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REVIEW 4 major objections 4 minor 150 references

Reinforcement learning can directly train LLMs to generate self-explanations that faithfully reflect the factors actually driving their decisions, with the faithfulness correlation Phi-CCT rising from near zero to 0.664 in-distribution and

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

2026-08-01 08:29 UTC pith:PPJ5HAHN

load-bearing objection Novel RL-for-faithfulness result is worth referee time, but the stale-label confound and reporting inconsistencies keep it from being conclusive. the 4 major comments →

arxiv 2607.21090 v1 pith:PPJ5HAHN submitted 2026-07-23 cs.LG cs.AIcs.CL

Training Large Language Models for Self-Explanation Faithfulness

classification cs.LG cs.AIcs.CL
keywords self-explanation faithfulnesscounterfactual interventionsreinforcement learningPhi-CCTinfluence detectionmention alignmentlarge language modelsexplainability
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper argues that self-explanation faithfulness—whether a model's stated reasoning actually reflects the factors driving its decision—can be directly optimized rather than only measured. To do this, the authors turn the Phi-CCT faithfulness metric into a per-sample reinforcement-learning reward: a counterfactual prompt is created by inserting a single phrase, the insertion is labelled influential if the model's answer flips, and the model is rewarded when its explanation mentions exactly those influential insertions and omits the non-influential ones. They report that this RL procedure lifts Phi-CCT from near zero to 0.664 in-distribution and up to 0.691 on held-out tasks, while ordinary supervised fine-tuning teaches detection without verbalization. If correct, this gives a scalable training-time route to reducing unfaithful reasoning, since the reward is computed from the model's own behavior rather than from gold rationales.

Core claim

The central claim is that a model can be taught to disclose the factors that change its own decisions, and that this disclosure can be optimized directly with reinforcement learning. The operational definition of faithfulness is simple: for an inserted intervention Δ, influence is I=1{Y'≠Y} (the intervention flipped the decision), mention is M=1{Δ appears in the explanation Z'}, and a faithful explanation has M=I. The per-sample reward r=1{M⇔I} is aggregated into Phi-CCT = Corr(I,M) over a dataset. RL fine-tuning with this reward improved Phi-CCT from near zero to 0.664 for in-distribution data and to 0.691 for out-of-distribution tasks such as StrategyQA, while supervised fine-tuning improv

What carries the argument

The key object is the counterfactual probe: each training point is a factual prompt X paired with X'=X⊕Δ, and the reward r=1{M⇔I} is built from whether the inserted Δ flips the decision (I=1{Y'≠Y}) and whether the explanation mentions Δ (M). Because r is computed from the current model's generated explanations, it can be used as a per-sample reward in group-relative policy optimization (GRPO), with advantages normalized within a batch. The dataset-level evaluation uses Phi-CCT = Corr(I,M), which punishes both indiscriminate mentioning and indiscriminate silence, and class-balanced sampling prevents fixed strategies from earning high reward. This machinery is what lets a faithfulness metric,

Load-bearing premise

The load-bearing premise is that a single controlled insertion is the only causal difference between factual and counterfactual prompts, and that exact-token mention is a complete measure of disclosure; if either proxy fails, the reward is not actually measuring faithfulness, and because influence labels come from the frozen initial model, the policy can drift toward stale labels during training.

What would settle it

Resample influence labels from the current policy at every training step and compare Phi-CCT to the frozen-label variant; if the on-policy score falls to near zero, the frozen-label gains are mostly label drift. A second test is to replace exact-token mention detection with a paraphrase-aware detector and see whether trained models' Phi-CCT changes; if it rises sharply, the original metric was undervaluing genuine disclosure.

Watch this falsifier — get emailed when new claim-graph text bears on it.

If this is right

  • Self-explanations can be improved at training time without gold rationales or external judges, because the reward uses only the model's own decisions and its generated text.
  • Models trained this way can generalize the disclosure behavior to unseen datasets such as StrategyQA and ComVE, so the effect is not confined to the training distribution.
  • Deployment-time audits and oversight can use the same counterfactual probe: if an explanation omits an intervention that flips the model's decision, that omission is a detectable unfaithfulness signal.
  • Since RL training also improves influence introspection modestly, the learned disclosure rule appears to interact with the model's own detection ability rather than being a pure surface behavior.
  • The absence of increased overlap ratio or completion-length gaming indicates that faithfulness gains can be obtained without degenerate copying or silence collapse.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Because the influence labels are frozen from the initial model and not resampled, the cleanest next test is a fully on-policy version that recomputes I=1{Y'≠Y} from the current policy; the paper itself flags this. If the on-policy gain disappears, part of the reported Phi-CCT improvement would be label drift rather than improved disclosure.
  • Exact-token and morphological mention detection may undercount paraphrased references to an intervention; a paraphrase-tolerant mention detector would likely change both the measured scores and the cross-intervention transfer results.
  • The same reward design could be extended to multiple simultaneous interventions or to naturalistic paragraphs, where the assumption of a single controlled difference no longer holds; such an extension would test whether the mechanism scales beyond the paper's single-word and template-bias probes.
  • A broader multi-objective reward that also preserves task accuracy and calibration may be needed before training-time faithfulness can be used as a safety component, since the paper notes shortened explanations and possible calibration effects.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

4 major / 4 minor

Summary. The paper proposes an RL fine-tuning method that directly optimizes the faithfulness of LLM self-explanations. Faithfulness is operationalized through counterfactual interventions: for each prompt X and inserted intervention Δ, influence is I = 1{Y′ ≠ Y} and mention is M = 1{Δ mentioned in Z′}. The per-sample reward is r = 1{M ⇔ I}, trained with GRPO. Experiments on Llama3.1-8B and Qwen3-8B with random-word and user-bias interventions report large in-distribution Phi-CCT gains (up to 0.664) and OOD transfer (up to 0.691), and behavior analyses are used to argue against trivial reward hacking. The paper also distinguishes SFT-based influence introspection (detection) from RL-based disclosure.

Significance. If the central claim is established, this is a useful step toward directly training self-explanations to reflect a model's actual decision drivers, rather than only evaluating faithfulness at inference time. The paper has notable strengths: bootstrap CIs on the main metric, balanced datasets to prevent simple shortcut strategies, explicit behavioral checks for shortening and parroting, and an unusually candid discussion of the off-policy nature of the training labels. However, the load-bearing evidence is currently compromised by an internal inconsistency about whether evaluation labels are stale, and the main results section misreports the numbers in the appendix tables. The central claim—that RL teaches faithful disclosure rather than merely reward alignment to frozen labels—is defensible but not yet established.

major comments (4)
  1. [§4.2, §7, and the off-policy paragraph] The manuscript is internally inconsistent about the evaluation protocol. The §4.2 off-policy paragraph states that 'evaluation targets alignment with the trained model's current decisions,' while §7 ('Limitations') states that 'We train and evaluate faithfulness with respect to the original model's decisions y, y′ collected prior to training.' If the evaluation uses the original frozen decisions, then the reported Phi-CCT is not a measure of the trained model's faithfulness at all. If the evaluation uses the current decisions, then the acknowledged stale-label drift can inflate the reported gains: the model is rewarded for matching I computed at T0, and reported Phi-CCT may improve partly because the policy's decisions drift toward those stale labels. Either way, the current reporting does not establish the central claim. The paper must state the evaluation protocol precisely and, as a c
  2. [§4.2, RL training setup] The RL reward is computed on explanations generated after appending the counterfactual decision y′ to the counterfactual prompt x′, while the dataset construction in §4.1 and the evaluation protocol generate (y′, z′) jointly from x′. This train/eval conditioning gap gives the training policy access to the decision it must explain, which can encourage rationalization of a supplied answer rather than detection of influence. The paper should evaluate under matched conditions: either generate z′ without appending y′ during training, or append y′ during evaluation. Reporting both would clarify whether the learned disclosure transfers to the evaluation setting.
  3. [§5, first paragraph vs Tables 3 and 4] The main results section misreports the introspection results. It claims that SFT improves Llama3.1-8B on random insertions from -0.013 to 0.537, but Table 3(a) reports SFT-on-RI test correlation 0.114; the 0.536/0.537 figure is the RL Phi-CCT from Table 4(a). Similarly, the claimed Llama user-bias SFT value 0.664 is the RL Phi-CCT from Table 4(b); Table 3(b) reports 0.271. The numbers for Qwen also mix the two tables. Since the SFT-versus-RL contrast is a central contribution, the text must be corrected to match the tables, and the distinction between predicted-influence correlation (Table 3) and Phi-CCT (Table 4) must be maintained.
  4. [§3.1 and §5] Because the RL objective is a per-sample binary version of the same I/M agreement that Phi-CCT evaluates, a high Phi-CCT after RL is partly an optimization-success result, not an independent external validation. The paper should add a matched control, e.g., RL with a reward that is correlated with the intervention but not the exact M⇔I agreement (such as always-mention or always-silence), to show that the specific reward shape is what drives the behavioral change. The OOD and cross-intervention results already provide some evidence against pure reward hacking, but a control would make the causal claim much stronger.
minor comments (4)
  1. [Table 3] Several rows report identical train and test values (e.g., Llama base random-insertion -0.013 on both; Llama SFT-on-UB random-insertion 0.667; Llama SFT-on-RI user-bias 0.623). If train and test splits are actually the same for these conditions, state this explicitly; otherwise the duplication suggests an error.
  2. [§3.1 and notation] The reward is written as r = 1{M ⇐ ⇒ I}, which is typographically confusing. Use the standard indicator notation 1[M ⇔ I] or define the logical equivalence explicitly.
  3. [§5.2 and Figure 4] The behavioral claims—shortening for predicted negatives and absence of parroting—are based on visual inspection of Figure 4. Add effect sizes and significance tests or at least numeric summaries for the completion-length and overlap-ratio comparisons.
  4. [§1 and §5] The abstract and introduction describe the OOD result as 'reaching up to 0.691 on held-out tasks such as StrategyQA.' This number appears only for Qwen3-8B RL-on-UB on the combined OOD split; clarify that it is not a per-dataset StrategyQA figure and that OOD performance is not uniform across conditions.

Circularity Check

1 steps flagged

Mild definitional alignment between the RL reward and the Phi-CCT evaluation metric; no hidden circular derivation. The main flagged confound is an acknowledged off-policy staleness limitation, not a circularity.

specific steps
  1. self definitional [Section 3.1 (faithfulness definition, reward r=1{M⇔I}) and Section 5 (Phi-CCT results, e.g. 0.664)]
    "This sets up a training objective: a faithful self-explanation should mention Δ if and only if it influences the decision Y′. This is a proxy for Phi-CCT faithfulness metric (Siegel et al., 2025) defined as the correlation between influence and mention over an entire dataset: Phi-CCT= Corr(I,M). For our reward in RL training, we use a per-sample binary indicator of whether influence and mention agree: r=1{M ⇐ ⇒ I}."

    The evaluation metric Phi-CCT is the dataset-level correlation of the same binary I and M whose per-sample agreement r is the RL reward. Thus the headline in-distribution gain (e.g., 0.664 Phi-CCT) is, by construction, the result of training on a per-sample surrogate of the reported statistic; the metric is not an independent external check that 'faithful disclosure' improved. The construct validity of Corr(I,M) as faithfulness is inherited from the authors' own Phi-CCT/CCT papers and from the single-insertion causal model. The paper is transparent about this—'we bridge this gap by modifying existing faithfulness metrics into an RL training objective'—so this is a mild definitional alignment rather than a hidden tautology.

full rationale

The derivation is mostly self-contained: Phi-CCT is defined in the paper as Corr(I,M), and the RL reward is explicitly a per-sample binary version of that same agreement. This makes reward and evaluation aligned by construction, which is appropriate for a training objective but means the headline in-distribution number is not an independent validation of 'faithful disclosure'; I record that as a mild self-definitional step. The self-citations to Siegel et al. (2024; 2025) are not load-bearing in the logical sense because the metric is redefined in-text, and the method also builds on non-self work (Atanasova et al. 2023; Turpin et al. 2023). Independent evidence comes from held-out and OOD splits (Phi-CCT up to 0.691 on StrategyQA) and from behavioral analyses (completion length, overlap ratio), which are not part of the reward. The paper itself flags the most important confound: 'Reported Phi-CCT gains may therefore partly reflect the trained model's decisions drifting toward the stale labels, rather than purely improved disclosure.' That is an experimental-validity limitation—off-policy influence labels—not a circularity, because the reward does not use the evaluation outcome. Overall score 2 reflects the reward/evaluation alignment and reliance on the authors' own metric construct, without treating the derivation as equivalent to its inputs.

Axiom & Free-Parameter Ledger

0 free parameters · 6 axioms · 0 invented entities

No free parameters are fitted to the reported Phi-CCT values; the numbers come from empirical evaluation of trained checkpoints. The load-bearing premises are the intervention-based proxy for internal causation, exact-token mention as disclosure, and the off-policy staleness of influence labels. No new entities such as particles, forces, or hidden states are introduced.

axioms (6)
  • domain assumption I=1{Y'≠Y} measures the causal influence of intervention Δ on the model's decision.
    The paper treats the controlled insertion Δ as the only difference between X and X' and attributes any answer flip to Δ. Used to define the reward and as a proxy for Phi-CCT.
  • domain assumption M=1{Δ mentioned in Z'} via morphological matching measures faithful disclosure.
    The reward and evaluation count only exact or morphologically related mentions; paraphrases or synonyms count as non-mention. The paper acknowledges this can underestimate mention rates.
  • domain assumption Deterministic decoding (T=0) gives stable decisions suitable for counterfactual pairing.
    The method assumes that Y vs Y' flips are attributable to Δ and not to sampling noise, because generations are produced at temperature 0.
  • domain assumption r=1{M⇔I} is an adequate per-sample surrogate for dataset-level Phi-CCT correlation.
    The reward is the binary agreement indicator, while Phi-CCT is the correlation over the whole dataset. This is a design choice, not a derivation.
  • ad hoc to paper Stale influence labels from the frozen initial model remain informative during RL training.
    Explicitly flagged in §4.2 and Limitations: 'training reward and evaluation metric are measuring subtly different objects... Reported Phi-CCT gains may therefore partly reflect the trained model's decisions drifting toward the stale labels.' This is a load-bearing assumption the paper does not quantify.
  • domain assumption Balanced 50/50 influential/non-influential splits remove class-prior reward hacking.
    The paper deliberately constructs balanced splits so that static mention/silence strategies score zero correlation, meaning reported Phi-CCT values are conditional on a constructed distribution rather than natural intervention frequency.

pith-pipeline@v1.3.0-alltime-deepseek · 29444 in / 14118 out tokens · 135053 ms · 2026-08-01T08:29:21.896778+00:00 · methodology

0 comments
read the original abstract

We propose a Reinforcement Learning (RL) method to directly optimize the faithfulness of self-explanations - the extent to which a model's generated reasoning accurately reflects its internal decision-making process. While existing work focuses on evaluating faithfulness or using inference-time prompting frameworks to improve an LLM's self-explanation's tractability, these approaches do not provide a mechanism to directly optimize a model's parameters to generate faithful self-explanations. We bridge this gap by modifying existing faithfulness metrics into an RL training objective. We investigate (1) if models can be trained to accurately detect factors that affect their decisions, and (2) whether RL can directly optimize for the disclosure of these factors thereby improving LLM self-explanations' faithfulness. We experiment with two intervention types: random-word insertions and user-bias insertions, using a per-sample reward derived from the Phi-CCT correlation metric. RL fine-tuned Llama3.1-8B and Qwen3-8B show substantial improvements on the Phi-CCT faithfulness metric, with in-distribution scores rising from near-zero to as high as 0.664, and out-of-distribution scores reaching up to 0.691 on held-out tasks such as StrategyQA. Cross-intervention generalization is weaker but more interesting: a priori we would not expect a model trained only on random word insertions to generalize to user-bias phrases, yet Llama3.1-8B shows non-zero transfer in this direction. The reverse direction and Qwen3-8B do not replicate this, indicating model-dependent and setup-dependent effects we cannot yet explain. Lastly we analyze model behavior to rule out reward gaming behaviors that often plague RL training. Ultimately, we show that models can be trained to implicitly identify influential factors and disclose them, offering a scalable path toward reducing unfaithful reasoning in LLMs.

Figures

Figures reproduced from arXiv: 2607.21090 by Mar\'ia P\'erez-Ortiz, Noah Y. Siegel, Oana-Maria Camburu, Yeoktatt Cheah.

Figure 1
Figure 1. Figure 1: Comparison of causal paths. In (a), the path [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Workflow of our RL training framework for improving faithfulness of self-explanations. [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Models trained on Influence Introspection via SFT and models trained with Mention [PITH_FULL_IMAGE:figures/full_fig_p008_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Analysis of models trained on Influence Introspection (SFT) and Mention Alignment (RL). [PITH_FULL_IMAGE:figures/full_fig_p009_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Confusion matrices for all Llama3.1-8B-Instruct model variants evaluated on influence [PITH_FULL_IMAGE:figures/full_fig_p020_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Confusion matrices for all Qwen3-8B model variants evaluated on influence introspec [PITH_FULL_IMAGE:figures/full_fig_p021_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Confusion matrices of Llama3.1-8B-Instruct RL models evaluated on the influence [PITH_FULL_IMAGE:figures/full_fig_p022_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Confusion matrices of Qwen3-8B RL models evaluated on the influence-disclosure align [PITH_FULL_IMAGE:figures/full_fig_p023_8.png] view at source ↗

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