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arxiv: 2604.21667 · v1 · submitted 2026-04-23 · 💻 cs.CL · cs.AI

Recognition: unknown

Fine-Grained Perspectives: Modeling Explanations with Annotator-Specific Rationales

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Pith reviewed 2026-05-09 21:24 UTC · model grok-4.3

classification 💻 cs.CL cs.AI
keywords annotator perspectivesexplanation modelingnatural language inferenceperspectivist modelingdisaggregated annotationsannotator rationalesfine-grained disagreementuser passport
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The pith

Jointly modeling annotator labels and their specific rationales improves predictive performance and captures fine-grained disagreement in NLI.

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

The paper establishes a framework that jointly predicts annotator-specific labels and generates corresponding explanations, conditioned on annotator identity and demographics. It demonstrates that adding explanation modeling to an annotator-aware classifier raises accuracy while producing rationales aligned with individual viewpoints. A reader would care because many annotation tasks show persistent disagreement that standard models dismiss as noise rather than treat as signal from distinct perspectives. The work introduces a User Passport for representation-level conditioning and compares two explainer designs that differ in how they link classifier outputs to generated text.

Core claim

Incorporating explanation modeling substantially improves predictive performance over a baseline annotator-aware classifier. The prefixed bridge explainer achieves more stable label alignment and higher semantic consistency, while the post-hoc explainer yields stronger lexical similarity. These results indicate that modeling explanations as expressions of fine-grained perspective provides a richer and more faithful representation of disagreement. The approaches advance perspectivist modeling by integrating annotator-specific rationales into both predictive and generative components.

What carries the argument

The User Passport mechanism conditions predictions on annotator identity and demographic metadata at the representation level, combined with a prefixed bridge explainer that transfers annotator-conditioned classifier representations directly into a generative model and a post-hoc prompt-based explainer.

If this is right

  • Predictive accuracy on annotator-specific labels rises when explanations are modeled jointly rather than treated as a separate task.
  • The prefixed bridge design produces explanations whose labels align more stably with the classifier output and show higher semantic consistency.
  • The post-hoc design generates explanations that match the lexical content of human rationales more closely.
  • Disagreement among annotators is represented more faithfully once rationales are treated as part of the modeling objective.
  • Perspectivist systems gain from embedding annotator rationales inside both the classification and generation pipelines.

Where Pith is reading between the lines

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

  • The same joint-modeling pattern could be applied to other subjective tasks such as toxicity detection or stance classification to test whether explanation conditioning reduces label variance.
  • Because the passport encodes demographic metadata, the approach might be extended to measure whether generated explanations surface demographic-specific reasoning patterns.
  • If the generated rationales prove reliable, they could serve as training signals for future annotators to reduce inconsistency across labeling rounds.

Load-bearing premise

Annotator-provided rationales are faithful and consistent expressions of individual perspectives that transfer into model representations without introducing misalignment or noise.

What would settle it

A controlled experiment on a fresh disaggregated NLI dataset in which adding either explainer architecture fails to raise predictive accuracy or produce measurable alignment gains between labels and generated explanations.

Figures

Figures reproduced from arXiv: 2604.21667 by Charles Welch, Daniel Braun, Olufunke O. Sarumi.

Figure 2
Figure 2. Figure 2: Prefixed Bridged Faithfulness Evaluation [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 1
Figure 1. Figure 1: The Prefixed Bridged Explainer with the instance representation at the feature level. Training uses masked binary cross-entropy with an auxiliary soft-label alignment objective ( λsoft = 1.0). Class imbalance is handled using masked focal BCE with class-specific positive weighting. For explanation generation, both explainer vari￾ants are trained using Flan-T5-base with a maxi￾mum input length 512 and targe… view at source ↗
Figure 4
Figure 4. Figure 4: The Prefixed Bridged Explanation Example [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: The Post-hoc Explanation Example L and Semantic similarity remain relatively low across both models. A closer examination of the VariErrNLI dataset (Weber-Genzel et al., 2024) provides important con￾text for interpreting these results. The dataset ex￾plicitly distinguishes between variation and anno￾tation error through a second round of self- and peer-validation, where explanations are assessed for whethe… view at source ↗
read the original abstract

Beyond exploring disaggregated labels for modeling perspectives, annotator rationales provide fine-grained signals of individual perspectives. In this work, we propose a framework for jointly modeling annotator-specific label prediction and corresponding explanations, fine-tuned on the annotators' provided rationales. Using a dataset with disaggregated natural language inference (NLI) annotations and annotator-provided explanations, we condition predictions on both annotator identity and demographic metadata through a representation-level User Passport mechanism. We further introduce two explainer architectures: a post-hoc prompt-based explainer and a prefixed bridge explainer that transfers annotator-conditioned classifier representations directly into a generative model. This design enables explanation generation aligned with individual annotator perspectives. Our results show that incorporating explanation modeling substantially improves predictive performance over a baseline annotator-aware classifier, with the prefixed bridge approach achieving more stable label alignment and higher semantic consistency, while the post-hoc approach yields stronger lexical similarity. These findings indicate that modeling explanations as expressions of fine-grained perspective provides a richer and more faithful representation of disagreement. The proposed approaches advance perspectivist modeling by integrating annotator-specific rationales into both predictive and generative components.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 1 minor

Summary. The paper proposes a framework for jointly modeling annotator-specific label prediction and explanation generation on disaggregated NLI data. It conditions both tasks on annotator identity and demographics via a representation-level User Passport mechanism and introduces two explainer architectures: a post-hoc prompt-based explainer and a prefixed bridge explainer that transfers annotator-conditioned classifier representations into a generative model. The central claim is that incorporating explanation modeling substantially improves predictive performance over a baseline annotator-aware classifier, with the prefixed bridge approach achieving more stable label alignment and higher semantic consistency while the post-hoc approach yields stronger lexical similarity; this is presented as advancing perspectivist modeling by treating rationales as fine-grained expressions of individual perspectives.

Significance. If the empirical gains and underlying assumptions hold, the work would meaningfully advance perspectivist NLP by showing how annotator rationales can be integrated into both predictive and generative components to better capture disagreement. The User Passport conditioning and the prefixed bridge transfer mechanism represent concrete architectural contributions that could generalize to other subjective annotation settings.

major comments (2)
  1. Abstract: the claim that 'incorporating explanation modeling substantially improves predictive performance over a baseline annotator-aware classifier' is load-bearing for the entire contribution, yet the abstract (and the provided text) supplies no quantitative metrics, statistical tests, dataset sizes, or ablation results to support the magnitude or reliability of the reported gains.
  2. Methods / Evaluation: the joint-modeling benefits rest on the assumption that annotator-provided rationales are faithful, consistent signals of individual perspectives that transfer cleanly into the User Passport representations; no per-annotator rationale-label alignment metrics, consistency checks, or noise analysis are described, leaving open the possibility that the prefixed bridge and post-hoc mechanisms propagate misalignment rather than enrich the conditioning.
minor comments (1)
  1. Abstract: the term 'User Passport mechanism' is used without a one-sentence definition or pointer to its prior introduction, which would aid readers unfamiliar with the conditioning technique.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their thoughtful and constructive feedback. We address each major comment below, agreeing where revisions are warranted and outlining specific changes to strengthen the manuscript.

read point-by-point responses
  1. Referee: Abstract: the claim that 'incorporating explanation modeling substantially improves predictive performance over a baseline annotator-aware classifier' is load-bearing for the entire contribution, yet the abstract (and the provided text) supplies no quantitative metrics, statistical tests, dataset sizes, or ablation results to support the magnitude or reliability of the reported gains.

    Authors: We agree that the abstract would be strengthened by including quantitative support for this central claim. In the revised manuscript, we will update the abstract to report specific metrics from our experiments, including accuracy improvements over the annotator-aware baseline, the dataset size (number of instances and annotators), and references to the statistical tests and ablation results presented in the evaluation section. This will make the magnitude and reliability of the gains immediately evident to readers. revision: yes

  2. Referee: Methods / Evaluation: the joint-modeling benefits rest on the assumption that annotator-provided rationales are faithful, consistent signals of individual perspectives that transfer cleanly into the User Passport representations; no per-annotator rationale-label alignment metrics, consistency checks, or noise analysis are described, leaving open the possibility that the prefixed bridge and post-hoc mechanisms propagate misalignment rather than enrich the conditioning.

    Authors: This concern about the faithfulness assumption is well-taken. While our current evaluation reports overall label alignment and semantic consistency metrics that support the benefits of joint modeling, we acknowledge the absence of granular per-annotator rationale-label alignment analysis. In the revision, we will add a new subsection with per-annotator alignment metrics, consistency checks across rationales and labels, and a discussion of potential noise sources. This addition will directly address whether the mechanisms enrich conditioning or risk propagating misalignment. revision: yes

Circularity Check

0 steps flagged

No circularity: empirical framework relies on held-out evaluation

full rationale

The paper describes a standard ML pipeline: conditioning a classifier on annotator identity and demographics via a User Passport representation, then fine-tuning two explainer architectures (post-hoc prompt-based and prefixed bridge) on provided rationales, followed by evaluation on held-out label prediction and explanation quality metrics. No equations or derivations are presented that reduce predictions to fitted inputs by construction, no self-definitional loops appear in the modeling choices, and no load-bearing claims rest on self-citations that themselves presuppose the target result. The reported gains in predictive performance and alignment are measured against external benchmarks (baseline annotator-aware classifier and held-out data), rendering the chain self-contained.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The framework assumes standard transformer-based fine-tuning works for conditioning and that provided rationales are usable signals; no invented entities or fitted constants beyond typical ML hyperparameters are described.

axioms (2)
  • domain assumption Annotator rationales faithfully capture individual perspectives
    Central to the joint modeling claim and explainer alignment.
  • domain assumption Conditioning on identity and demographics transfers effectively to explanation generation
    Required for the prefixed bridge explainer to maintain label alignment.

pith-pipeline@v0.9.0 · 5500 in / 1205 out tokens · 28403 ms · 2026-05-09T21:24:30.734132+00:00 · methodology

discussion (0)

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Reference graph

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