BERTScore: Evaluating Text Generation with BERT

04/21/2019

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by   Tianyi Zhang, et al.

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We propose BERTScore, an automatic evaluation metric for text generation. Analogous to common metrics, computes a similarity score for each token in the candidate sentence with each token in the reference. However, instead of looking for exact matches, we compute similarity using contextualized BERT embeddings. We evaluate on several machine translation and image captioning benchmarks, and show that BERTScore correlates better with human judgments than existing metrics, often significantly outperforming even task-specific supervised metrics.