example: self-correcting loop for RAG

[ZanSara]

Related Issues

• fixes #5988

Proposed Changes:

Adds an example script with the following Pipeline:

The example has 3 custom component:

• a "switch" component to manage the query over the loops
• a pagination wrapper for a Retriever
• a component that checks for a missing answer

How did you test it?

Notes for the reviewer

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[anakin87]

In general, it looks good...

However, IDK if introducing a custom switch component is appropriate from the user's perspective...
It is a new concept that makes the example a bit harder to understand and replicate. WDYT?

[anakin87]

@masci can you take a look at this PR?

We need another opinion on the Switch component...

[masci]

@anakin87 the one in this PR is a bit different use case, but I was thinking that having a similar component in front of a pipeline is the way to go to simplify the run invocation, so overall I support this design. I wouldn't call it Switch tho, maybe something like Multiplexer would convey the concept that the component receives one or more inputs and sends them out into a single output of the same type.

[ZanSara]

For completeness, here is the updated pipeline graph:

[anakin87]

Very nice!

(just one final comment, but it's good to go)