tomevault-io LangChain RAG
Production RAG pipelines with LangChain — retrieval, generation, and evaluation.
Quick Start
from langchain_chroma import Chroma
from langchain_openai import OpenAIEmbeddings, ChatOpenAI
from langchain.chains import create_retrieval_chain
from langchain.chains.combine_documents import create_stuff_documents_chain
from langchain_core.prompts import ChatPromptTemplate
# Vector store
db = Chroma(persist_directory="./chroma_db", embedding_function=OpenAIEmbeddings())
# RAG chain
llm = ChatOpenAI(model="gpt-4o")
prompt = ChatPromptTemplate.from_template("Answer based on context: {context}\nQuestion: {input}")
doc_chain = create_stuff_documents_chain(llm, prompt)
rag_chain = create_retrieval_chain(db.as_retriever(search_kwargs={"k": 4}), doc_chain)
result = rag_chain.invoke({"input": "What is RAG?"})
print(result["answer"])
When to Use
- ✅ Question answering over documents
- ✅ Chat with your data (PDFs, wikis, databases)
- ❌ Not for simple Q&A without external knowledge
Step-by-Step Instructions
- Load and chunk documents
- Create embeddings and vector store
- Set up retriever with relevant parameters
- Create RAG chain with custom prompt
Dependencies
pip install langchain langchain-openai langchain-chroma
Examples
Input: "Summarize the key findings" → Output: Answer grounded in retrieved documents
Resources
Validation
- Retriever returns relevant documents
- LLM generates grounded answers
- Citations are accurate
Source: ssrjkk/claude-skills — distributed by TomeVault.