text: Chain class? Answer: There are multiple classes that are derived from the Chain class. Some of them are:APIChainAnalyzeDocumentChainChatVectorDBChainCombineDocumentsChainConstitutionalChainConversationChainGraphQAChainHypotheticalDocumentEmbedderLLMChainLLMCheckerChainLLMRequestsChainLLMSummarizationCheckerChainMapReduceChainOpenAPIEndpointChainPALChainQAWithSourcesChainRetrievalQARetrievalQAWithSourcesChainSequentialChainSQLDatabaseChainTransformChainVectorDBQAVectorDBQAWithSourcesChainThere might be more classes that are derived from the Chain class as it is possible to create custom classes that extend the Chain class.-> Question: What classes and functions in the ./langchain/utilities/ forlder are not covered by unit tests? Answer: All classes and functions in the ./langchain/utilities/ folder seem to have unit tests written for them.PreviousCode UnderstandingNextAnalysis of Twitter the-algorithm source code with LangChain, GPT4 and Activeloop's Deep LakeDesignImplementationIntegration preparationsPrepare dataQuestion AnsweringCommunityDiscordTwitterGitHubPythonJS/TSMoreHomepageBlogCopyright Â© 2023 LangChain, Inc.