Challenge: Despite the subjective nature of many NLU evaluations, little attention has been paid to the distribution of human opinions.
Approach: They use a dataset with 464,500 annotations to study Collective HumAn OpinionS . they argue that models lack the ability to recover the distribution over human labels .
Outcome: The proposed dataset examines the distribution of human opinions in NLU evaluation datasets.

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Distributed NLI: Learning to Predict Human Opinion Distributions for Language Reasoning (2022.findings-acl)

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Challenge: Using distributed NLI, we show that models can capture human judgement distribution more effectively than the softmax baseline.
Approach: They propose a new NLU task to predict the distribution of human judgements . they propose Monte Carlo, Deep Ensemble, Re-Calibration and Distribution Distillation methods to capture human judgement distributions.
Outcome: The proposed methods perform better than the softmax baseline, but the results are still far below the estimated human upper-bound.
Capture Human Disagreement Distributions by Calibrated Networks for Natural Language Inference (2022.findings-acl)

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Challenge: Previously, it's common to disregard it as noise or as a sign of poor-quality data, as their annotations are heavily based on personal experience and opinions.
Approach: They propose to capture the human disagreement distribution from the perspective of model calibration.
Outcome: The proposed model can achieve competitive performance when well-calibrated, on divergence scores between predictive probability and the true human opinion distribution, and the accuracy.
What Ingredients Make for an Effective Crowdsourcing Protocol for Difficult NLU Data Collection Tasks? (2021.acl-long)

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Challenge: Despite the importance of datasets for natural language understanding, there has been little attention on crowdsourcing methods for collecting datasets.
Approach: They compare the effectiveness of crowdsourcing methods for boosting NLU example difficulty with training crowdworkers instead of expert judgments.
Outcome: The proposed method is ineffective for boosting NLU example difficulty, but it is not effective for training crowdworkers and qualifying workers based on expert judgments.
Adversarial NLI: A New Benchmark for Natural Language Understanding (2020.acl-main)

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Challenge: a new large-scale NLI benchmark dataset is presented to test models on a variety of popular NLIs.
Approach: They propose a large-scale NLI benchmark dataset that is iteratively compared with a human-and-model-in-the-loop procedure.
Outcome: The proposed method can be applied in a never-ending learning scenario, becoming a moving target for NLU, rather than a static benchmark that will quickly saturate.
Collective Human Opinions in Semantic Textual Similarity (2023.tacl-1)

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Challenge: Existing benchmarks for semantic textual similarity (STS) use averaged human ratings as gold standard.
Approach: They propose to use a Chinese sentence-to-sentence dataset to study collective human opinions in semantic textual similarity (STS) neither a scalar nor a single Gaussian fits a set of observed judgments adequately, they argue .
Outcome: The proposed dataset does not capture disagreements on individual instances, but rather the confidence over the aggregate dataset.
“Seeing the Big through the Small”: Can LLMs Approximate Human Judgment Distributions on NLI from a Few Explanations? (2024.findings-emnlp)

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Challenge: Human label variation arises when multiple human annotators provide different labels for valid reasons.
Approach: They propose to use crowd workers to represent human judgment distributions or expert linguists to provide detailed explanations for their chosen labels.
Outcome: The proposed model can approximate human judgment distributions using a small number of expert labels and explanations.
LLMs instead of Human Judges? A Large Scale Empirical Study across 20 NLP Evaluation Tasks (2025.acl-short)

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Challenge: Existing evaluations of NLP models with LLMs are based on human judgments . however, there are concerns about their validity and reproducibility in proprietary models .
Approach: They evaluate 11 current LLMs for their ability to replicate annotations. they show substantial variance across models and datasets.
Outcome: The proposed model can replicate human annotations on 20 NLP datasets and show substantial variance across models and datasets.
A guide to the dataset explosion in QA, NLI, and commonsense reasoning (2020.coling-tutorials)

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Challenge: a tutorial aims to provide an up-to-date guide to the recent datasets . the target audience is the NLP practitioners who are lost in dozens of the recent data sets.
Approach: This tutorial provides an up-to-date guide to the recent datasets . it surveys old and new methodological issues with dataset construction .
Outcome: This tutorial aims to provide an up-to-date guide to the recent datasets . it surveys the old and new methodological issues with dataset construction .
Ecologically Valid Explanations for Label Variation in NLI (2023.findings-emnlp)

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Challenge: Human label variation exists in many natural language processing tasks, including NLI .
Approach: They build an English dataset of 1,415 ecologically valid explanations for 122 MNLI items . they find that people can systematically vary on their interpretation .
Outcome: The proposed dataset contains 1,415 ecologically valid explanations for 122 items . the results show that people can vary on interpretation and highlight differences .
OCNLI: Original Chinese Natural Language Inference (2020.findings-emnlp)

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Challenge: Recent efforts to extend natural language understanding to other languages have focused on (automatically) translating existing English datasets.
Approach: They propose to use a Chinese dataset to generate annotated sentences from native speakers specializing in linguistics to elicit annotations.
Outcome: The proposed dataset does not rely on automatic translation or non-expert annotation. instead, it elicits annotations from native speakers specializing in linguistics.

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