mapreduce

Abstract base class for creating structured sequences of calls to components.

Chains should be used to encode a sequence of calls to components like models, document retrievers, other chains, etc., and provide a simple interface to this sequence.

Base interface for chains combining documents.

Subclasses of this chain deal with combining documents in a variety of ways. This base class exists to add some uniformity in the interface these types of chains should expose. Namely, they expect an input key related to the documents to use (default input_documents), and then also expose a method to calculate the length of a prompt from documents (useful for outside callers to use to determine whether it's safe to pass a list of documents into this chain or whether that will be longer than the context length).