Finetuning for Domain Knowledge and Questions

Semantic search is a useful tool, but this does not mean that there are no problems with semantic search, as with fine tuning. With a large number of documents, there is no guarantee that the tool will find the right document. It may happen that the information that the model needs for the answer is in different documents. It is also possible that the best documents do not get the best score.

I am interested in whether ChatGpt uses semantic search??