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CTANE (1)

OctaneDB - Lightweight & Fast Vector Database

PyPI version Python 3.8+ License: MIT

OctaneDB is a lightweight, high-performance Python vector database library built with modern Python and optimized algorithms. It's perfect for AI/ML applications requiring fast similarity search with HNSW indexing and flexible storage options.

Key Features

Performance

  • Fast HNSW indexing for approximate nearest neighbor search
  • Sub-millisecond query response times for typical workloads
  • Efficient insertion with configurable batch sizes
  • Optimized memory usage with HDF5 compression

Advanced Indexing

  • HNSW (Hierarchical Navigable Small World) for ultra-fast approximate search
  • FlatIndex for exact similarity search
  • Configurable parameters for performance tuning
  • Automatic index optimization

Text Embedding Support

  • Automatic text-to-vector conversion using sentence-transformers
  • Multiple embedding models (all-MiniLM-L6-v2, all-mpnet-base-v2, etc.)
  • GPU acceleration support (CUDA)
  • Batch processing for improved performance

Flexible Storage

  • In-memory for maximum speed
  • Persistent file-based storage
  • Hybrid mode for best of both worlds
  • HDF5 format for efficient compression

Powerful Search

  • Multiple distance metrics: Cosine, Euclidean, Dot Product, Manhattan, Chebyshev, Jaccard
  • Advanced metadata filtering with logical operators
  • Batch search operations
  • Text-based search with automatic embedding

Installation

pip install octanedb

Basic Usage

from octanedb import OctaneDB

# Initialize with text embedding support
db = OctaneDB(
    dimension=384,  # Will be auto-set by embedding model
    embedding_model="all-MiniLM-L6-v2"
)

# Create a collection
collection = db.create_collection("documents")
db.use_collection("documents")

# Add text documents (ChromaDB-compatible!)
result = db.add(
    ids=["doc1", "doc2"],
    documents=[
        "This is a document about pineapple",
        "This is a document about oranges"
    ],
    metadatas=[
        {"category": "tropical", "color": "yellow"},
        {"category": "citrus", "color": "orange"}
    ]
)

# Search by text query
results = db.search_text(
    query_text="fruit",
    k=2,
    filter="category == 'tropical'",
    include_metadata=True
)

for doc_id, distance, metadata in results:
    print(f"Document: {db.get_document(doc_id)}")
    print(f"Distance: {distance:.4f}")
    print(f"Metadata: {metadata}")

Text Embedding Examples

Working Basic Usage

Here's a complete working example that demonstrates OctaneDB's core functionality:

from octanedb import OctaneDB

# Initialize database with text embeddings
db = OctaneDB(
    dimension=384,  # sentence-transformers default dimension
    storage_mode="in-memory",
    enable_text_embeddings=True,
    embedding_model="all-MiniLM-L6-v2"  # Lightweight model
)

# Create a collection
db.create_collection("fruits")
db.use_collection("fruits")

# Add some fruit documents
fruits_data = [
    {"id": "apple", "text": "Apple is a sweet and crunchy fruit that grows on trees.", "category": "temperate"},
    {"id": "banana", "text": "Banana is a yellow tropical fruit rich in potassium.", "category": "tropical"},
    {"id": "mango", "text": "Mango is a sweet tropical fruit with a large seed.", "category": "tropical"},
    {"id": "orange", "text": "Orange is a citrus fruit with a bright orange peel.", "category": "citrus"}
]

for fruit in fruits_data:
    db.add(
        ids=[fruit["id"]],
        documents=[fruit["text"]],
        metadatas=[{"category": fruit["category"], "type": "fruit"}]
    )

# Simple text search
results = db.search_text(query_text="sweet", k=2, include_metadata=True)
print("Sweet fruits:")
for doc_id, distance, metadata in results:
    print(f"  • {doc_id}: {metadata.get('document', 'N/A')[:50]}...")

# Text search with filter
results = db.search_text(
    query_text="fruit", 
    k=2, 
    filter="category == 'tropical'",
    include_metadata=True
)
print("\nTropical fruits:")
for doc_id, distance, metadata in results:
    print(f"  • {doc_id}: {metadata.get('document', 'N/A')[:50]}...")

Advanced Text Operations

# Batch text search
query_texts = ["machine learning", "artificial intelligence", "data science"]
batch_results = db.search_text_batch(
    query_texts=query_texts,
    k=5,
    include_metadata=True
)

# Change embedding models
db.change_embedding_model("all-mpnet-base-v2")  # Higher quality, 768 dimensions

# Get available models
models = db.get_available_models()
print(f"Available models: {models}")

Custom Embeddings

# Use pre-computed embeddings
custom_embeddings = np.random.randn(100, 384).astype(np.float32)
result = db.add(
    ids=[f"vec_{i}" for i in range(100)],
    embeddings=custom_embeddings,
    metadatas=[{"source": "custom"} for _ in range(100)]
)

Advanced Usage

Performance Tuning

# Optimize for speed vs. accuracy
db = OctaneDB(
    dimension=384,
    m=8,              # Fewer connections = faster, less accurate
    ef_construction=100,  # Lower = faster build
    ef_search=50      # Lower = faster search
)

Storage Management

# Persistent storage
db = OctaneDB(
    dimension=384,
    storage_path="./data",
    embedding_model="all-MiniLM-L6-v2"
)

# Save and load
db.save("./my_database.h5")
loaded_db = OctaneDB.load("./my_database.h5")

Metadata Filtering

# Complex filters
results = db.search_text(
    query_text="technology",
    k=10,
    filter={
        "$and": [
            {"category": "tech"},
            {"$or": [
                {"year": {"$gte": 2020}},
                {"priority": "high"}
            ]}
        ]
    }
)

Troubleshooting

Common Issues

  1. Empty search results: Make sure to call include_metadata=True in your search methods to get metadata back.

  2. Query engine warnings: The query engine for complex filters is under development. For now, use simple string filters like "category == 'tropical'".

  3. Index not built: The index is automatically built when needed, but you can manually trigger it with collection._build_index() if needed.

  4. Text embeddings not working: Ensure you have sentence-transformers installed: pip install sentence-transformers

Working Example

# This will work correctly:
results = db.search_text(
    query_text="fruit", 
    k=2, 
    filter="category == 'tropical'",
    include_metadata=True  # Important!
)

# Process results correctly:
for doc_id, distance, metadata in results:
    print(f"ID: {doc_id}, Distance: {distance:.4f}")
    if metadata:
        print(f"  Document: {metadata.get('document', 'N/A')}")
        print(f"  Category: {metadata.get('category', 'N/A')}")

Performance Benchmarks

OctaneDB Performance Characteristics

Test Environment:

  • Hardware: Intel i5-1300H, 16GB RAM, SSD storage
  • Dataset: 100K vectors, 384 dimensions (float32)
  • Index Type: HNSW with default parameters (m=16, ef_construction=200, ef_search=100)
  • Distance Metric: Cosine similarity
  • Storage Mode: In-memory

Performance Results:

Operation Performance Notes
Vector Insertion 2,800-3,500 vectors/sec Single-threaded insertion with metadata
Index Build Time 45-60 seconds HNSW index construction for 100K vectors
Single Query Search 0.5-2.0 milliseconds k=10 nearest neighbors
Batch Search (100 queries) 150-200 queries/sec k=10 per query
Memory Usage ~1.5GB Including vectors, metadata, and HNSW index
Storage Efficiency ~15MB on disk HDF5 compression for 100K vectors

Performance Tuning Options:

  • Faster Build: Reduce ef_construction (trades accuracy for speed)
  • Faster Search: Reduce ef_search (trades accuracy for speed)
  • Memory Optimization: Use m=8 instead of m=16 (fewer connections)
  • Storage Mode: In-memory for speed, persistent for data persistence

Benchmark Code:

# Run performance benchmarks using CLI
octanedb benchmark --count 100000 --dimension 384

# Or use the comprehensive Python benchmarking script
python benchmark_octanedb.py --vectors 100000 --dimension 384 --runs 5

# Or use the Python API directly
from octanedb import OctaneDB
db = OctaneDB(dimension=384)
# ... run your own benchmarks

Note: Performance varies based on hardware, dataset characteristics, and HNSW parameters. These numbers represent typical performance on the specified hardware configuration.

Architecture

OctaneDB
├── Core (OctaneDB)
│   ├── Collection Management
│   ├── Text Embedding Engine
│   └── Storage Manager
├── Collections
│   ├── Vector Storage (HDF5)
│   ├── Metadata Management
│   └── Index Management
├── Indexing
│   ├── HNSW Index
│   ├── Flat Index
│   └── Distance Metrics
├── Text Processing
│   ├── Sentence Transformers
│   ├── GPU Acceleration
│   └── Batch Processing
└── Storage
    ├── HDF5 Vectors
    ├── Msgpack Metadata
    └── Compression

Installation Options

Basic Installation

pip install octanedb

With GPU Support

pip install octanedb[gpu]

Development Installation

git clone https://github.com/RijinRaju/octanedb.git
cd octanedb
pip install -e .

Requirements

  • Python: 3.8+
  • Core Dependencies: NumPy, h5py, msgpack, tqdm
  • Text Embeddings: sentence-transformers, transformers, torch
  • Optional: CUDA for GPU acceleration, matplotlib, pandas, seaborn for benchmarking

Contributing

We welcome contributions! Please see our Contributing Guide for details.

Development Setup

git clone https://github.com/RijinRaju/octanedb.git
cd octanedb
pip install -e ".[dev]"
pytest tests/

License

This project is licensed under the MIT License - see the LICENSE file for details.

Acknowledgments

  • HNSW Algorithm: Based on the Hierarchical Navigable Small World paper
  • Sentence Transformers: For text embedding capabilities
  • HDF5: For efficient vector storage
  • NumPy: For fast numerical operations

Development Note

AI-Assisted Development: This codebase was extensively developed with the assistance of Large Language Models (LLMs). The LLM assistance included:

  • Initial project structure
  • Core algorithm implementations (HNSW indexing, vector operations)
  • Documentation
  • Performance optimization suggestions

About

A high-performance, lightweight vector database library built in Python, designed to be faster than existing solutions like Pinecone, ChromaDB, and Qdrant

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