A follow-up question is: what is the lossless way to represent knowledge? That would mean reading all the knowledge at once, which is the most accurate but also the least efficient method. Therefore, for different applications, we need to find an appropriate trade-off between accuracy and efficiency. In systems like real-time recommendation, we prefer efficiency over accuracy, so vector-based search is suitable. In domain-specific QA, we prefer accuracy over efficiency, so maybe a table-of-contents–based search may be the better choice.