langchain

0.2.0

Deleted

As of release 0.2.0, langchain is required to be integration-agnostic. This means that code in langchain should not by default instantiate any specific chat models, llms, embedding models, vectorstores etc; instead, the user will be required to specify those explicitly.

The following functions and classes require an explicit LLM to be passed as an argument:

• langchain.agents.agent_toolkits.vectorstore.toolkit.VectorStoreToolkit
• langchain.agents.agent_toolkits.vectorstore.toolkit.VectorStoreRouterToolkit
• langchain.chains.openai_functions.get_openapi_chain
• langchain.chains.router.MultiRetrievalQAChain.from_retrievers
• langchain.indexes.VectorStoreIndexWrapper.query
• langchain.indexes.VectorStoreIndexWrapper.query_with_sources
• langchain.indexes.VectorStoreIndexWrapper.aquery_with_sources
• langchain.chains.flare.FlareChain

The following classes now require passing an explicit Embedding model as an argument:

• langchain.indexes.VectostoreIndexCreator

The following code has been removed:

• langchain.natbot.NatBotChain.from_default removed in favor of the from_llm class method.

Deprecated

We have two main types of deprecations:

1. Code that was moved from langchain into another package (e.g, langchain-community)

If you try to import it from langchain, the import will keep on working, but will raise a deprecation warning. The warning will provide a replacement import statement.

python -c "from langchain.document_loaders.markdown import UnstructuredMarkdownLoader"

API Reference:UnstructuredMarkdownLoader

LangChainDeprecationWarning: Importing UnstructuredMarkdownLoader from langchain.document_loaders is deprecated. Please replace deprecated imports:

>> from langchain.document_loaders import UnstructuredMarkdownLoader

with new imports of:

>> from langchain_community.document_loaders import UnstructuredMarkdownLoader

API Reference:UnstructuredMarkdownLoader | UnstructuredMarkdownLoader

We will continue supporting the imports in langchain until release 0.4 as long as the relevant package where the code lives is installed. (e.g., as long as langchain_community is installed.)

However, we advise for users to not rely on these imports and instead migrate to the new imports. To help with this process, we’re releasing a migration script via the LangChain CLI. See further instructions in migration guide.

1. Code that has better alternatives available and will eventually be removed, so there’s only a single way to do things. (e.g., predict_messages method in ChatModels has been deprecated in favor of invoke).

Many of these were marked for removal in 0.2. We have bumped the removal to 0.3.

0.1.0 (Jan 5, 2024)

Deleted

No deletions.

Deprecated

Deprecated classes and methods will be removed in 0.2.0

Deprecated	Alternative	Reason
ChatVectorDBChain	ConversationalRetrievalChain	More general to all retrievers
create_ernie_fn_chain	create_ernie_fn_runnable	Use LCEL under the hood
created_structured_output_chain	create_structured_output_runnable	Use LCEL under the hood
NatBotChain		Not used
create_openai_fn_chain	create_openai_fn_runnable	Use LCEL under the hood
create_structured_output_chain	create_structured_output_runnable	Use LCEL under the hood
load_query_constructor_chain	load_query_constructor_runnable	Use LCEL under the hood
VectorDBQA	RetrievalQA	More general to all retrievers
Sequential Chain	LCEL	Obviated by LCEL
SimpleSequentialChain	LCEL	Obviated by LCEL
TransformChain	LCEL/RunnableLambda	Obviated by LCEL
create_tagging_chain	create_structured_output_runnable	Use LCEL under the hood
ChatAgent	create_react_agent	Use LCEL builder over a class
ConversationalAgent	create_react_agent	Use LCEL builder over a class
ConversationalChatAgent	create_json_chat_agent	Use LCEL builder over a class
initialize_agent	Individual create agent methods	Individual create agent methods are more clear
ZeroShotAgent	create_react_agent	Use LCEL builder over a class
OpenAIFunctionsAgent	create_openai_functions_agent	Use LCEL builder over a class
OpenAIMultiFunctionsAgent	create_openai_tools_agent	Use LCEL builder over a class
SelfAskWithSearchAgent	create_self_ask_with_search	Use LCEL builder over a class
StructuredChatAgent	create_structured_chat_agent	Use LCEL builder over a class
XMLAgent	create_xml_agent	Use LCEL builder over a class