welcome

Thank you so much for purchasing "LangChain in Action". Your interest in this cutting-edge topic means a great deal to me, and I am excited to guide you through the expansive world of large language models (LLMs).

This book emerged from my professional journey as a software developer, where my main focus has been quantitative development in finance. Over the years, I occasionally delved into AI projects aimed at tackling problems where traditional mathematical computations fell short. My fascination with LLMs began when I encountered ChatGPT in November 2022. Its capabilities inspired me to explore further, leading me to experiment with the OpenAI APIs, delve into prompt engineering, and design applications using Retrieval Augmented Generation (RAG). My involvement with LangChain, an open-source LLM application framework, significantly accelerated my learning and allowed me to witness its rapid adoption within the community.

"LangChain in Action" is structured to cater both to beginners and seasoned professionals. It offers a comprehensive look into the foundational technologies and advanced techniques in the realm of LLMs. Whether you are new to programming or an experienced developer, you will find the content approachable yet enriching, especially with practical code examples to enhance your engagement.