| Challenge: | Taxonomies are used to classify items, ideas or organisms based on shared characteristics. |
| Approach: | They introduce two reference-free metrics for quality evaluation of taxonomies in the absence of labels. |
| Outcome: | The proposed metrics correlate well with F1 against ground truth taxonomies on five taxonomies and improve hierarchical classification when used with label hierarchies. |
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Is Reference Necessary in the Evaluation of NLG Systems? When and Where? (2024.naacl-long)
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| Challenge: | Despite recent advances in reference-free metrics, it has not been well understood when and where they can be used as an alternative to reference-based metrics. |
| Approach: | They propose to use reference-free metrics to evaluate NLG systems . they find they have a higher correlation with human judgment and greater sensitivity to deficiencies in language quality . |
| Outcome: | The proposed metrics exhibit higher correlation with human judgment and greater sensitivity to deficiencies in language quality. |
Mitigating the Impact of Reference Quality on Evaluation of Summarization Systems with Reference-Free Metrics (2024.emnlp-main)
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| Challenge: | Existing metrics for summarization are reference-based and correlate poorly with relevance . fluency, faithfulness, coherence and relevance are all measures of human evaluation . |
| Approach: | They propose a reference-free metric that correlates well with human evaluated relevance . n-gram importance weighting is used to weight a summary's importance . |
| Outcome: | The proposed metric can be used along reference-based metrics to improve their robustness in low quality reference settings. |
Spurious Correlations in Reference-Free Evaluation of Text Generation (2022.acl-long)
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| Challenge: | Recent work suggests that reference-free evaluation metrics may rely on spurious correlations with human judgments. |
| Approach: | They propose to use model-based, reference-free evaluation metrics to evaluate natural language generation systems. |
| Outcome: | The proposed metrics achieve high correlations with human judgments, but they may not be robust enough to evaluate their efficacy and robustness. |
On the Limitations of Reference-Free Evaluations of Generated Text (2022.emnlp-main)
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| Challenge: | a recent study has shown that evaluation metrics which accurately estimate the quality of generated text are limited in their ability to evaluate generated text. |
| Approach: | They argue that reference-free metrics are limited in their ability to evaluate generated text . they recommend that they be used as diagnostic tools for analyzing and understanding model behavior . |
| Outcome: | The proposed evaluation metrics are limited in their ability to evaluate generated text . they can be optimized at test time, can be biased against models with similar outputs . |
Standard Quality Criteria Derived from Current NLP Evaluations for Guiding Evaluation Design and Grounding Comparability and AI Compliance Assessments (2025.findings-acl)
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| Challenge: | Existing evaluations do not evaluate the same aspect of quality, resulting in unclear comparability and low repeatability. |
| Approach: | They propose to use a standard set of qualitycriterion names and definitions to establish comparability of existing evaluations. |
| Outcome: | The proposed taxonomy combines 114 quality criteria from 3 surveys of 933 evaluations in NLP and is used to establish comparability of existing evaluations and guide the design of new evaluations. |
Assessing Reference-Free Peer Evaluation for Machine Translation (2021.naacl-main)
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| Challenge: | Existing methods to evaluate machine translation output are based on comparing MT output to one or more reference translations. |
| Approach: | They propose to use probabilities given by a large, multilingual model as a reference-free metric. |
| Outcome: | The proposed model is robust and likely to offer reasonable performance across a broad spectrum of domains and different system qualities. |
Identifying Reliable Evaluation Metrics for Scientific Text Revision (2025.acl-long)
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| Challenge: | Effective revision is a critical step in scientific writing, ensuring clarity, coherence, and adherence to academic standards. |
| Approach: | They propose to use ROUGE and BERTScore to assess revision quality . they also examine LLM-as-a-judge approaches to assess instruction-following revisions . |
| Outcome: | The proposed method improves the accuracy of revision tasks with and without a gold reference. |
A Tutorial on Evaluation Metrics used in Natural Language Generation (2021.naacl-tutorials)
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| Challenge: | This tutorial presents the evolution of automatic evaluation metrics to their current state along with emerging trends in this field. |
| Approach: | This tutorial presents the evolution of automatic evaluation metrics to their current state . it aims to assess the extent of scientific progress made and identify areas/components that need improvement . |
| Outcome: | This tutorial presents the evolution of automatic evaluation metrics to their current state along with emerging trends in this field. |
A Holistic Approach to Reference-Free Evaluation of Machine Translation (2023.acl-short)
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| Challenge: | Traditional machine translation evaluation relies on reference written by humans . reference-free evaluation gets rid of labor-intensive annotations, which can pivot easily to new domains . |
| Approach: | They propose a reference-free evaluation approach that characterizes evaluation as two aspects: fluency and faithfulness. |
| Outcome: | The proposed approach outperforms SOTA reference-fee metrics on machine translation datasets. |
A Novel Metric for Measuring the Robustness of Large Language Models in Non-adversarial Scenarios (2024.findings-emnlp)
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| Challenge: | Using large language models, we evaluated their robustness on multiple datasets. |
| Approach: | They propose a new metric for assessing model robustness by empirical evaluation of several models on multiple datasets. |
| Outcome: | The proposed metric is based on a set of datasets that are constructed by introducing naturally-occurring, non-malicious perturbations or by generating semantically equivalent paraphrases of input questions or statements. |