Appendix
This appendix serves as a practical reference guide to the major LLM providers that integrate with LangChain. As you develop applications with the techniques covered throughout this book, you’ll need to connect to various model providers, each with its own authentication mechanisms, capabilities, and integration patterns.
We’ll first cover the detailed setup instructions for the major LLM providers, including OpenAI, Hugging Face, Google, and others. For each provider, we walk through the process of creating accounts, generating API keys, and configuring your development environment to use these services with LangChain. We then conclude with a practical implementation example that demonstrates how to process content exceeding an LLM’s context window—specifically, summarizing long videos using map-reduce techniques with LangChain. This pattern can be adapted for various scenarios where you need to process large volumes of text, audio transcripts...
