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Open-Domain Text Evaluation via Contrastive Distribution Methods

Sidi Lu, Hongyi Liu, Asli Celikyilmaz, Tianlu Wang, and Nanyun Peng, in Proceedings of the Fortieth International Conference on Machine Learning (ICML), 2024.

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@inproceedings{lu2024cdm,
  title = {Open-Domain Text Evaluation via Contrastive Distribution Methods},
  author = {Lu, Sidi and Liu, Hongyi and Celikyilmaz, Asli and Wang, Tianlu and Peng, Nanyun},
  booktitle = {Proceedings of the Fortieth International Conference on Machine Learning (ICML)},
  year = {2024}
}

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    @inproceedings{lu2024cdm,
      title = {Open-Domain Text Evaluation via Contrastive Distribution Methods},
      author = {Lu, Sidi and Liu, Hongyi and Celikyilmaz, Asli and Wang, Tianlu and Peng, Nanyun},
      booktitle = {Proceedings of the Fortieth International Conference on Machine Learning (ICML)},
      year = {2024}
    }
    
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    @inproceedings{wadhawan2024contextual,
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    @inproceedings{qiu2024amrfact,
      title = {AMRFact: Enhancing Summarization Factuality Evaluation with AMR-Driven Negative Samples Generation},
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    @inproceedings{ghazarian2023accent,
      title = {ACCENT: An Automatic Event Commonsense Evaluation Metric for Open-Domain Dialogue Systems},
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    Full Text Abstract BibTeX Details
    Automatic evaluation metrics are essential for the rapid development of open-domain dialogue systems as they facilitate hyper-parameter tuning and comparison between models. Although recently proposed trainable conversation-level metrics have shown encouraging results, the quality of the metrics is strongly dependent on the quality of training data. Prior works mainly resort to heuristic text-level manipulations (e.g. utterances shuffling) to bootstrap incoherent conversations (negative examples) from coherent dialogues (positive examples). Such approaches are insufficient to appropriately reflect the incoherence that occurs in interactions between advanced dialogue models and humans. To tackle this problem, we propose DEAM, a Dialogue coherence Evaluation metric that relies on Abstract Meaning Representation (AMR) to apply semantic-level Manipulations for incoherent (negative) data generation. AMRs naturally facilitate the injection of various types of incoherence sources, such as coreference inconsistency, irrelevancy, contradictions, and decrease engagement, at the semantic level, thus resulting in more natural incoherent samples. Our experiments show that DEAM achieves higher correlations with human judgments compared to baseline methods on several dialog datasets by significant margins. We also show that DEAM can distinguish between coherent and incoherent dialogues generated by baseline manipulations, whereas those baseline models cannot detect incoherent examples generated by DEAM. Our results demonstrate the potential of AMR-based semantic manipulations for natural negative example generation.
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    Full Text Slides Code Abstract BibTeX Details
    With the recent advances of open-domain story generation models, the lack of reliable automatic evaluation metrics becomes an increasingly imperative issue that hinders the development of such models. A critical bottleneck of obtaining a trustworthy learnable evaluation metric is the lack of high-quality training data for learning classifiers to efficiently distinguish between plausible and implausible machine-generated stories. Previous works relied on heuristically manipulate plausible examples to mimic possible system drawbacks such as repetition, contradiction, or irrelevant content in the text level, which can be unnatural and oversimplify the characteristics of implausible machine-generated stories. We propose to tackle these issues by generating a more comprehensive set of implausible stories using plots, which are structured representations of controllable factors used to generate stories.  Since these plots are compact and structured, it is easier to manipulate them to generate text with targeted undesirable properties, while at the same time maintain the naturalness of the generation. To improve the quality of incoherent stories, we further apply the adversarial filtering procedure to select a more nuanced set of implausible texts. We find that the evaluation metrics trained on our generated data result in more reliable automatic assessments that correlate remarkably better with human judgments than other baselines.
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    Full Text Code Abstract BibTeX Details
    User engagement is a critical metric for evaluating the quality of open-domain dialogue systems. Prior work has focused on conversation-level engagement by using heuristically constructed features such as the number of turns and the total time of the conversation. In this paper, we investigate the possibility and efficacy of estimating utterance-level engagement and define a novel metric, predictive engagement, for automatic evaluation of open-domain dialogue systems. Our experiments demonstrate that (1) human annotators have high agreement on assessing utterance-level engagement scores; (2) conversation-level engagement scores can be predicted from properly aggregated utterance-level engagement scores. Furthermore, we show that the utterance-level engagement scores can be learned from data. These scores can be incorporated into automatic evaluation metrics for open-domain dialogue systems to improve the correlation with human judgements. This suggests that predictive engagement can be used as a real-time feedback for training better dialogue models.
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    @inproceedings{ghazarian2019better,
      title = {Better Automatic Evaluation of Open-Domain Dialogue Systems with Contextualized Embeddings},
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    @inproceedings{li2019evaluating,
      title = {Evaluating and Enhancing the Robustness of Retrieval-Based Dialogue Systems with Adversarial Examples},
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