Before revision:  To tackle these issues, we propose SPADE\spadesuit (SPatial DEpendency parser) , an end-to-end spatial dependency parser that is serializer-free and capable of modeling an arbitrary number of information layers , making it suitable for parsing structure-rich documents such as receipts and multimodal documents such as name cards.
After revision:  To tackle these issues, we first formulate the IE task as spatial dependency parsing problem that focuses on the relationship among text segment nodes in the documents. Under this setup, we then propose SPADE (SPAtial DEpendency parser) , an end-to-end spatial dependency parser that is serializer-free and capable of modeling an arbitrary number of information layers , making it suitable for parsing structure-rich documents such as receipts and multimodal documents such as name cards.