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Big docs refactor! Motivation is to make it easier for people to find resources they are looking for. To accomplish this, there are now three main sections: - Getting Started: steps for getting started, walking through most core functionality - Modules: these are different modules of functionality that langchain provides. Each part here has a "getting started", "how to", "key concepts" and "reference" section (except in a few select cases where it didnt easily fit). - Use Cases: this is to separate use cases (like summarization, question answering, evaluation, etc) from the modules, and provide a different entry point to the code base. There is also a full reference section, as well as extra resources (glossary, gallery, etc) Co-authored-by: Shreya Rajpal <ShreyaR@users.noreply.github.com>
22 lines
1.2 KiB
Markdown
22 lines
1.2 KiB
Markdown
# Key Concepts
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## Chains
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A chain is made up of links, which can be either primitives or other chains.
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They vary greatly in complexity and are combination of generic, highly configurable pipelines and more narrow (but usually more complex) pipelines.
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## Sequential Chain
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This is a specific type of chain where multiple other chains are run in sequence, with the outputs being added as inputs
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to the next. A subtype of this type of chain is the `SimpleSequentialChain`, where all subchains have only one input and one output,
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and the output of one is therefor used as sole input to the next chain.
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## CombineDocuments Chains
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These are a subset of chains designed to work with documents. There are two pieces to consider:
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1. The underlying chain method (eg, how the documents are combined)
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2. Use cases for these types of chains.
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For the first, please see [this documentation](combine_docs.md) for more detailed information on the types of chains LangChain supports.
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For the second, please see the Use Cases section for more information on [question answering](/use_cases/question_answering.md),
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[question answering with sources](/use_cases/qa_with_sources.md), and [summarization](/use_cases/summarization.md).
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