| Challenge: | Existing evaluation metrics for monolingual summarization require translation to evaluate the factuality of cross-lingual summmarization. |
| Approach: | They propose to analyze cross-lingual factuality by collecting annotations and generated summaries from models at summary level and sentence level. |
| Outcome: | The proposed dataset shows that over 50% of generated summaries contain factual errors with different characteristics from monolingual summarization. |
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Multilingual Summarization with Factual Consistency Evaluation (2023.findings-acl)
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| Challenge: | Abstractive summarization models generate factually inconsistent summaries, reducing their utility for real-world applications. |
| Approach: | They propose to use data filtering and controlled generation to detect hallucinations in machine generated summaries. |
| Outcome: | The proposed models detect factual inconsistencies in machine generated summaries, but they focus on English only. |
Understanding Factuality in Abstractive Summarization with FRANK: A Benchmark for Factuality Metrics (2021.naacl-main)
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| Challenge: | Modern summarization models generate fluent but often factually unreliable outputs. |
| Approach: | They propose to use human annotations to identify different categories of factual errors and benchmark factuality metrics to improve summarization evaluation. |
| Outcome: | The proposed method identifies the proportion of different categories of factual errors and benchmarks their human judgements as well as their specific strengths and weaknesses. |
A Survey on Cross-Lingual Summarization (2022.tacl-1)
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| Challenge: | Cross-lingual summarization is a task of generating a summary in one language for a given document in a different language. |
| Approach: | They present a systematic review of the literature on cross-lingual summarization . they summarize previous efforts and compare them with each other . |
| Outcome: | The proposed approach is compared with previous approaches and summarizes them to provide a deeper analysis. |
Annotating and Modeling Fine-grained Factuality in Summarization (2021.naacl-main)
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| Challenge: | Recent abstractive summarization systems produce factual errors that are not faithful to the input . current methods are lacking in identifying what errors are most important to target . |
| Approach: | They use synthetic and human-labeled data to identify factual errors in summarization and train models on the factuality detection task. |
| Outcome: | The proposed model detects factual errors on word, dependency, and sentence levels. |
Understanding Factual Errors in Summarization: Errors, Summarizers, Datasets, Error Detectors (2023.acl-long)
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Liyan Tang, Tanya Goyal, Alex Fabbri, Philippe Laban, Jiacheng Xu, Semih Yavuz, Wojciech Kryscinski, Justin Rousseau, Greg Durrett
| Challenge: | Abstractive summarization systems still include factual errors in generated summaries despite recent improvements in factuality detection . |
| Approach: | They aggregate factuality error annotations from nine existing datasets and stratify them according to the underlying summarization model. |
| Outcome: | The proposed method improves on the ChatGPT-based model and shows that it is not superior for all error types. |
Factual Consistency Evaluation for Text Summarization via Counterfactual Estimation (2021.findings-emnlp)
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| Challenge: | Existing methods to evaluate factual consistency in text summarization neglect the intrinsic cause of factual inconsistency or rely on auxiliary tasks. |
| Approach: | They propose a method to evaluate the factual consistency in text summarization via counterfactual estimation, which formulates the causal relationship between source document, generated summary, and the language prior. |
| Outcome: | The proposed metric improves correlation with human judgments and convenience of usage on three public abstractive text summarization datasets. |
Models and Datasets for Cross-Lingual Summarisation (2021.emnlp-main)
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| Challenge: | Recent years have witnessed increased interest in abstractive summarisation thanks to the popularity of neural network models and the availability of datasets containing hundreds of thousands of document-summary pairs. |
| Approach: | They propose to create a cross-lingual summarisation corpus with long documents in a source language associated with multi-sentence summaries in . target language. |
| Outcome: | The proposed task can be applied to several other languages and covers twelve languages and directions. |
Questioning the Validity of Summarization Datasets and Improving Their Factual Consistency (2022.emnlp-main)
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| Challenge: | Abstractive summarization systems have a lack of a defined definition for the task . factual consistency is a key factor in summarizing, but there are still deficiencies . a new study shows that summarized summarisation models achieve improved performance . |
| Approach: | They propose a filtered summarization dataset with improved factual consistency to address this problem . they argue that the dataset should become a valid benchmark for developing and evaluating summarizing systems . |
| Outcome: | The proposed model improves on a popular summarization dataset with improved factual consistency. |
Revisiting Cross-Lingual Summarization: A Corpus-based Study and A New Benchmark with Improved Annotation (2023.acl-long)
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Yulong Chen, Huajian Zhang, Yijie Zhou, Xuefeng Bai, Yueguan Wang, Ming Zhong, Jianhao Yan, Yafu Li, Judy Li, Xianchao Zhu, Yue Zhang
| Challenge: | Existing work on cross-lingual summarization (CLS) does not consider crosslingual sources for summarizing. |
| Approach: | They propose a cross-lingual conversation summarization benchmark that explicitly considers source context. |
| Outcome: | The proposed method surpasses baselines on ConvSumX and 3 widely-used manual annotations. |
NonFactS: NonFactual Summary Generation for Factuality Evaluation in Document Summarization (2023.findings-acl)
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| Challenge: | Pre-trained abstractive summarization models generate fluent summaries that are inconsistent with context document and contain nonfactual information. |
| Approach: | They propose a data generation model that synthesizes nonfactual summaries using human annotations. |
| Outcome: | The proposed model can generate nonfactual summaries and generalize to out-of-domain documents. |