Reconciling Contradictory Views on the Effectiveness of SFT in LLMs: An Interaction Perspective
Pith reviewed 2026-05-20 10:00 UTC · model grok-4.3
The pith
Supervised fine-tuning primarily removes noise-like interactions in large language models rather than acquiring new reliable ones, with the beneficial phase being very short.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
We find that SFT primarily removes noise-like interactions, while rarely acquiring reliable new interactions. This denoising stage is extremely brief, after which continued fine-tuning tends to introduce overfitted interactions.
What carries the argument
The evolution of interactions between words or tokens during supervised fine-tuning, serving as a metric for inference patterns in LLMs.
If this is right
- The denoising effect of SFT occurs rapidly and is followed by overfitting if training continues.
- Early stopping can be used to maximize the benefits of SFT while avoiding detrimental overfitted interactions.
- SFT is effective for LLMs mainly by cleaning up noise rather than by adding new capabilities.
- These patterns hold across different LLMs and fine-tuning datasets.
Where Pith is reading between the lines
- Interaction tracking could be extended to other fine-tuning techniques to identify optimal stopping points.
- This view might reconcile similar inconsistencies seen in other large-scale training methods.
- It implies that most reliable inference patterns are set during pre-training, with SFT serving a limited cleanup role.
Load-bearing premise
Interactions between tokens provide a faithful way to measure the inference patterns learned by large language models.
What would settle it
Count the number of noise-like and reliable interactions at successive stages of SFT and verify if performance improves only in the initial short phase before declining with added overfitted interactions.
Figures
read the original abstract
This paper explores a scientific question in supervised fine-tuning (SFT): why SFT is broadly effective for small-scale deep neural networks, yet can produce inconsistent or even detrimental effects when applied to large language models (LLMs). Recent advances in interaction-based explanations suggest that interactions between words/tokens provide a faithful metric for quantifying the inference patterns encoded by LLMs. We find that the evolution of interactions during SFT can effectively explain the inconsistent effectiveness of SFT for LLMs. Specifically, we find that (1) SFT primarily removes noise-like interactions, while rarely acquiring reliable new interactions. (2) This denoising stage is extremely brief, after which continued fine-tuning tends to introduce overfitted interactions. We validate these findings across multiple LLMs and datasets. Our findings provide new insights into early stopping and offer practical guidance for LLM training.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript claims that inconsistent effectiveness of supervised fine-tuning (SFT) on LLMs versus small networks can be reconciled by tracking token interactions: SFT briefly removes noise-like interactions without acquiring reliable new ones, after which continued training introduces overfitted interactions; this is validated across multiple LLMs and datasets and yields guidance on early stopping.
Significance. If the interaction metric is shown to faithfully track inference patterns and causally explain SFT outcomes, the work could reconcile contradictory SFT results and supply concrete training heuristics. The approach is novel in applying interaction dynamics to the SFT puzzle, but its significance is limited by the absence of direct links between observed interaction changes and downstream task performance.
major comments (2)
- [Abstract and §4] Abstract and §4 (Experiments): the claim of validation 'across multiple LLMs and datasets' is stated without reporting controls, baseline comparisons, or the exact procedure for quantifying and classifying interactions as 'noise-like' versus 'overfitted'; this omission makes it impossible to assess whether the denoising-then-overfitting trajectory is robust or merely descriptive of the chosen metric.
- [§2 and §3] §2 (Interaction Metric) and §3 (Evolution Analysis): the central explanatory claim requires that changes in the interaction measure directly account for SFT effectiveness, yet no ablation, held-out prediction test, or alignment with known spurious/causal features is reported; without such evidence the narrative risks being a post-hoc description of metric dynamics rather than a causal account.
minor comments (2)
- [§2] Define 'noise-like' and 'overfitted' interactions with explicit mathematical criteria or thresholds rather than qualitative description.
- [§4] Add a table or figure caption clarifying the precise LLMs, datasets, and interaction-extraction method used in the validation.
Simulated Author's Rebuttal
We thank the referee for their constructive comments, which have helped us improve the clarity and rigor of our work. Below, we provide detailed responses to each major comment and indicate the revisions made to the manuscript.
read point-by-point responses
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Referee: [Abstract and §4] Abstract and §4 (Experiments): the claim of validation 'across multiple LLMs and datasets' is stated without reporting controls, baseline comparisons, or the exact procedure for quantifying and classifying interactions as 'noise-like' versus 'overfitted'; this omission makes it impossible to assess whether the denoising-then-overfitting trajectory is robust or merely descriptive of the chosen metric.
Authors: We agree that additional details on the experimental procedure are necessary to allow readers to assess robustness. In the revised manuscript, we have expanded §4 with a dedicated subsection describing the exact quantification of interactions (including the mathematical definition and computation steps), the classification criteria for noise-like interactions (those whose removal improves validation performance without harming training) versus overfitted ones (those that boost training but degrade held-out performance), and the specific thresholds applied. We have also added baseline comparisons using randomly permuted token interactions and controls varying random seeds and hyperparameter settings across the reported LLMs and datasets. These revisions should enable a clearer evaluation of whether the observed trajectory is robust. revision: yes
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Referee: [§2 and §3] §2 (Interaction Metric) and §3 (Evolution Analysis): the central explanatory claim requires that changes in the interaction measure directly account for SFT effectiveness, yet no ablation, held-out prediction test, or alignment with known spurious/causal features is reported; without such evidence the narrative risks being a post-hoc description of metric dynamics rather than a causal account.
Authors: We acknowledge that stronger evidence linking interaction changes directly to SFT outcomes would better support the causal narrative. The original §3 presents consistent temporal alignments between interaction evolution and performance shifts, but we agree that ablations and held-out tests were not included. In the revision, we have added a held-out prediction experiment in §3 that uses early interaction changes to forecast later SFT effectiveness and compares predictions against observed results. We have also included a brief alignment analysis with known spurious features in one dataset. Full causal interventions remain challenging due to scale, so we have noted this limitation and suggested it as future work. This constitutes a partial but substantive improvement to the explanatory section. revision: partial
Circularity Check
No significant circularity; derivation relies on external interaction metric and empirical observations.
full rationale
The paper treats interactions between tokens as a pre-existing explanatory tool drawn from recent advances in interaction-based explanations, then tracks their evolution empirically across SFT stages on multiple LLMs and datasets. No equation or claim reduces the observed denoising/overfitting pattern to a definition or fit that is constructed from the target SFT-effectiveness conclusion itself. The central narrative is presented as an interpretation of measured changes rather than a self-referential loop, and the validation steps are independent of the interpretive framing.
Axiom & Free-Parameter Ledger
axioms (1)
- domain assumption Interactions between words/tokens provide a faithful metric for quantifying the inference patterns encoded by LLMs.
Lean theorems connected to this paper
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IndisputableMonolith/Cost/FunctionalEquation.leanwashburn_uniqueness_aczel unclear?
unclearRelation between the paper passage and the cited Recognition theorem.
interactions between words/tokens provide a faithful metric for quantifying the inference patterns encoded by LLMs... SFT primarily removes noise-like interactions
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IndisputableMonolith/Foundation/RealityFromDistinction.leanreality_from_one_distinction unclear?
unclearRelation between the paper passage and the cited Recognition theorem.
AND-OR interactions... universal matching property... ratio of uncancelled interaction effects ρ
What do these tags mean?
- matches
- The paper's claim is directly supported by a theorem in the formal canon.
- supports
- The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
- extends
- The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
- uses
- The paper appears to rely on the theorem as machinery.
- contradicts
- The paper's claim conflicts with a theorem or certificate in the canon.
- unclear
- Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.
Reference graph
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