taylor expansions, so the update for any batch at any step can be expressed using stored terms. Random projection keeps the stored terms small enough for LLM-scale parameter counts. The paper reports that estimated validation perplexities land within roughly 0.0085 to 0.0703 of retrained values on a 636M-parameter model and that the method becomes increasingly cheaper than retraining as more orders are evaluated.

What carries the argument

The load-bearing object is the Adam update term $\Gamma(\theta, B)$, viewed as a function of the parameters $\theta$; the framework expands $\Gamma(\gamma_t, B_{l_t})$ around the reference checkpoint $\theta_t$ using a Taylor series, converting an unknown update under a permuted order into known quantities $\Gamma(\theta_t, B_{l_t})$, $\nabla_\theta \Gamma(\theta_t, B_{l_t})$, and in the enhanced version $\nabla^2_\theta \Gamma(\theta_t, B_{l_t})$. To avoid storing a full matrix for every pair, the framework compresses these terms with a Gaussian random projection based on the Johnson-Lindenstrauss dimension-reduction guarantee and reconstructs them via the Moore-Penrose pseudoinverse. The Hessian of the loss is not computed exactly; it is replaced by a secant quotient $(\nabla_\theta L(B; \theta_t) - \nabla_\theta L(B; \theta_{t-1}))/(\theta_t - \theta_{t-1})$, and the third-order term in the enhanced version is approximated similarly. These pieces let the estimation stage run recursively, one forward or backward pass per stored pair, with $O(T^2 C)$ total cost compared with $O(T \cdot C \cdot T!)$ for exhaustive retraining.

What would settle it

Train a 636M-parameter model once for $T=16$ batches in a reference order and store the checkpoints; use the paper's method to predict the validation perplexity for a randomly permuted order, then retrain from the same initialization on that permuted order. If the absolute difference between predicted and retrained perplexity is larger than the spread among random-order retraining runs, or grows as $T$ increases from 8 to 256, the central claim fails.

Watch

Extended reading notes

Core claim

The central discovery is that the trajectory of an LLM trained with a permuted batch order can be written as a recursion over the reference trajectory: $\gamma_{t+1} = \gamma_t - \eta \Gamma(\theta_t, B_{l_t}) - \eta(\gamma_t - \theta_t)\nabla_\theta \Gamma(\theta_t, B_{l_t})$, where $\Gamma(\theta, B) = m/(\sqrt{v}+\epsilon)$ is the Adam update term and the gradient term is evaluated at the reference checkpoint $\theta_t$. All quantities on the right come from the reference run, so arbitrary orders can be simulated without retraining. A second-order version adds a curvature term $c(\gamma_t - \theta_t)^2 \nabla^2_\theta \Gamma(\theta_t, B_{l_t})$ and generally improves accuracy in the reported experiments. The paper validates the approximation by comparing predicted perplexity to retrained perplexity across $T=8$ to $256$ batches, and applies it to curriculum search and to measuring position-dependent memorization and generalization.

Load-bearing premise

The load-bearing premise is that shifting the model's parameters a little changes the optimizer update in a smooth, nearly linear way, and that the curvature of the loss can be read off the previous step's change in gradients; if those approximations fail, the predicted checkpoints for a reshuffled order will drift from the actually retrained ones.

Editorial extensions

If this is right

  • After one reference run, any number of candidate training curricula can be scored by estimated validation perplexity; the paper's genetic search uses those scores to choose an order and reports lower perplexity than random, sample-length, and perplexity-based curricula.
  • The estimated parameter trajectories reproduce the retrained memorization pattern that later batches are memorized better (lower perplexity) and earlier batches are more prone to forgetting, without running the model again for each position.
  • Batches whose content is similar to the test set generalize better when placed later in training, while dissimilar batches show little or random positional effect; the estimated curves match the retrained curves in the reported experiments.
  • Because only the update rule changes, the same Taylor-transfer construction extends to other batch-based optimizers such as SGD, as the paper states.

Reading between the lines

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

  • If the Taylor transfer holds as reported, order effects are effectively determined by pairwise interactions between reference checkpoints and batches, suggesting a low-dimensional 'order kernel' might predict order effects on new datasets without additional full runs.
  • The same stored update terms could answer influence-style questions—removing, duplicating, or reweighting a batch—since those are limiting cases of reordering, although the paper does not test this.
  • The framework implies that estimate error should grow with learning rate and total batch count, because larger parameter displacements push the expansion further from the reference trajectory; the reported $T=16$ case has the largest gap, so a natural extension is an adaptive rule deciding when the second-order term is necessary.
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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

1 major / 4 minor

Summary. The paper proposes FUT, a framework that claims to estimate, without retraining, the model parameters and perplexity of a large language model trained on arbitrary permutations of a given mini-batch sequence. A single reference training run provides checkpoints θ_t; for every pair (θ_t, B_l) the paper precomputes the Adam update term Γ(θ_t, B_l) and its first- and second-order derivatives, compresses them with random projections, and then simulates a target permutation by recursively applying a Taylor expansion of Γ around the reference checkpoints. The framework is applied to training-curriculum search and to memorization/generalization analysis. Experiments on a 636M-parameter LLaMA-style model report AbsDiff values below a Random baseline, curriculum perplexity improvements, and scaling experiments up to 1.4B parameters.

Significance. If the central derivation were valid, the framework would address a genuinely important computational bottleneck: it would turn an O(T!)-cost problem into an O(T^2)-cost precomputation plus cheap recursive estimation. The paper has real empirical ambition, including repeated retraining for validation, intermediate-step perplexity tracking, and two downstream applications, and it is honest in reporting that only perplexity is used as the outcome metric. However, the load-bearing mathematical steps are not sound: the Taylor recurrence is built on an invalid secant substitute for the Hessian, and the Adam momentum state is taken from the reference trajectory rather than from the permuted one. These issues are not cosmetic; they mean Eqs. (3)-(8) do not describe the trajectory of the permuted training run, and the empirical numbers cannot be read as validating the proposed mechanism. The self-reported limitations in Appendix F (Taylor accuracy and projection noise) do not mention either of these structural defects.

major comments (1)
  1. [Eqs. (5)-(6), Appendix A.1] The manuscript text in Section 5.1 reports AbsDiff values as evidence that the method reproduces retrained perplexities. However, the second-order weight c in Eq. (7) is never specified or selected in the paper, the parameter clipping threshold in Section B.1.3 is tuned from a range, and the random-projection dimension k is chosen empirically per layer and update type (Appendix A.2). With these tunable elements undisclosed, Table 1 measures the tuned pipeline rather than the Taylor expansion itself, and the main empirical claim is not reproducible from the information given.
minor comments (4)
  1. [Abstract and Figure 1] The abstract says the method uses random projection to store intermediate checkpoints, whereas Figure 1 and Section 3 correctly state that update terms and gradient terms are stored; the wording should be aligned.
  2. [Appendix A.1, Eq. (11)] The sentence describing m_{t-1} and v_{t-1} says they are constructed from the gradient at the last step of the original training order, which is a special choice and not the only possible one; this should be stated as a modeling assumption rather than as a consequence of the Adam update.
  3. [Table 1 and Section 5.1] The Random baseline draws uniformly from the min-max range of the ground-truth perplexities, which are obtained by retraining; the comparison therefore does not isolate the difficulty of estimation without retraining and should be discussed as such.
  4. [Section 3, complexity comparison] The claimed O(T^2 C) complexity counts only forward/backward passes over batches but omits the cost of computing ∇²_θ L in Eq. (5) and the pseudoinverse recovery in Appendix A.2, both of which are non-negligible for LLM-scale parameters.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the FUT estimates are an approximation built from the standard Adam update rule and are validated against external retraining benchmarks.

full rationale

The paper's derivation chain is self-contained rather than circular. The central equations (1)-(2) are the standard Adam optimizer update rule, and Eq. (3)-(4) are a Taylor expansion of the update term as a function of the parameters, with the reference trajectory used only as the expansion base. The estimated trajectories are then compared against actual retraining results in Table 1 and Figures 3-5, i.e., external ground truth, not against the framework's own stored terms. The stored terms Γ(θ_t, B_l), ∇_θΓ(θ_t, B_l), and ∇²_θΓ(θ_t, B_l) are computed from reference checkpoints and then used recursively; no fitted parameter is renamed as a prediction. The concerns raised by the reader's take—the secant approximation of the Hessian in Appendix A.1, reuse of reference Adam moments, the unspecified constant c in Eq. (7), and the tunable clipping range in Appendix B.1.3—are correctness and robustness limitations, not cases where a predicted quantity is equal to an input by construction. The paper itself flags the Taylor-expansion validity, random-projection noise, and the perplexity-only evaluation in Section F (Limitations). These are legitimate scientific caveats but do not make the central claim circular. Consequently, no circular step can be exhibited from the paper's own equations.

Assumptions & free parameters 4 free parameters · 5 assumptions · 0 invented entities

The central derivation rests on several unproved modeling choices. Most serious is the secant replacement for the Hessian, which is not a true second derivative and enters every ∇θΓ term. The Adam state is carried over from the reference order, so permuted-order dynamics are not actually simulated. The second-order weight c and clipping range are tuned but not reported, and random projection recovery from JL-compressed rows has no reconstruction guarantee for the full Jacobian terms.

free parameters (4)
  • c (second-order Taylor weight) = not reported
    Equation (7) introduces c to weight the second-order term, but the paper never states its value or how it was chosen; the FUT++ results depend on this undisclosed constant.
  • parameter clipping threshold = selected from [-1.1,-0.3] U [0.3,1.1]
    Appendix B.1.3 clips estimated parameters to a tunable range chosen for numerical stability; no criterion or sensitivity analysis is given.
  • random projection dimension k = 300, 200, 160, 80, 20, or 8 by layer/update type
    Appendix A.2 sets k empirically to balance accuracy and memory; estimation error depends on these choices.
  • GA population size N and generations K = N in [16,12,8,4,2], K in [16,12,8,4,2,1] per T
    Table 3 in Appendix B.2.2 tunes these to the batch count; they affect the curriculum-search results and are not derived from any principle.
assumptions (5)
  • domain assumption The Adam update term Γ(θ,B) is sufficiently smooth that first- and second-order Taylor expansions around the reference checkpoint θ_t are accurate across the whole permuted trajectory.
    Invoked in Eqs (3) and (7) without an error bound; training dynamics of LLMs are highly nonlinear, so this is an unverified smoothness assumption.
  • ad hoc to paper The momentum state (m_t, v_t) from the reference training order can be reused when evaluating Γ(θ_t, B_l) for a permuted order.
    Appendix A.1 equations (10)-(11) construct m_t and v_t using the previous reference gradient rather than the permuted trajectory's gradient, effectively assuming the Adam state is order-independent.
  • ad hoc to paper The Hessian ∇²L(B_l; θ_t) can be replaced by (∇L(B_l; θ_t) - ∇L(B_l; θ_{t-1}))/(θ_t - θ_{t-1}) and the third derivative by a similar secant quotient.
    Appendix A.1 uses this elementwise vector division to approximate second and third order gradients; it is not a valid Hessian or third-derivative formula in parameter space.
  • domain assumption Recovering update matrices from random projections via the Moore-Penrose pseudoinverse preserves enough information for accurate parameter estimation.
    The JL theorem preserves pairwise distances, not individual high-dimensional matrices; Appendix A.2 provides no reconstruction error bound for the update terms after projection to dimensions as low as 8.
  • domain assumption Validation perplexity on WikiText-103 is a sufficient measure of LLM performance and of training-order effects.
    All experiments use perplexity only; Appendix F acknowledges downstream reasoning and understanding tasks are not validated, so the scope of the empirical claim is narrower than the abstract suggests.

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Cite this review

Pith. "Pith review of Estimating the Effects of Sample Training Orders for Large Language Models without Retraining." pith.science (2026). https://pith.science/paper/6KHFQ2IJ

@misc{pith2026250522042,
  author       = {Pith},
  title        = {Pith review of: Estimating the Effects of Sample Training Orders for Large Language Models without Retraining},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/6KHFQ2IJ}},
  note         = {Machine review of arXiv:2505.22042}
}
read the original abstract

The order of training samples plays a crucial role in large language models (LLMs), significantly impacting both their external performance and internal learning dynamics. Traditional methods for investigating this effect generally require retraining the model with various sample orders, which is computationally infeasible for LLMs. In this work, we improve traditional methods by designing a retraining-free framework. By approximating Adam optimizer updates with first- and second-order Taylor expansions and utilizing random projection methods to store intermediate checkpoints, our framework can efficiently estimate model parameters for arbitrary training sample orders. Next, we apply our framework to two downstream research problems: (1) Training curriculum design for LLMs -- we base our retraining-free framework to propose a novel curriculum learning strategy that augments curriculum proposals with estimated model performances, enabling more informed sample scheduling. (2) LLMs' memorization and generalization effect analysis -- we use our retraining-free framework to estimate how the positions of training samples influence LLMs' capacity for memorization and generalization. We conduct extensive experiments to validate the effectiveness of our retraining-free framework in reproducing the true model performances, and further demonstrate its potential in optimizing LLM training curricula and analyzing the memorization and generalization effects of LLMs.

Figures

Figures reproduced from arXiv: 2505.22042 by the authors.

Figure 1
Figure 1. Overview of the FUT framework. FUT operates in three stages: Stage 1: Compute the reference trajectory Θ = {θt} T t=0 using a fixed data order r. Stage 2: Store update and gradient terms for all (θt, Blt ) pairs, compressing them via random projection. Stage 3: Estimate trajectories {γ ki t } T t=0 under permuted data orders {ki} N i=1 using first-order Taylor expansion based on stored terms. A toy example along the… view at source ↗
Figure 2
Figure 2. Time cost comparison. In our experiments, assuming the dataset consists of T batches, we randomly select N training orders from the total of T! possible permutations. For each selected order, we use our method to estimate the model performance rˆ and also train the LLM using that order to obtain the ground-truth performance r. The performance gap is then calculated as: AbsDiff = 1 N X N k=1 |rˆk − rk|, where k index… view at source ↗
Figure 3
Figure 3. Memorization effects. Heatmaps in (a) and (b) are estimated by our FUT and FUT++ [PITH_FULL_IMAGE:figures/full_fig_p008_3.png] view at source ↗
Figures from the paper (3 more)
Figure 4
Figure 4. Figure 4: The generalization effect of batch Bi on dataset D, with sim(Bi , D) >= τ . 0 1 2 3 4 5 6 7 Position 1.36 1.38 1.40 1.42 1.44 1.46 1.48 1.50 Perplexity Generalize B0 to D Real Values FUT FUT++ 0 1 2 3 4 5 6 7 Position 1.36 1.38 1.40 1.42 1.44 1.46 1.48 1.50 Perplexity …
Figure 6
Figure 6. Figure 6: Scalable estimation performance across model sizes. We evaluate the estimation accuracy of FUT and FUT++ across model scales {0.8B, 1.0B, 1.2B, 1.4B} under training batch numbers T = 8 (left) and T = 16 (right). FUT and FUT++ consistently outperform the Random baseline…
Figure 7
Figure 7. Figure 7: Perplexity estimation at intermediate training steps. We visualize the validation perplexity estimated by FUT and FUT++ compared to the real validation perplexity after each batch, for training schedules with T ∈ {8, 16, 32} total batches. FUT and FUT++ both closely fo…

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Pith tools

Reviewed August 7, 2026 · model on record in the stance chip above.