External Index Retrievers & Multi Retrievers

 What are External Index Retrievers?

External Index Retrievers search over external data sources (e.g., the internet, academic databases, knowledge bases)

rather than local vector store.

If we have a use case where data we need a combination of Vector DB + Latest data from Internet + LLM's existing Knowledge and functionality.

This can be achieved by the concept of Multi Retrievers. Context is created with a combination of data from the below 2 sources.

1. Data from Vector DB

2. Fetch latest data from Internet search

Here, are the available external retrievers those are available to use for each of the requirement.

https://docs.langchain.com/oss/python/integrations/retrievers