It seems DRIFT search uses vector similarity search with top-k communities in the top-most hierarchy, and then drills down to the lower hierarchy levels. They seem to use follow-up questions for this purpose. The answers are ranked based on relavance to the query. Need to check the paper for more details.
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December 23, 2024 04:31
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Introducing DRIFT Search: Combining global and local search methods to improve quality and efficiency : NOTES
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