1. , question answering systems based on incomplete KGs would not provide a correct answer given a correctly interpreted question.

2. although the question is completely matched with existing entity and relation type information, it would be impossible to answer the question

University of Michigan - Ann Arbor

because knowledge graphs are typically incomplete, it is useful to perform knowledge graph completion or link prediction, i.e. predict whether a relationship not in the knowledge graph is likely to be true.

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