Web Reference: Learn how LangGraph's Pregel runtime orchestrates actor-channel interactions using typed channels and discrete execution steps. This tutorial demonstrates building a simple data flow with ... PregelNodes implement LangChain’s Runnable interface. Channels are used to communicate between actors (PregelNodes). Each channel has a value type, an update type, and an update function—which takes a sequence of updates and modifies the stored value. Actors An actor is a PregelNode. It subscribes to channels, reads data from them, and writes data to them. It can be thought of as an actor in the Pregel algorithm. PregelNodes implement LangChain's Runnable interface.
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