Build a RAG Using LangChain with Google Gemini

In this project, we'll build a retrieval-augmented generation (RAG) system using LangChain and Google Gemini Pro to create an intelligent text generation application that grounds AI responses in uploaded documents. LangChain is an open-source framework for developing large language model (LLM) applications including chatbots, content generators, and question-answering systems. We'll explore prompt engineering, chat history management, model parameter tuning, and RAG implementation to enhance Google Gemini's text generation capabilities with factual document retrieval.

We'll start by integrating the Google Gemini API and crafting prompts for text generation tasks, then implement conversational interactions with chat history tracking to maintain context across multiple turns. Next, we'll experiment with critical hyperparameters including temperature for creativity control, max_output_tokens for response length, top_k sampling and top_p for diversity, and candidate_count for generating multiple response options. This parameter optimization process demonstrates how to fine-tune LLM behavior for specific use cases.

Finally, we'll build the RAG pipeline by loading PDF documents, extracting text content, and creating vector embeddings using Google Gemini's embedding model. We'll construct a RAG chain that retrieves relevant document chunks based on user queries and feeds them to the LLM for context-aware answer generation. By the end, we'll have a production-ready RAG application demonstrating LangChain framework usage, Google Gemini integration, document parsing, embedding generation, vector search, and prompt engineering applicable to any AI-powered content generation system.