Jaankoppe-llama-index

New Features
- Added Portkey LLM integration (7508)
- Support postgres/pgvector hybrid search (7501)
- upgrade recursive retriever node reference notebook (7537)

New Features
- replace list index with summary index (7478)
- rename list index to summary index part 2 (7531)

New Features
- add agent finetuning guide (7526)

New Features
- Make (some) loaders serializable (7498)
- add node references to recursive retrieval (7522)

Bug Fixes / Nits
- Raise informative error when metadata is too large during splitting (7513)
- Allow langchain splitter in simple node parser (7517)

Bug Fixes / Nits
- fix link to Marvin notebook in docs (7504)
- Ensure metadata is not `None` in `SimpleWebPageReader` (7499)
- Fixed KGIndex visualization (7493)
- Improved empty response in KG Index (7493)

New Features
- Added support for `MarvinEntityExtractor` metadata extractor (7438)
- Added a url_metadata callback to SimpleWebPageReader (7445)
- Expanded callback logging events (7472)

Bug Fixes / Nits
- Only convert newlines to spaces for text 001 embedding models in OpenAI (7484)
- Fix `KnowledgeGraphRagRetriever` for non-nebula indexes (7488)
- Support defined embedding dimension in `PGVectorStore` (7491)
- Greatly improved similarity calculation speed for the base vector store (7494)