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When chunks are scored during retrieval (based on their relevance to the user query), this controls how much weight the scoring gives to exact keyword matches. A higher value means the agent will prioritize finding exact word matches, while a lower value allows for more flexible, meaning-based matching.
The value ranges from 0 to 1, and Contextual AI defaults to 0.1. You can increase this weight if exact terminology, specific entities, or specialized vocabulary is important for your use case.