What's Changed

• Permit none key in chain mapper by @hinthornw in https://github.com/langchain-ai/langchain/pull/8696
• updated interface jupyter notebook explanations by @axa99 in https://github.com/langchain-ai/langchain/pull/8689
• lint by @hinthornw in https://github.com/langchain-ai/langchain/pull/8702
• Bagatur/eden llm by @baskaryan in https://github.com/langchain-ai/langchain/pull/8670
• feat: Add Spell Correction Spec to Google Cloud Enterprise Search connector by @holtskinner in https://github.com/langchain-ai/langchain/pull/8705
• relax deps for yaml by @hwchase17 in https://github.com/langchain-ai/langchain/pull/8713
• added minimum expected version of SDK to the error description by @lkuligin in https://github.com/langchain-ai/langchain/pull/8712
• Deterministic Fake Embedding Model by @yuhuishi-convect in https://github.com/langchain-ai/langchain/pull/8706
• add model_revison parameter to ModelScopeEmbeddings by @sumandeng in https://github.com/langchain-ai/langchain/pull/8669
• RSS Feed / OPML loader by @ruze00 in https://github.com/langchain-ai/langchain/pull/8694
• Fix Async Retry Event Handling by @hinthornw in https://github.com/langchain-ai/langchain/pull/8659
• fix RecursiveUrlLoader by @rysloan4 in https://github.com/langchain-ai/langchain/pull/8582
• add serializer methods by @balnarendrasapa in https://github.com/langchain-ai/langchain/pull/7914
• propagate RetrievalQA chain callbacks through its own LLMChain and StuffDocumentsChain by @alecf in https://github.com/langchain-ai/langchain/pull/7853
• propagate callbacks through load_summarize_chain by @alecf in https://github.com/langchain-ai/langchain/pull/7565
• Updates to Vectara documentation by @ofermend in https://github.com/langchain-ai/langchain/pull/8699
• Fix Issue #6650: Enable Azure Active Directory token-based auth access for AzureChatOpenAI by @vmansolas in https://github.com/langchain-ai/langchain/pull/8622
• Add regex control over separators in character text splitter by @IlyaMichlin in https://github.com/langchain-ai/langchain/pull/7933
• Provides access to a Document page_content formatter in the AmazonKendraRetriever by @wnleao in https://github.com/langchain-ai/langchain/pull/8034
• Harrison/aleph alpha by @hwchase17 in https://github.com/langchain-ai/langchain/pull/8735
• Retriever that can re-phase user inputs by @rlancemartin in https://github.com/langchain-ai/langchain/pull/8026
• Reduce generation of temporary objects by @panzi in https://github.com/langchain-ai/langchain/pull/7950
• Removing score threshold parameter of faiss _similarity_search_with_r… by @Sidchat95 in https://github.com/langchain-ai/langchain/pull/8093
• Issue 8081 Fix query results size bug. Other bug: pass vector_field param. by @aerickson-clt in https://github.com/langchain-ai/langchain/pull/8085
• typo: ignored to ignore by @linpan in https://github.com/langchain-ai/langchain/pull/8740
• Issue #8089 Improve painless script scoring with params.query_value. by @aerickson-clt in https://github.com/langchain-ai/langchain/pull/8086
• add save and load tfidf vectorizer and docs for TFIDFRetriever by @shibuiwilliam in https://github.com/langchain-ai/langchain/pull/8112
• add filter to sklearn vector store functions by @shibuiwilliam in https://github.com/langchain-ai/langchain/pull/8113
• Fix load map reduce documents chain by @deepblue in https://github.com/langchain-ai/langchain/pull/7915
• Add ScaNN support in vectorstore. by @arron2003 in https://github.com/langchain-ai/langchain/pull/8251
• add load() deserializer function that bypasses need for json serialization by @alecf in https://github.com/langchain-ai/langchain/pull/7626
• support for arbitrary kwargs for llamacpp by @baskaryan in https://github.com/langchain-ai/langchain/pull/8727
• Chatbots use case by @rlancemartin in https://github.com/langchain-ai/langchain/pull/8554
• update repo username to langchain-ai by @benman1 in https://github.com/langchain-ai/langchain/pull/8747
• Revert "add filter to sklearn vector store functions (#8113)" by @baskaryan in https://github.com/langchain-ai/langchain/pull/8760
• bump 252 by @baskaryan in https://github.com/langchain-ai/langchain/pull/8759

New Contributors

• @axa99 made their first contribution in https://github.com/langchain-ai/langchain/pull/8689
• @yuhuishi-convect made their first contribution in https://github.com/langchain-ai/langchain/pull/8706
• @sumandeng made their first contribution in https://github.com/langchain-ai/langchain/pull/8669
• @rysloan4 made their first contribution in https://github.com/langchain-ai/langchain/pull/8582
• @balnarendrasapa made their first contribution in https://github.com/langchain-ai/langchain/pull/7914
• @vmansolas made their first contribution in https://github.com/langchain-ai/langchain/pull/8622
• @panzi made their first contribution in https://github.com/langchain-ai/langchain/pull/7950
• @aerickson-clt made their first contribution in https://github.com/langchain-ai/langchain/pull/8085
• @linpan made their first contribution in https://github.com/langchain-ai/langchain/pull/8740
• @arron2003 made their first contribution in https://github.com/langchain-ai/langchain/pull/8251

Full Changelog: https://github.com/langchain-ai/langchain/compare/v0.0.251...v0.0.252