bugfix: rag memleak with weakref

[zcuder]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @zcuder, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

I've implemented a fix for a memory leak identified in the RAG component. The issue stemmed from a circular reference created by the single_string_embedder closure holding a strong reference to the RAG instance. My changes introduce the use of Python's weakref module to break this cycle, ensuring that RAG objects are properly garbage collected when they are no longer referenced, thereby improving the application's memory efficiency.

Highlights

• Memory Leak Fix: I've introduced the weakref module and utilized it to create a weak reference to the RAG instance within its __init__ method. This is crucial for preventing a memory leak.
• Circular Reference Resolution: The single_string_embedder function, which is a closure, was implicitly holding a strong reference to the RAG instance (self). This strong reference created a circular dependency, preventing the RAG object from being garbage collected even when it was no longer needed.
• Improved Memory Management: By changing the single_string_embedder to access self.embedder via a weak reference (self_weakref()), I've broken this strong reference cycle. This ensures that the RAG instance can be properly garbage collected, resolving the memory leak.

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[gemini-code-assist]

Code Review

This pull request correctly addresses a potential memory leak in the RAG component by using a weak reference to break a reference cycle. My review includes a suggestion to make this fix more robust by explicitly handling the edge case where the weak-referenced object might have been garbage-collected, which will prevent silent failures and improve debuggability.