yes! i found the notebook but previously, GPTSimpleVectorIndex used to have a QA template which has now moved to GPTSimpleVectorIndex with multi-step query combiner... so i'm curious about the motivation behind this π
okay... so looks like the default_qa_template is used by GPTVectorStoreIndexQuery which is in turn used by GPTVectorStoreIndex. It's a bit complex but I think I get it now.