Mushroom Effect or Why You Need Knowledge Graphs for Dialogue Systems

The document discusses how knowledge graphs are needed for dialogue systems to avoid issues like the "mushroom effect" where answers provided by a system become increasingly vague and less applicable. It provides an example of a dialogue exchange where a system is unable to determine the architectural style of a building mentioned without access to a knowledge graph. The document argues that knowledge graphs allow systems to better constrain answer spaces and perform more complex question answering and reasoning by aggregating information across graphs.