Matryoshka Text Embedding v1

A multilingual text embedding model with Matryoshka Representation Learning, allowing flexible embedding dimensions from 64D to 1024D.

Model Overview

This model implements Matryoshka Representation Learning, enabling you to truncate embeddings to different dimensions while maintaining good performance. This allows you to balance accuracy, speed, and storage based on your specific needs.

Key Features

Flexible Dimensions: Choose from 7 different embedding sizes (64D, 128D, 256D, 384D, 512D, 768D, 1024D)
Multilingual Support: Trained on 100+ languages
Base Architecture: XLM-RoBERTa
Max Sequence Length: 8192 tokens

Quick Start

Installation

pip install sentence-transformers

Basic Usage

from sentence_transformers import SentenceTransformer

# Load model
model = SentenceTransformer('matryoshka-text-embedding-v1')

# Full precision (1024D)
embeddings = model.encode(["Your text here"])

# Balanced mode (512D) - Recommended for most use cases
embeddings = model.encode(["Your text here"], truncate_dim=512)

# Fast mode (256D) - For high-throughput applications
embeddings = model.encode(["Your text here"], truncate_dim=256)

# Ultra-fast mode (128D) - For real-time applications
embeddings = model.encode(["Your text here"], truncate_dim=128)

Performance Benchmarks

SciFact (Scientific Document Retrieval)

Dimension	NDCG@10	Relative Performance
1024D	0.6308	100.0%
768D	0.6277	99.5%
512D	0.6114	96.9%
384D	0.6035	95.7%
256D	0.5614	89.0%
128D	0.4732	75.0%
64D	0.3317	52.6%

STSBenchmark (English Semantic Similarity)

Spearman: 0.8506 (1024D)
Pearson: 0.8381 (1024D)

STS17 (Multilingual Semantic Similarity)

Average Spearman Correlation across languages: 0.8096

Performance by language pair (1024D):

Spanish (es-es): 0.8808
English (en-en): 0.8740
German (en-de): 0.8245
Korean (ko-ko): 0.8210
French (fr-en): 0.8157
Italian (it-en): 0.8152
Dutch (nl-en): 0.8190
Arabic (ar-ar): 0.8056
Turkish (en-tr): 0.7484
Spanish-English (es-en): 0.7660
English-Arabic (en-ar): 0.7191

Use Cases

High Accuracy Applications (768D-1024D)

Scientific literature search
Legal document retrieval
Medical information systems

Balanced Production (512D) - Recommended

General web search
E-commerce product search
Content recommendation engines
Knowledge base retrieval

High-Throughput Systems (256D-384D)

Real-time search APIs
Large-scale document indexing
Social media search

Mobile & Edge Devices (64D-128D)

Mobile applications
IoT devices
Browser-based search
Resource-constrained environments

Advanced Usage

Semantic Search

import numpy as np
from sentence_transformers import util

# Index documents with 512D (optimal balance)
documents = [
    "Artificial intelligence is transforming healthcare.",
    "Machine learning models require large datasets.",
    "Quantum computing promises exponential speedups."
]

doc_embeddings = model.encode(documents, truncate_dim=512)

# Search with same dimension
query = "How is AI used in medicine?"
query_embedding = model.encode(query, truncate_dim=512)

# Compute similarities
similarities = util.cos_sim(query_embedding, doc_embeddings)
top_result = np.argmax(similarities)

print(f"Most relevant: {documents[top_result]}")

Integration with FAISS

import faiss
import numpy as np

# Create embeddings with 512D
embeddings = model.encode(documents, truncate_dim=512)
embeddings = embeddings.astype('float32')

# Build FAISS index
dimension = 512
index = faiss.IndexFlatIP(dimension)
faiss.normalize_L2(embeddings)
index.add(embeddings)

# Search
query_embedding = model.encode(query, truncate_dim=512).astype('float32')
faiss.normalize_L2(query_embedding.reshape(1, -1))
distances, indices = index.search(query_embedding.reshape(1, -1), k=10)

Technical Details

Architecture

Base: XLM-RoBERTa transformer encoder
Embedding Dimensions: 1024 (full) with 7 supported truncation levels
Max Sequence Length: 8192 tokens
Vocabulary Size: 250,002 tokens
Parameters: ~568M

Training

Technique: Matryoshka Representation Learning
Languages: 100+ languages
Max Input Length: 8192 tokens

Model Files

pytorch_model.bin - Model weights
config.json - Model configuration
tokenizer.json - Tokenizer configuration
lumees_config.json - Matryoshka-specific configuration

License

This model is released under the CC-BY-NC-4.0 (Creative Commons Attribution-NonCommercial 4.0 International) license.

See the LICENSE file for full details and acknowledgments.

Acknowledgments

This model builds upon important foundational work:

XLM-RoBERTa: Base architecture for multilingual representations
BAAI: For their contributions through RetroMAE and BGE-M3 papers
Matryoshka Representation Learning: Training methodology (Kusupati et al., 2022)

Citation

If you use this model in your research or application, please cite:

@misc{matryoshka-text-embedding-v1,
  title={Matryoshka Text Embedding v1},
  author={Hasan Kurşun and Kerem Berkay Yanık},
  year={2025},
  url={https://huggingface.co/lumees/lumees-matryoshka-embedding-v1},
  organization={Lumees},
  contact={[email protected]},
  website={https://lumees.io}
}