Challenge: Recent research has shown that reproducibility of NLP experiments is not guaranteed by arbitrary factors like random seed and different data splits.
Approach: They propose to run the training and testing pipeline for three neural text simplification models under varying experimental conditions using the same data and train/dev/test set splits.
Outcome: The proposed pipeline yields a large number of results for three neural text simplification models under varying experimental conditions.

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Challenge: Existing statistical tests to compare the test scores of different NLP models have been proposed to account for nuisance factors such as noise, randomness, or hyperparameter values.
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Unveiling the Multi-Annotation Process: Examining the Influence of Annotation Quantity and Instance Difficulty on Model Performance (2023.findings-emnlp)

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Challenge: Existing studies have shown that multi-annotator datasets can improve performance when they expand from a single annotation per instance to multiple annotations.
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We Need to Talk About train-dev-test Splits (2021.emnlp-main)

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Challenge: Standard train-dev-test splits used to benchmark multiple models are now used in NLP . comparing multiple versions of the same model on the test data leads to overfitting and "expiration" of test sets.
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Robust Estimation of Population-Level Effects in Repeated-Measures NLP Experimental Designs (2025.acl-long)

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Challenge: a study shows that linear mixed-effects models can capture language-dependent differences in a population . a long-standing concern in experimental linguistics is the multilevel nature of language data . significance testing is inconsistent or improperly applied, authors say .
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Predicting Performance for Natural Language Processing Tasks (2020.acl-main)

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Challenge: Natural language processing (NLP) is a vast field, with a wide variety of tasks, languages, and domains.
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Investigating Text Simplification Evaluation (2021.findings-acl)

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Challenge: Existing studies show that parallel TS corpora contain inaccurate simplifications and incorrect alignments.
Approach: They propose to improve the distribution of parallel text simplification corpora to build more robust TS models.
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Principles from Clinical Research for NLP Model Generalization (2024.naacl-long)

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Challenge: In clinical research, generalizability depends on (a) internal validity of experiments and (b) external validity or transportability of the results to the wider population.
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Gauging the Gap Between Human and Machine Text Simplification Through Analytical Evaluation of Simplification Strategies and Errors (2023.findings-eacl)

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Challenge: Recent studies on text simplification have focused on lexical and syntactic simplification, but few studies have attempted to assess what kind of editing operations are performed by the systems in concrete terms.
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Challenge: Recent work shows that treebank size and linguistic variation are important factors that explain the variation in dependency parsing performance.
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Measuring the Instability of Fine-Tuning (2023.acl-long)

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Challenge: Many previous studies have investigated fine-tuning pre-trained language models on downstream tasks with varying random seeds, but they only used the standard deviation of performance scores (SD) as their measure, which is a narrow characterization of instability.
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