llamaindex
LlamaIndex
LlamaIndex (formerly GPT Index) connects LLMs to your data. 2025 introduces Workflows, an event-driven way to build complex RAG pipelines.
When to Use
- RAG (Retrieval Augmented Generation): Indexing PDFs, Docs, SQL to chat with them.
- Structured Data: Querying SQL/Pandas with natural language (
NLSQL). - Agents: Building research agents that browse the web and summarize.
Core Concepts
Workflows
Event-driven architecture for agents. Replace DAGs with event listeners (@step).
Query Engine
High-level API (index.as_query_engine()) to ask questions.
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