Furthermore, PKG introduces an innovative method for in-
tegrating knowledge into white-box models via directive fine-
tuning [Luo et al., 2023]. In this approach, the retriever mod-
ule is directly substituted to generate relevant documents ac-
cording to a query. This method assists in addressing the dif-
ficulties encountered during the fine-tuning process and en-
hances model performance.
RAG forLargeLanguageModels-ASurvey