LangChain Expression Language (LCEL) and its Application for Building RAG Chatbots

In this video, we present the big picture of LangChain Expression Language (LCEL) in just 5 minutes through a number of sample codes in Python with their detailed explanation. Specifically, we show you how to build a simple RAG (Retrieval-Augmented Generation) chatbot using LCEL. LangChain Expression Language (LCEL) is a declarative language used to connect chains easily, allowing developers to build applications that leverage the capabilities of large language models (LLMs). It was designed to facilitate placing prototypes in production with no code modifications and provides a simple and d…