EXPLAIGNN

Demo

More efficient Better performance

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Question

Who wrote the book Angels and Demons?

Provided answer

Dan Brown

System interpretation

Current entity: Angels and Demons
Relation: Who wrote the book
Expected answer type: human

Supporting evidences

#1: Angels & Demons, Author, Dan Brown. [Infobox]

#2: Angels & Demons, author, Dan Brown. [KB]

#3: Angels & Demons (film), Angels Demons, Based on, Angels Demons by Dan Brown. [Infobox]

#4: Angels & Demons, after a work by, Dan Brown. [KB]

#5: Dan Brown, notable work, Angels & Demons. [KB]

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Answer

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Description

In conversational question answering, users express their information needs through a series of utterances with incomplete context. Typical ConvQA methods rely on a single source (a knowledge base (KB), or a text corpus, or a set of tables), thus being unable to benefit from increased answer coverage and redundancy of multiple sources. Our method EXPLAIGNN overcomes these limitations by integrating information from a mixture of sources with user-comprehensible explanations for answers. It constructs a heterogeneous graph from entities and evidence snippets retrieved from a KB, a text corpus, web tables, and infoboxes. This large graph is then iteratively reduced via graph neural networks that incorporate question-level attention, until the best answers and their explanations are distilled. Experiments show that EXPLAIGNN improves performance over state-of-the-art baselines. A user study demonstrates that derived answers are understandable by end users.