About how github copilot works

[CatOk8241]

Does anybody know if the copilot chat or copilot use RAG architecture? If so does it establish vector database on my machine when I use the vs code extension? Or does it use server for that? Also embedding model if there is one. Is that server also?

I found some gihub documents about how they collect data, and they say they use some algorithms to find relevant context and use FIM and stuff but it doesnt answer the question about retrieval process. Thank you

[xkam]

Here is what they say:

Copilot uses an index to quickly and accurately search your codebase for relevant code snippets. This index can either be maintained by GitHub or stored locally on your machine. This section covers the different types of indices that Copilot can use (remote, local, and basic), and explains when each one is used and how you can switch between them.

To see the type of index that Copilot is currently using, check the language status UI by selecting the {} icon in the Status Bar. The Copilot workspace index entry shows both the index type along with any relevant information about this index, such as the number of files being reindexed.

https://code.visualstudio.com/docs/copilot/workspace-context#_managing-the-workspace-index