The NorthPeak pipeline of this week joins a prompt template, a model and a parser, and later a retriever. In LangChain every one of these components is a Runnable with the same three methods. That shared interface is what lets you join them with | and run the whole line with one call, on one incident or on 155. This lesson names the three methods, builds a first chain, and shows how to debug it step by step.
A prompt template, a model, a parser, a retriever: in LangChain they are all Runnables. A Runnable has three methods.
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