2. Optimizing Index Structures:

This can be
achieved by adjusting the size of the chunks, alter-
ing the index paths, and incorporating graph struc-
ture information. The method of adjusting chunks
(Small to Big) involves collecting as much relevant
context as possible and minimizing noise. When
constructing a RAG system, the chunk size is a key
parameter. There are different evaluation frame-
works comparing the size of individual chunks.
LlamaIndex2 uses GPT4 to assess fidelity and rele-

2https://www.llamaindex.ai
Retrieval-AugmentedGenerationforLargeLanguageModels-ASurvey