Feast provides robust support for Generative AI applications, enabling teams to build, deploy, and manage feature infrastructure for Large Language Models (LLMs) and other Generative AI (GenAI) applications. With Feast's vector database integrations and feature management capabilities, teams can implement production-ready Retrieval Augmented Generation (RAG) systems and other GenAI applications with the same reliability and operational excellence as traditional ML systems.

Feast integrates with popular vector databases to store and retrieve embedding vectors efficiently:

• Milvus: Full support for vector similarity search with the retrieve_online_documents_v2 method
• SQLite: Local vector storage and retrieval for development and testing
• Elasticsearch: Scalable vector search capabilities
• Postgres with PGVector: SQL-based vector operations
• Qdrant: Purpose-built vector database integration

These integrations allow you to:

• Store embeddings as features
• Perform vector similarity search to find relevant context
• Retrieve both vector embeddings and traditional features in a single API call

Feast simplifies building RAG applications by providing:

1. Embedding storage: Store and version embeddings alongside your other features
2. Vector similarity search: Find the most relevant data/documents for a given query
3. Feature retrieval: Combine embeddings with structured features for richer context
4. Versioning and governance: Track changes to your document repository over time

The typical RAG workflow with Feast involves:

┌─────────────┐     ┌─────────────┐     ┌─────────────┐     ┌─────────────┐
│  Document   │     │  Document   │     │    Feast    │     │     LLM     │
│  Processing │────▶│  Embedding  │────▶│   Feature   │────▶│   Context   │
│             │     │             │     │    Store    │     │  Generation  │
└─────────────┘     └─────────────┘     └─────────────┘     └─────────────┘

Feast provides powerful capabilities for transforming unstructured data (like PDFs, text documents, and images) into structured embeddings that can be used for RAG applications:

• Document Processing Pipelines: Integrate with document processing tools like Docling to extract text from PDFs and other document formats
• Chunking and Embedding Generation: Process documents into smaller chunks and generate embeddings using models like Sentence Transformers
• On-Demand Transformations: Use @on_demand_feature_view decorator to transform raw documents into embeddings in real-time
• Batch Processing with Spark: Scale document processing for large datasets using Spark integration

The transformation workflow typically involves:

1. Raw Data Ingestion: Load documents or other data from various sources (file systems, databases, etc.)
2. Text Extraction: Extract text content from unstructured documents
3. Chunking: Split documents into smaller, semantically meaningful chunks
4. Embedding Generation: Convert text chunks into vector embeddings
5. Storage: Store embeddings and metadata in Feast's feature store

Feast supports transformations that can be used to:

• Process raw text into embeddings
• Chunk documents for more effective retrieval
• Normalize and preprocess features before serving to LLMs
• Apply custom transformations to adapt features for specific LLM requirements

Build document Q&A systems by:

1. Storing document chunks and their embeddings in Feast
2. Converting user questions to embeddings
3. Retrieving relevant document chunks
4. Providing these chunks as context to an LLM

Enhance your LLM's knowledge by:

1. Storing company-specific information as embeddings
2. Retrieving relevant information based on user queries
3. Injecting this information into the LLM's context

Implement semantic search by:

1. Storing document embeddings in Feast
2. Converting search queries to embeddings
3. Finding semantically similar documents using vector search

Feast integrates with Apache Spark to enable large-scale processing of unstructured data for GenAI applications:

• Spark Data Source: Load data from Spark tables, files, or SQL queries for feature generation
• Spark Offline Store: Process large document collections and generate embeddings at scale
• Spark Batch Materialization: Efficiently materialize features from offline to online stores
• Distributed Processing: Handle gigabytes of documents and millions of embeddings

This integration enables:

• Processing large document collections in parallel
• Generating embeddings for millions of text chunks
• Efficiently materializing features to vector databases
• Scaling RAG applications to enterprise-level document repositories

Feast integrates with Ray to enable distributed processing for RAG applications:

• Ray Compute Engine: Distributed feature computation using Ray's task and actor model
• Ray Offline Store: Process large document collections and generate embeddings at scale
• Ray Batch Materialization: Efficiently materialize features from offline to online stores
• Distributed Embedding Generation: Scale embedding generation across multiple nodes

This integration enables:

• Distributed processing of large document collections
• Parallel embedding generation for millions of text chunks
• Kubernetes-native scaling for RAG applications
• Efficient resource utilization across multiple nodes
• Production-ready distributed RAG pipelines

For detailed information on building distributed RAG applications with Feast and Ray, see Feast + Ray: Distributed Processing for RAG Applications.

Feast supports the Model Context Protocol (MCP), which enables AI agents and applications to interact with your feature store through standardized MCP interfaces. This allows seamless integration with LLMs and AI agents for GenAI applications.

• Standardized AI Integration: Enable AI agents to discover and use features dynamically without hardcoded definitions
• Easy Setup: Add MCP support with a simple configuration change and pip install feast[mcp]
• Agent-Friendly APIs: Expose feature store capabilities through MCP tools that AI agents can understand and use
• Production Ready: Built on top of Feast's proven feature serving infrastructure

1. Install MCP support:

   pip install feast[mcp]

2. Configure your feature store to use MCP:

   feature_server:
     type: mcp
     enabled: true
     mcp_enabled: true
     mcp_server_name: "feast-feature-store"
     mcp_server_version: "1.0.0"

The MCP integration uses the fastapi_mcp library to automatically transform your Feast feature server's FastAPI endpoints into MCP-compatible tools. When you enable MCP support:

1. Automatic Discovery: The integration scans your FastAPI application and discovers all available endpoints
2. Tool Generation: Each endpoint becomes an MCP tool with auto-generated schemas and descriptions
3. Dynamic Access: AI agents can discover and call these tools dynamically without hardcoded definitions
4. Standard Protocol: Uses the Model Context Protocol for standardized AI-to-API communication

The fastapi_mcp integration automatically exposes your Feast feature server's FastAPI endpoints as MCP tools. This means AI assistants can:

• Call /get-online-features to retrieve features from the feature store
• Use /health to check server status

For a complete example, see the MCP Feature Store Example.

For more detailed information and examples:

• Vector Database Reference
• RAG Tutorial with Docling
• RAG Fine Tuning with Feast and Milvus
• Milvus Quickstart Example
• Feast + Ray: Distributed Processing for RAG Applications
• MCP Feature Store Example
• MCP Feature Server Reference
• Spark Data Source
• Spark Offline Store
• Spark Compute Engine