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REVIEW 4 major objections 8 minor 3 cited by

An Analysis for Reasoning Bias of Language Models with Small Initialization

T0 review · 4 major / 8 minor · reviewed 2026-08-09 · deepseek-v4-flash

Pith's one-line read The scale of a transformer's weight initialization decides, in one training run, whether it learns compositional rules and generalizes or memorizes its training pairs; early embedding updates are shaped by token label distributions.

desk verdict Useful mechanism story for a known empirical result; the theory is suggestive rather than proven in the tested regime, but the paper deserves a careful referee. read the letter →

arxiv 2502.04375 v2 pith:KLUVLCAP submitted 2025-02-05 cs.CL cs.LG

classification cs.CLcs.LG MSC 68T0768T50
keywords initializationscalereasoningvsmemorizationembeddingdynamicstraininganchorfunctionsself-attentionlanguagemodelscompositionalgeneralization
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

This paper claims that the scale of a transformer's parameter initialization is not a neutral training detail: smaller scales nudge the model toward learning compositional reasoning rules, while larger scales nudge it toward memorizing input–output pairs. In a single next-token prediction run over a mixed dataset, a small-initialized model fits reasoning sequences faster and generalizes to unseen reasoning combinations, whereas a large-initialized model fits the memory part but shows no generalization. The reason, the authors argue, is early embedding dynamics: each token's embedding moves along a gradient determined by the label distribution of the samples containing that token. Reasoning anchors have anchor-dependent label distributions, so their embeddings differentiate quickly and form an ordered geometry; memory anchors share one uniform distribution, so their embeddings stay similar and the memory task stays hard. The claim is supported by synthetic composition tasks, a simplified embedding-plus-MLP model, a gradient-flow theory, and GPT-2 runs on real language data.

What carries the argument

The load-bearing object is the early-time gradient flow of the embedding row $w_{\mathrm{emb},s}$, which under small initialization becomes $d w_{\mathrm{emb},s}/dt = r_s (P_s - \frac{1}{d}\mathbf{1})\tilde W$ (Propositions 1–3), where $P_s$ is the label distribution of the samples containing token $s$ and $\tilde W$ collects the effective value/output and feedforward paths. The argument hangs on the contrast between (7) and (8): every memory anchor has the same uniform label distribution, while each reasoning anchor has a shifted distribution, so the same gradient law differentiates reasoning embeddings and leaves memory embeddings similar. Theorem 1 then approximates the reasoning-anchor embedding by a Gaussian bump $e^{-(i-s)^2/(2\sigma_P)}$, and the first attention module is shown to act as a fixed average operator whose value projection is dominated by reasoning anchors, carrying the differentiated signal forward.

What would settle it

Track the norm of the attention-matrix derivative $\|dA/dt\|$ against the embedding-gradient norm $\|dw_{\mathrm{emb}}/dt\|$ during the first 200 epochs of the synthetic task at $\gamma = 0.8$; if attention gradients are not comparatively small, the frozen-attention premise fails. Alternatively, relabel the reasoning task so that every reasoning anchor has the same label distribution as every other anchor; if the reasoning bias persists under small initialization, the label-distribution mechanism is not the whole story.

Watch

Extended reading notes

Core claim

On the paper's own terms, the discovery is that smaller initialization scales bias language models toward reasoning tasks and larger scales bias them toward memorization, and that the bias is governed by how label distributions shape the embedding space during the earliest training steps. Formally, with small initialization ($\gamma > 0.5$ in the paper's scheme, where weights are drawn as $N(0, d^{-2\gamma})$), the attention matrix of the first layer acts like an averaging operator, and the gradient flow of a token's embedding $w_{\mathrm{emb},s}$ reduces to $d w_{\mathrm{emb},s}/dt = r_s (P_s - \frac{1}{d}\mathbf{1})\tilde{W}$, with $P_s$ the label distribution over samples containing $s$. Because $P_s$ is the same uniform distribution for every memory anchor but shifts with the anchor value for reasoning anchors, reasoning embeddings separate early and acquire a hierarchical, number-ordered structure, while memory embeddings remain undifferentiated. Theorem 1 approximates the resulting reasoning-anchor embeddings by $e^{-(i-s)^2/(2\sigma_P)}$ and bounds the inner-product error. The value projection $W^V$ of the first attention block develops a dominant singular direction aligned with reasoning anchors, so the reasoning signal propagates to all subsequent tokens, whereas memory anchors are not distinctly captured.

Load-bearing premise

Everything in the theoretical explanation depends on treating the attention matrix as a fixed averaging operator during early training and ignoring the gradients of the attention weights; if those gradients are not actually small in the window where the bias forms, the mechanism is incomplete.

Editorial extensions

If this is right

  • Initialization scale becomes a practical control knob: with $\gamma > 0.5$ a small transformer on a mixed reasoning/memory dataset will preferentially learn and generalize the reasoning part, while $\gamma < 0.5$ makes it memorize the training pairs instead.
  • The reasoning bias is not about the model's capacity or the data's complexity but about early embedding differentiation, so tasks whose per-token label distributions are structured inherit the bias automatically.
  • Memory-style tasks can be made learnable even as arbitrary mappings if their label distributions vary with the anchor: the paper shows that an anchor-dependent memory task is learned faster than a fully uniform one.
  • Real pretraining may inherit the same effect: in GPT-2 runs on PrOntoQA plus TinyStories, the loss advantage of the reasoning dataset grows as the initialization scale shrinks, and the reasoning-token embeddings become more distinguishable.
  • Under small initialization, the first attention block's value projection aligns with reasoning anchors while the attention matrix stays near an average operator, giving a concrete internal signature that distinguishes a reasoning-biased run from a memorizing one.

Reading between the lines

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

  • An untested implication is that the bias generalizes beyond arithmetic: any per-token label structure that encodes an ordering or a rule, such as dates, coordinates, or hierarchical codes, should benefit from small initialization, while flat, arbitrary fact associations should be chronically disfavored.
  • As an extension not explored in the paper, one could deliberately engineer label-distribution diversity for key tokens through auxiliary objectives or embedding regularization to induce reasoning-like generalization without shrinking the initialization scale.
  • The frozen-attention window may be a narrow early-training phase; at larger widths, deeper stacks, or with aggressive learning-rate schedules, attention gradients could become significant before the embedding geometry sets, which would make the bias a small-model, early-training phenomenon rather than a universal LLM property.
  • A testable extension: after a small-initialization pretraining phase that has already differentiated reasoning embeddings, introducing a fresh memory-style task should proceed slowly; if correct, task order should interact with the bias.
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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 / 8 minor

Summary. The paper studies how the parameter initialization scale of a Transformer affects whether the model learns compositional reasoning mappings or memorizes input–output pairs. In a synthetic anchor-function task and in a GPT-2 experiment mixing PrOntoQA and TinyStories, the authors report that a smaller initialization scale (γ=0.8) favors reasoning, while a larger scale (γ=0.3) favors memorization. They propose a mechanism in which early embedding gradients are driven by the label distribution of each token: memory anchors have uniform label distributions and thus undifferentiated embeddings, whereas reasoning anchors have anchor-dependent label distributions and thus develop a hierarchical embedding structure. The paper formalizes this with an Embedding-MLP analysis (Proposition 1), a one-layer Transformer gradient-flow analysis (Propositions 2–3, Theorem 1), and an analysis of the first and second attention modules, and it validates the qualitative embedding patterns against experiments.

Significance. If the empirical finding holds, initialization scale is an easily controllable training bias that determines whether a small Transformer learns a compositional rule and generalizes or simply memorizes training data. The synthetic task is carefully designed, the empirical direction is consistent across the Transformer, Emb-MLP, and GPT-2 settings, and the paper offers a concrete, testable mechanism based on label distributions. The theoretical framework, however, is not yet on solid ground: the Transformer gradient-flow derivation neglects derivatives through the attention weights, Lemma 1 holds provably only for initialization scales much larger than those tested, and the validation of Theorem 1 fixes Gaussian width and normalization by hand. The empirical contribution is valuable, but the claimed explanatory mechanism requires additional analysis.

major comments (4)
  1. [§3.3 / Appendix B.5, Lemma 3] The gradient-flow derivation for the one-layer Transformer differentiates fθ with respect to W_emb only through the value and residual paths, treating the attention matrix A as a fixed average operator. Since A = softmax(mask(QK^T)/√dk) depends on W_emb through Q and K, the omitted dA term is generically nonzero, and the paper does not bound it. Propositions 2 and 3 and Theorem 1 therefore do not yet establish that label distributions alone drive the early embedding differentiation in an actual Transformer. I recommend either deriving a bound on the dA contribution during the early-training window or adding a numerical comparison of the retained versus omitted gradient terms.
  2. [Lemma 1 / §3.3] The regime in which A is provably near the average operator is not the regime tested in the experiments. With d_m=200, d_k=64, ε=δ=0.1, the proof of Lemma 1 requires γ ≳ 2.8, while all experiments use γ=0.3, 0.5, and 0.8. Figure 6 shows the average-operator behavior for γ=0.8 only at epoch 200, which is after the early window in which the embedding differentiation is claimed to occur. The theoretical mechanism is therefore not verified for the experimental setting; please extend the lemma to the tested range, justify the extrapolation, or present experiments in the provable regime.
  3. [Theorem 1 / Eq. (14) / Appendix B.7] The validation of Theorem 1 fixes the Gaussian width and normalization in Eq. (14) by hand, and the stated error bound (13) yields O(d_m^{1-γ}(q^{-1/2}+d_m^{-γ})) ≈ O(2.4) for the experimental values (d_m=200, γ=0.8, q=2), which is too loose to certify the cosine-similarity match shown in Figure 5C. The visual agreement could therefore be sensitive to the hand-set constants; a principled estimate of C1, C2, and σP or a quantitative error metric is needed to substantiate the theoretical validation.
  4. [§3.1–§3.4, all figures] All reported experiments appear to be single runs without error bars or multiple seeds. Since the central empirical claim is a comparison of learning speeds and generalization behaviors across γ values, the observed differences could in principle be within run-to-run variability. Please report the number of seeds and the variance of the loss, accuracy, and cosine-similarity measures, or otherwise justify that the effects are stable.
minor comments (8)
  1. [§2.3, Eq. (2)] The masking operation mask(·) is used without definition; please specify the causal mask explicitly.
  2. [§3.1 / §2.2] The relationship between the 'last token prediction' described in §3.1 and the label construction defined in §2.2 should be stated explicitly, since the dataset definition refers to the label of the full sequence.
  3. [§3.5] The notation '{30, ..., 29 + 20 × i}' for the four label-range groups is confusing; the intended ranges (e.g., 30–49, 30–69, 30–89, 30–109) should be written out.
  4. [Appendix E, Assumption 4] The sign convention in cos(w_pos,i, w_pos,j) = cos(|i−j|π/L) should be checked against the increasing attention pattern in Figure 15C; if the cosine is negative for large |i−j|, the stated increasing behavior requires clarification.
  5. [Theorem 2] Theorem 2 assumes N_Z = d_m, which is not satisfied in the experiments (N_Z=100, d_m=200); the paper should state clearly that this result is not directly validated by the reported experiments.
  6. [§2.2 / §3.2] Equations (7) and (8) are immediate consequences of the dataset construction: memory labels are uniform by definition and reasoning labels are sums of keys and anchors by definition. The authors should state this explicitly so that the empirical content is understood to lie in the dynamical response of the embeddings to these distributions.
  7. [Throughout] The paper does not mention whether code and data will be released; an availability statement would improve reproducibility.
  8. [Figure 4 and Appendix B.5] There are several typesetting issues, such as 'P s − 1 dvob 1' in Figure 4B and the phrase 'as the initialization scales decrease to zero' in Appendix B.5, which conflicts with the γ→∞ limit used in Propositions 2–3; please proofread these passages.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the synthetic label distributions are definitions, the empirical loss and embedding results are measured, and the self-citations are background rather than load-bearing.

full rationale

The claimed derivation chain is: (i) the synthetic benchmark defines memory labels as uniform draws from Z and reasoning labels as sums of the key and anchors, which yields the label distributions in Eqs. (7)-(8); (ii) Proposition 1 and the small-initialization limit express the embedding gradient as proportional to P_s minus a uniform vector; (iii) Propositions 2-3 specialize this gradient flow to memory and reasoning anchors; and (iv) the predicted embedding differentiation is compared with measured cosine-similarity matrices, while the reasoning bias itself is read from independently measured loss curves on Dmem, Drsn,train, Drsn,test and on the external PrOntoQA and TinyStories corpora. Equations (7)-(8) are statements of the data-generation process, not fitted predictions, so the fact that reasoning anchors have s-dependent label distributions is a definitional input rather than a circular output. The empirical claims could have failed (for example, a larger initialization could have ignored the label structure), and Figures 3, 5, and 7 report measured quantities. The main theoretical weakness is the frozen-attention approximation in Lemma 3 and Appendix B.5, which omits derivatives of the attention matrix, together with the regime mismatch between Lemma 1's asymptotic guarantee and the tested gamma=0.8; these are rigor and correctness concerns, not circularity. The self-citations (Zhang et al. 2024a,b; Xu et al. 2025; Chen et al. 2024) motivate the anchor-function framework and condensation intuition, but they are not the load-bearing proof because the paper re-derives its gradient-flow results and validates them on external benchmarks. Therefore no load-bearing step reduces by construction to its own input.

Assumptions & free parameters 1 free parameters · 7 assumptions · 0 invented entities

The central derivation uses a linearized gradient-flow model of the embedding layer, valid only in the limit of infinitesimal initialization and infinite data. It relies on the specific construction of the anchor-function tasks, and the main quantitative check fixes a Gaussian width by hand. The frozen-attention assumption is the largest unstated simplification.

free parameters (1)
  • Gaussian width and normalization in Theorem 1 = sigma_P^2 = 6 (exponent (i-s)^2/12), C1*C2 = 1 in Eq. (14)
    Theorem 1's ~w^s uses unspecified C1, C2, sigma_P. The validation in Eq. (14) sets them by hand to e^{-(i-s)^2/12}, so the later cosine-similarity match is a fit, not a prediction.
assumptions (7)
  • standard math Assumption 1: activation sigma is C^2 with bounded first and second derivatives, sigma(0)=0, sigma'(0)=1.
    Used to linearize the network at small initialization so that sigma' = 1 and softmax = uniform. Standard smoothness assumption, but real transformers use activations that are not exactly linear at initialization.
  • ad hoc to paper The attention matrix A is treated as constant when deriving the embedding gradient in the one-layer Transformer (Lemma 3).
    Lemma 3 in Appendix B.5 differentiates only the direct W_emb terms and treats the attention matrix as fixed; no bound is given for the neglected derivative of the attention weights.
  • domain assumption The limits n -> infinity and gamma -> infinity are taken simultaneously with r_s constant.
    Propositions 1, 2, 3 replace empirical label frequencies by their expectations and activations by their linear limit. This is an infinite-data, infinitesimal-init idealization that may not hold over the full training window.
  • standard math The discrete sum of uniform random variables is approximated by a Gaussian via Berry-Esseen (Theorem 1).
    Used to justify the Gaussian bump form of ~w^s; the stated error O(q^{-1/2}) follows from CLT but the constants in the approximation remain unset.
  • domain assumption Task construction: memory labels are uniform over Z independent of the anchor, reasoning labels are the sum of the key and anchors (Eqs. 7 and 8).
    These definitions directly imply that memory anchors share a label distribution while reasoning anchors have anchor-dependent distributions. The differentiated label structure is enforced by the benchmark design, not learned.
  • ad hoc to paper Word embeddings and position embeddings are orthogonal and position-position cosine follows cos(|i-j| pi / L) (Assumptions 2-4, Appendix E).
    Used to build the cliff-sequence reconstruction of the second attention module; these are idealized assumptions not verified in the trained models.
  • ad hoc to paper Theorem 2 assumes NZ = dm and a 1:1 ratio of memory to reasoning mappings.
    This special constrained condition is explicitly conceded in Appendix B.8 to be a limitation of the general explanation for the W^V preference.

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Cite this review

Pith. "Pith review of An Analysis for Reasoning Bias of Language Models with Small Initialization." pith.science (2026). https://pith.science/paper/KLUVLCAP

@misc{pith2026250204375,
  author       = {Pith},
  title        = {Pith review of: An Analysis for Reasoning Bias of Language Models with Small Initialization},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/KLUVLCAP}},
  note         = {Machine review of arXiv:2502.04375}
}
read the original abstract

Transformer-based Large Language Models (LLMs) have revolutionized Natural Language Processing by demonstrating exceptional performance across diverse tasks. This study investigates the impact of the parameter initialization scale on the training behavior and task preferences of LLMs. We discover that smaller initialization scales encourage models to favor reasoning tasks, whereas larger initialization scales lead to a preference for memorization tasks. We validate this reasoning bias via real datasets and meticulously designed anchor functions. Further analysis of initial training dynamics suggests that specific model components, particularly the embedding space and self-attention mechanisms, play pivotal roles in shaping these learning biases. We provide a theoretical framework from the perspective of model training dynamics to explain these phenomena. Additionally, experiments on real-world language tasks corroborate our theoretical insights. This work enhances our understanding of how initialization strategies influence LLM performance on reasoning tasks and offers valuable guidelines for training models.

Figures

Figures reproduced from arXiv: 2502.04375 by the authors.

Figure 1
Figure 1. Comparison of training loss between PrOntoQA and TinyStories in one next-token prediction training for this mix dataset. The red line represents the training loss on the PrOn￾toQA dataset, while the blue line depicts the training loss on the TinyStories dataset. wide range of tasks, from text generation to complex reason￾ing (Wei et al., 2022a; Achiam et al., 2023; Liu et al., 2024). Reasoning, in particular, is a c… view at source ↗
Figure 2
Figure 2. Schematic diagram of the synthetic composition task. The gray-shaded area illustrates the specific setup used in this example. Each block represents a token within the input sequence, with different face colors indicating distinct token types (blue: noise, orange: key, green: anchor). Each row corresponds to an input sequence paired with its respective label. The left section depicts four examples of memory mapping,… view at source ↗
Figure 3
Figure 3. A: Loss and prediction accuracy of the models on different datasets under varying initialization scales (γ = 0.3, 0.5, 0.8). The top row depicts the evolution of the loss during training for three datasets: Dmem (blue lines), Drsn,train (purple lines), and Drsn,test (orange lines). The bottom row presents the corresponding prediction accuracies for these datasets. Each column represents results obtained with differe… view at source ↗
Figures from the paper (14 more)
Figure 4
Figure 4. Figure 4: A: Cosine similarity matrices for memory (top row) and reasoning (bottom row) anchors at epoch 50 (left) and epoch 900 (right) of a model initialized with γ = 0.8. B: Distribution of P s − 1 dvob 1 for different reasoning anchor s. C: Cosine similarity between P si − 1…
Figure 5
Figure 5. Figure 5: Embedding structure of a Transformer model with small initialization scale. A: Cosine similarity matrices for memory (top) and reasoning (bottom) anchors at epoch 200 (left) and epoch 900 (right). B: Visualization of the embedding space projected onto the first two pri…
Figure 6
Figure 6. Figure 6: Characteristics of the first attention module under small initialization (γ = 0.8) in the early training stage (epoch 200). A: Heatmap of the attention matrix for a random sample. B: Distribution of the relative error between attention Ajk and 1 j across all training s…
Figure 7
Figure 7. Figure 7: Reasoning bias of GPT-2 in real language tasks. A: dynamics of ∆L during early training stage with initializations scales γ = 0.3, 0.5 and 0.8. B: Cosine similarity among embedding space of PrOntoQA dataset and TinyStories dataset at step 5000 with γ = 0.8. detailed fo…
Figure 8
Figure 8. Figure 8: Left: Distribution of targets and predictions in 4 groups of memory tasks. Red represents the target distribution in each group and blue represents the prediction distribution. Right: Learn￾ing speed comparison for Fmem,1 (red) and Fmem,2 (blue). Previous sections reve…
Figure 9
Figure 9. Figure 9: Cosine similarity comparison between experimental results cos wemb,si , wemb,sj  with theoretical approximations cos w˜ emb,si , w˜ emb,sj  (see (12)), for any si, sj ∈ Arsn. Theorem 2. Let n, γ → ∞, NZ = dm, Define that A ∼ U (Arsn) and Y as a random variable which …
Figure 10
Figure 10. Figure 10: exhibits the cosine similarity within the embedding space of Emb-MLP models with initialization rates γ = 0.3 and γ = 0.5. The results indicate that under a large initialization scale, the embedding space of the model becomes less influenced by the label distributions…
Figure 11
Figure 11. Figure 11: Characteristic of embedding space of Transformer with initialization rates γ = 0.3, 0.5. The left and middle panels depict the cosine similarity among embedding vectors of memory anchors and reasoning anchors at epochs 200 and 900. The right panel shows a PCA projecti…
Figure 12
Figure 12. Figure 12: Characteristics of the first attention module of Transformers (step 200) with initialization rates γ = 0.3 (top row) and γ = 0.5 (bottom row). A: Heatmap of the attention matrix for a random sample. B: Distribution of the relative error between attention Ajk and 1 j a…
Figure 13
Figure 13. Figure 13: The distribution of singular value in different parameter matrices under different initialization scales (step 200). We denote the singular value vector by S and the i-th largest singular value by si. 25 [PITH_FULL_IMAGE:figures/full_fig_p025_13.png]
Figure 14
Figure 14. Figure 14: exhibits the cosine similarity within the embedding space of PrOntoQA and TinyStories tasks trained by GPT-2 models with initialization rates γ = 0.3 and γ = 0.5. It’s noted that under a large initialization scale, the embedding vectors are mutually orthogonal, indica…
Figure 15
Figure 15. Figure 15: Characteristic of the second attention module. A: The last row of the second attention matrix (without applying softmax) for a randomly selected sequence. B: A heatmap of the second attention matrix for the same sequence. C: The last row of the matrix QWposWK/ √ dk im…
Figure 16
Figure 16. Figure 16: Training dynamics of Transformers under γ = 0.3, 0.5, 0.8 without Layer Normalization. G. Learning Rate We conduct experiments with the learning rate belonging to 10−5 , 5 × 10−4 [PITH_FULL_IMAGE:figures/full_fig_p030_16.png]
Figure 17
Figure 17. Figure 17: Training dynamics of Transformers under γ = 0.3, 0.5, 0.8 and varying learning rates. 31 [PITH_FULL_IMAGE:figures/full_fig_p031_17.png]

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    " write newline "" before.all 'output.state := FUNCTION n.dashify 't := "" t empty not t #1 #1 substring "-" = t #1 #2 substring "--" = not "--" * t #2 global.max substring 't := t #1 #1 substring "-" = "-" * t #2 global.max substring 't := while if t #1 #1 substring * t #2 gl...

Pith tools

Reviewed August 9, 2026 · model on record in the stance chip above.