What is LangChain?

LangChain serves as a framework aimed at streamlining the development of applications utilizing Large language models. Functioning as a language model integration framework, LangChain's applications align closely with those of language models, spanning document analysis, summarization, chatbots, and code analysis.

What is LCEL?

LangChain Expression Language (LCEL) emerges as a declarative method within the LangChain framework, enabling effortless composition of chains. From its inception, LCEL prioritizes seamless transition from prototypes to production, accommodating a spectrum of complexities, from straightforward "prompt + LLM" sequences to intricate chains comprising hundreds of steps. Noteworthy features encompass streaming support for optimal time-to-first-token, asynchronous capabilities for versatile API usage, and optimized parallel execution for reduced latency. LCEL further offers configurations for retries, fallbacks, and access to intermediate results, enhancing reliability and debugging. Its integration with Pydantic and JSONSchema schemas ensures structured validation through input and output schemas, a fundamental aspect of LangServe. With built-in LangSmith tracing, LCEL provides comprehensive step-by-step logging for heightened observability. Even without opting for LangServe deployment, LCEL empowers users to effortlessly deploy chains, making it a versatile tool for various applications.

In this course you learn

- Langchain Basics

- Langchain Expression Language

- Chains

- Memory

- Agents and Tools

- RAG etc