Understanding LangChain Expression Language
We’ve covered the core LangChain components. Now, we turn our focus to a pivotal concept that can be used in the creation and execution of these components: LangChain Expression Language (LCEL). Let’s delve deeper into what LCEL is and understand its significance in the LangChain framework.
What is LCEL?
The concept of chains is that they are the key building blocks of LangChain. A chain is a collection of blocks of functionality and in ’its simplest form, a chain would be made up of a prompt, a call to an LLM, and the processing of the result. We’ve seen these functional blocks in the previous section. At their most complex, chains can be made up of hundreds of steps.
LCEL provides a declarative syntax and orchestration framework that was created so users could easily create chains of functionality with a standardized way of defining and invocation to make it as easy as possible to run as well as create...
