HIBERT: Document Level Pre-training of Hierarchical Bidirectional Transformers for Document Summarization

ACL 2019  ·  Xingxing Zhang, Furu Wei, Ming Zhou ·

Neural extractive summarization models usually employ a hierarchical encoder for document encoding and they are trained using sentence-level labels, which are created heuristically using rule-based methods. Training the hierarchical encoder with these \emph{inaccurate} labels is challenging. Inspired by the recent work on pre-training transformer sentence encoders \cite{devlin:2018:arxiv}, we propose {\sc Hibert} (as shorthand for {\bf HI}erachical {\bf B}idirectional {\bf E}ncoder {\bf R}epresentations from {\bf T}ransformers) for document encoding and a method to pre-train it using unlabeled data. We apply the pre-trained {\sc Hibert} to our summarization model and it outperforms its randomly initialized counterpart by 1.25 ROUGE on the CNN/Dailymail dataset and by 2.0 ROUGE on a version of New York Times dataset. We also achieve the state-of-the-art performance on these two datasets.

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Task Dataset Model Metric Name Metric Value Global Rank Result Benchmark
Extractive Text Summarization CNN / Daily Mail HIBERT ROUGE-2 19.95 # 4
ROUGE-1 42.37 # 6
ROUGE-L 38.83 # 6