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Knowledge Graphs & GraphRAG: sections and modules
T13.1

Hierarchical & Memory-Augmented Retrieval

Build a recursive tree of abstractive summaries (RAPTOR) and retrieve across its levels.

Lessons
5 lessons
By
Sourav Banerjee
Prerequisites
None
5 lessons

Practise and Check

Deliverable
Global-question test: ask ten 'summarise / compare across the whole corpus' questions and compare flat RAG, RAPTOR and LightRAG.
Assessment
Answer the five Interview questions without notes, then run the lab.
Interview probe
Larkspur's assistant says cancelled accounts lose data immediately, although the source passage describes a retention window. The retrieved summary omits that window. How do you debug it?
Common mistakes
  • Quoting a condition from a summary without checking its source passages
  • Updating the source index but not the memory entries derived from it
  • Removing a withdrawn passage without recomputing the merged graph profiles

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