RAG-Fundamentals 🚀

Comprehensive Collection of Retrieval-Augmented Generation Techniques

A complete hands-on guide to RAG implementations, from basic concepts to advanced techniques. This repository contains practical notebooks demonstrating various RAG approaches, retrieval strategies, and optimization methods.

📊 RAG Architecture Flowchart

Based on the provided flowchart, here's the complete RAG system architecture:

graph TD
    A[📄 DATA] --> B[🔪 CHUNK 1]
    A --> C[🔪 CHUNK 2] 
    A --> D[🔪 CHUNK 3]
    
    B --> E[🧠 EMBEDDING 1]
    C --> F[🧠 EMBEDDING 2]
    D --> G[🧠 EMBEDDING 3]
    
    E --> H[💾 DATABASE<br/>Vector Store]
    F --> H
    G --> H
    
    I[👤 USER] --> J[🔎 QUERY]
    J --> K[🧠 EMBEDDING<br/>Query]
    
    I -.->|Generation| L[🔍 SEMANTIC SEARCH]
    K --> L
    H --> L
    
    L --> M[🎯 RETRIEVAL]
    M --> N[📊 RANKED RESULTS]
    N --> O[🔄 RERANKED RESULTS]
    
    O --> P[🤖 LLM<br/>Query+Prompt+Context]
    P --> Q[💬 RESPONSE]
    
    style A fill:#e1f5fe
    style H fill:#f3e5f5
    style I fill:#fff3e0
    style P fill:#e8f5e8
    style Q fill:#fce4ec

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Core RAG Components:

1. 📄 Data Processing: Documents are split into manageable chunks
2. 🧠 Embedding: Text chunks converted to vector representations
3. 💾 Vector Database: Stores embeddings for efficient retrieval
4. 🔍 Semantic Search: Finds relevant chunks using similarity
5. 🎯 Retrieval: Returns top-k most relevant documents
6. 🔄 Reranking: Optimizes order for better context
7. 🤖 LLM Generation: Produces final answer with retrieved context

🎯 What is RAG?

Retrieval-Augmented Generation combines the power of:

• 🔍 Information Retrieval: Finding relevant external knowledge
• 🤖 Language Generation: Creating contextual responses
• 📚 External Knowledge: Up-to-date, domain-specific information

📁 Repository Structure

🔰 Basic RAG

Foundation techniques for RAG implementation

Notebook	Purpose	Key Techniques
basic_rag.ipynb	Core RAG pipeline	Vector embeddings, semantic search, prompt engineering
document_rag.ipynb	PDF document processing	Local knowledge base, metadata handling
url_rag.ipynb	Web content RAG	Real-time retrieval, dynamic knowledge updates

🔍 Retriever Techniques

Advanced retrieval strategies beyond basic semantic search

Technique	Notebook	Innovation
Contextual Compression	Contextual_Compression_Retriever.ipynb	Compresses retrieved docs to extract only relevant portions
HyDE	Hypothetical_Document_Embedding_(HyDE).ipynb	Generates hypothetical answers to improve retrieval accuracy
Multi-Hop Retrieval	MultiHop_Query_Step_by_Step_Retrieval.ipynb	Step-by-step retrieval for complex queries
Parent Document	Parent_Document_Retriever.ipynb	Retrieves small chunks but returns larger parent documents
Self-Query	Self_Query_Retrieval.ipynb	Natural language query parsing with metadata filtering
Sentence Window	Sentence_Window_Retrieval.ipynb	Expanded context windows around relevant sentences

🏆 ReRanking Techniques

Optimize retrieved document ordering for better LLM performance

Method	Notebook	Advantage
BM25 Rerank	bm25_rerank_rag.ipynb	Statistical keyword-based relevance scoring
Cohere Rerank	cohere_rerank.ipynb	State-of-the-art neural reranking API
Cross-Encoder	cross_encoder_rerank.ipynb	Joint query-document encoding for precise relevance
Flash ReRank	Flash_ReRanking.ipynb	Ultra-fast reranking for real-time applications

🔗 Hybrid Search RAG

Combine multiple search methodologies for superior performance

Technique	Notebook	Combines
Cosine Similarity	cosine.ipynb	Vector similarity mathematics and optimization
Hybrid Search	hybridsearch-rag.ipynb	Semantic + keyword search with score fusion algorithms

⚡ RAG Fusion

Fuse multiple retrieval methods for comprehensive results

Method	Notebook	Fusion Strategy
Reciprocal Rank Fusion	ReciProcal_Rank_Fusion.ipynb	Combines rankings from multiple retrievers using RRF algorithm

🎯 Lost In Middle Problem

Solve positional bias where important info gets overlooked in middle context

Solution	Notebook	Approach
Merger & Reranking	MergerRetriever_And_Reranking.ipynb	Strategic document ordering and context reorganization

🖼️ MultiModal RAG

Process and understand multiple data types including text, images, charts, and diagrams

Technique	Notebook	Innovation
MultiModal Processing	MultiModal_RAG(IMG+TexT).ipynb	CLIP-based unified embeddings for text and images, cross-modal retrieval

🤖 Agentic RAG

Intelligent agent-based RAG systems with autonomous decision making

Method	Notebook	Capability
Agentic RAG	Agentic_RAG.ipynb	Autonomous agent-based retrieval and generation
LangGraph RAG	Rag_with_langgraph.ipynb	Graph-based workflow orchestration for complex RAG
Routed RAG	Routed_RAG_With_LLM_Router.ipynb	LLM-powered routing for dynamic retrieval strategies

🔬 Advanced RAG

Cutting-edge RAG techniques for specialized applications

Technique	Notebook	Advanced Feature
Agentic RAG	Agentic_RAG.ipynb	Agent-based autonomous reasoning and retrieval
Corrective RAG (CRAG)	Corrective_RAG_(CRAG).ipynb	Self-correcting retrieval with confidence scoring

📊 RAG Evaluation

Comprehensive evaluation frameworks for RAG system performance

Framework	Notebook	Evaluation Focus
RAG Evaluation	RAG_Evaluation.ipynb	Custom evaluation metrics and benchmarking
RAGAs Evaluation	RAGAs_Evaluation.ipynb	Automated evaluation using RAGAs framework

🔧 Key Technologies Used

• 🦜 LangChain: RAG framework and components
• 🤗 HuggingFace: Embeddings and transformers
• 📊 ChromaDB: Vector database storage
• 🔍 FAISS: Efficient similarity search
• 🌐 OpenAI: Embeddings and language models
• ⚡ Cohere: Professional reranking services
• 🖼️ CLIP: Multimodal embeddings for text and images
• 🔄 LangGraph: Graph-based workflow orchestration
• ⚖️ RAGAs: Automated RAG evaluation framework
• 🧠 Groq: High-performance LLM inference

🚀 Getting Started

1. Clone the repository
2. Install dependencies: pip install -r requirements.txt
3. Start with Basic RAG to understand fundamentals
4. Explore Retriever Techniques for advanced retrieval strategies
5. Implement ReRanking for better accuracy
6. Try Hybrid Approaches for production systems
7. Explore MultiModal RAG for documents with images and text
8. Advance to Agentic RAG for autonomous intelligent systems
9. Use RAG Evaluation to benchmark and optimize performance

🎯 Use Cases Covered

• 📖 Document Q&A: Academic papers, legal documents
• 🌐 Web Search: Real-time information retrieval
• 🏢 Enterprise: Knowledge management systems
• 🔬 Research: Multi-document analysis and synthesis
• 💬 Chatbots: Context-aware conversational AI
• 🖼️ Multimodal Analysis: Documents with text, images, and charts
• 🤖 Autonomous Systems: Agent-based intelligent retrieval
• 📊 Performance Evaluation: RAG system benchmarking and optimization
• 🔄 Self-Correcting Systems: Adaptive and corrective RAG implementations

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🎯 Master RAG: From basic retrieval to advanced fusion techniques, this repository provides everything needed to build Development-ready RAG systems.