LAMBERT: Layout-Aware (Language) Modeling for information extraction

• URL: http://arxiv.org/abs/2002.08087v5
• Date: Fri, 28 May 2021 12:29:14 GMT
• Title: LAMBERT: Layout-Aware (Language) Modeling for information extraction
• Authors: {\L}ukasz Garncarek and Rafa{\l} Powalski and Tomasz Stanis{\l}awek and Bartosz Topolski and Piotr Halama and Micha{\l} Turski and Filip Grali\'nski
• Abstract summary: We introduce a new approach to the problem of understanding documents where non-trivial layout influences the local semantics. We modify the Transformer encoder architecture in a way that allows it to use layout features obtained from an OCR system. We show that our model achieves superior performance on datasets consisting of visually rich documents.
• Score: 2.5907188217412456
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We introduce a simple new approach to the problem of understanding documents where non-trivial layout influences the local semantics. To this end, we modify the Transformer encoder architecture in a way that allows it to use layout features obtained from an OCR system, without the need to re-learn language semantics from scratch. We only augment the input of the model with the coordinates of token bounding boxes, avoiding, in this way, the use of raw images. This leads to a layout-aware language model which can then be fine-tuned on downstream tasks. The model is evaluated on an end-to-end information extraction task using four publicly available datasets: Kleister NDA, Kleister Charity, SROIE and CORD. We show that our model achieves superior performance on datasets consisting of visually rich documents, while also outperforming the baseline RoBERTa on documents with flat layout (NDA \(F_{1}\) increase from 78.50 to 80.42). Our solution ranked first on the public leaderboard for the Key Information Extraction from the SROIE dataset, improving the SOTA \(F_{1}\)-score from 97.81 to 98.17.

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