Corroborating text evaluation results with heterogeneous measures

  • Authors:
  • Enrique Amigó;Julio Gonzalo;Jesús Giménez;Felisa Verdejo

  • Affiliations:
  • UNED, Madrid;UNED, Madrid;UPC, Barcelona;UNED, Madrid

  • Venue:
  • EMNLP '11 Proceedings of the Conference on Empirical Methods in Natural Language Processing
  • Year:
  • 2011

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Abstract

Automatically produced texts (e.g. translations or summaries) are usually evaluated with n-gram based measures such as BLEU or ROUGE, while the wide set of more sophisticated measures that have been proposed in the last years remains largely ignored for practical purposes. In this paper we first present an in-depth analysis of the state of the art in order to clarify this issue. After this, we formalize and verify empirically a set of properties that every text evaluation measure based on similarity to human-produced references satisfies. These properties imply that corroborating system improvements with additional measures always increases the overall reliability of the evaluation process. In addition, the greater the heterogeneity of the measures (which is measurable) the higher their combined reliability. These results support the use of heterogeneous measures in order to consolidate text evaluation results.