WordLlama
Things you can do with the token embeddings of an LLM
Stars: 1407
WordLlama is a fast, lightweight NLP toolkit optimized for CPU hardware. It recycles components from large language models to create efficient word representations. It offers features like Matryoshka Representations, low resource requirements, binarization, and numpy-only inference. The tool is suitable for tasks like semantic matching, fuzzy deduplication, ranking, and clustering, making it a good option for NLP-lite tasks and exploratory analysis.
README:
WordLlama is a fast, lightweight NLP toolkit designed for tasks like fuzzy deduplication, similarity computation, ranking, clustering, and semantic text splitting. It operates with minimal inference-time dependencies and is optimized for CPU hardware, making it suitable for deployment in resource-constrained environments.
- 2025-01-04 We're excited to announce support for model2vec static embeddings. See also: Model2Vec
- 2024-10-04 Added semantic splitting inference algorithm. See our technical overview.
- Quick Start
- Features
- What is WordLlama?
- MTEB Results
- How Fast?
- Usage
- Training Notes
- Roadmap
- Extracting Token Embeddings
- Community Projects
- Citations
- License
Install WordLlama via pip:
pip install wordllamaLoad the default 256-dimensional model:
from wordllama import WordLlama
# Load the default WordLlama model
wl = WordLlama.load()
# Calculate similarity between two sentences
similarity_score = wl.similarity("I went to the car", "I went to the pawn shop")
print(similarity_score) # Output: e.g., 0.0664
# Rank documents based on their similarity to a query
query = "I went to the car"
candidates = ["I went to the park", "I went to the shop", "I went to the truck", "I went to the vehicle"]
ranked_docs = wl.rank(query, candidates)
print(ranked_docs)
# Output:
# [
# ('I went to the vehicle', 0.7441),
# ('I went to the truck', 0.2832),
# ('I went to the shop', 0.1973),
# ('I went to the park', 0.1510)
# ]- Fast Embeddings: Efficiently generate text embeddings using a simple token lookup with average pooling.
- Similarity Computation: Calculate cosine similarity between texts.
- Ranking: Rank documents based on their similarity to a query.
- Fuzzy Deduplication: Remove duplicate texts based on a similarity threshold.
- Clustering: Cluster documents into groups using KMeans clustering.
- Filtering: Filter documents based on their similarity to a query.
- Top-K Retrieval: Retrieve the top-K most similar documents to a query.
- Semantic Text Splitting: Split text into semantically coherent chunks.
- Binary Embeddings: Support for binary embeddings with Hamming similarity for even faster computations.
- Matryoshka Representations: Truncate embedding dimensions as needed for flexibility.
- Low Resource Requirements: Optimized for CPU inference with minimal dependencies.
WordLlama is a utility for natural language processing (NLP) that recycles components from large language models (LLMs) to create efficient and compact word representations, similar to GloVe, Word2Vec, or FastText.
Starting by extracting the token embedding codebook from state-of-the-art LLMs (e.g., LLaMA 2, LLaMA 3 70B), WordLlama trains a small context-less model within a general-purpose embedding framework. This approach results in a lightweight model that improves on all MTEB benchmarks over traditional word models like GloVe 300d, while being substantially smaller in size (e.g., 16MB default model at 256 dimensions).
WordLlama's key features include:
- Matryoshka Representations: Allows for truncation of the embedding dimension as needed, providing flexibility in model size and performance.
- Low Resource Requirements: Utilizes a simple token lookup with average pooling, enabling fast operation on CPUs without the need for GPUs.
- Binary Embeddings: Models trained using the straight-through estimator can be packed into small integer arrays for even faster Hamming distance calculations.
- Numpy-only Inference: Lightweight inference pipeline relying solely on NumPy, facilitating easy deployment and integration.
Because of its fast and portable size, WordLlama serves as a versatile tool for exploratory analysis and utility applications, such as LLM output evaluators or preparatory tasks in multi-hop or agentic workflows.
The following table presents the performance of WordLlama models compared to other similar models.
| Metric | WL64 | WL128 | WL256 (X) | WL512 | WL1024 | GloVe 300d | Komninos | all-MiniLM-L6-v2 |
|---|---|---|---|---|---|---|---|---|
| Clustering | 30.27 | 32.20 | 33.25 | 33.40 | 33.62 | 27.73 | 26.57 | 42.35 |
| Reranking | 50.38 | 51.52 | 52.03 | 52.32 | 52.39 | 43.29 | 44.75 | 58.04 |
| Classification | 53.14 | 56.25 | 58.21 | 59.13 | 59.50 | 57.29 | 57.65 | 63.05 |
| Pair Classification | 75.80 | 77.59 | 78.22 | 78.50 | 78.60 | 70.92 | 72.94 | 82.37 |
| STS | 66.24 | 67.53 | 67.91 | 68.22 | 68.27 | 61.85 | 62.46 | 78.90 |
| CQA DupStack | 18.76 | 22.54 | 24.12 | 24.59 | 24.83 | 15.47 | 16.79 | 41.32 |
| SummEval | 30.79 | 29.99 | 30.99 | 29.56 | 29.39 | 28.87 | 30.49 | 30.81 |
WL64 to WL1024: WordLlama models with embedding dimensions ranging from 64 to 1024.
Note: The l2_supercat is a LLaMA 2 vocabulary model. To train this model, we concatenated codebooks from several models, including LLaMA 2 70B and phi 3 medium, after removing additional special tokens. Because several models have used the LLaMA 2 tokenizer, their codebooks can be concatenated and trained together. The performance of the resulting model is comparable to training the LLaMA 3 70B codebook, while being 4x smaller (32k vs. 128k vocabulary).
- LLaMA 3-based: l3_supercat
- Results
8k documents from the ag_news dataset
- Single core performance (CPU), i9 12th gen, DDR4 3200
- NVIDIA A4500 (GPU)
Load pre-trained embeddings and embed text:
from wordllama import WordLlama
# Load pre-trained embeddings (truncate dimension to 64)
wl = WordLlama.load(trunc_dim=64)
# Embed text
embeddings = wl.embed(["The quick brown fox jumps over the lazy dog", "And all that jazz"])
print(embeddings.shape) # Output: (2, 64)Compute the similarity between two texts:
similarity_score = wl.similarity("I went to the car", "I went to the pawn shop")
print(similarity_score) # Output: e.g., 0.0664Rank documents based on their similarity to a query:
query = "I went to the car"
candidates = ["I went to the park", "I went to the shop", "I went to the truck", "I went to the vehicle"]
ranked_docs = wl.rank(query, candidates, sort=True, batch_size=64)
print(ranked_docs)
# Output:
# [
# ('I went to the vehicle', 0.7441),
# ('I went to the truck', 0.2832),
# ('I went to the shop', 0.1973),
# ('I went to the park', 0.1510)
# ]Remove duplicate texts based on a similarity threshold:
deduplicated_docs = wl.deduplicate(candidates, return_indices=False, threshold=0.5)
print(deduplicated_docs)
# Output:
# ['I went to the park',
# 'I went to the shop',
# 'I went to the truck']Cluster documents into groups using KMeans clustering:
labels, inertia = wl.cluster(candidates, k=3, max_iterations=100, tolerance=1e-4, n_init=3)
print(labels, inertia)
# Output:
# [2, 0, 1, 1], 0.4150Filter documents based on their similarity to a query:
filtered_docs = wl.filter(query, candidates, threshold=0.3)
print(filtered_docs)
# Output:
# ['I went to the vehicle']Retrieve the top-K most similar documents to a query:
top_docs = wl.topk(query, candidates, k=2)
print(top_docs)
# Output:
# ['I went to the vehicle', 'I went to the truck']Split text into semantic chunks:
long_text = "Your very long text goes here... " * 100
chunks = wl.split(long_text, target_size=1536)
print(list(map(len, chunks)))
# Output: [1055, 1055, 1187]Note that the target size is also the maximum size. The .split() feature attempts to aggregate sections up to the target_size,
but will retain the order of the text as well as sentence and, as much as possible, paragraph structure.
It uses wordllama embeddings to locate more natural indexes to split on. As a result, there will be a range of chunk sizes in the output
up to the target size.
The recommended target size is from 512 to 2048 characters, with the default size at 1536. Chunks that need to be much larger should probably be batched after splitting, and will often be aggregated from multiple semantic chunks already.
For more information see: technical overview
wl = WordLlama.list_configs()
# dict of config names
wl = WordLlama.load_m2v("potion_base_8m") # 256-dim model
wl = WordLlama.load_m2v("m2v_multilingual") # multilingual modelModel2Vec is a different way of creating static embeddings using PCA. Notably, they have produced multilingual models, and glove-based models, which score well in word similarity tasks.
Check them out on huggingface! minishlab
from wordllama import WordLlamaInference
from tokenizers import Tokenizer
tokenizer = Tokenizer.from_pretrained(...)
wl = WordLlamaInference(np_embeddings_ar, tokenizer)The inference class can be used directly with a bring-your-own static embeddings array (n_vocab, dim), rather than using the loader.
Binary embedding models showed more pronounced improvement at higher dimensions, and either 512 or 1024 dimensions are recommended for binary embeddings.
The L2 Supercat model was trained using a batch size of 512 on a single A100 GPU for 12 hours.
-
Additional Example Notebooks:
- DSPy evaluators
- Retrieval-Augmented Generation (RAG) pipelines
To extract token embeddings from a model, ensure you have agreed to the user agreement and logged in using the Hugging Face CLI (for LLaMA models). You can then use the following snippet:
from wordllama.extract.extract_safetensors import extract_safetensors
# Extract embeddings for the specified configuration
extract_safetensors("llama3_70B", "path/to/saved/model-0001-of-00XX.safetensors")Hint: Embeddings are usually in the first safetensors file, but not always. Sometimes there is a manifest; sometimes you have to inspect and figure it out.
For training, use the scripts in the GitHub repository. You have to add a configuration file (copy/modify an existing one into the folder).
pip install wordllama[train]
python train.py train --config your_new_config
# (Training process begins)
python train.py save --config your_new_config --checkpoint ... --outdir /path/to/weights/
# (Saves one model per Matryoshka dimension)If you use WordLlama in your research or project, please consider citing it as follows:
@software{miller2024wordllama,
author = {Miller, D. Lee},
title = {WordLlama: Recycled Token Embeddings from Large Language Models},
year = {2024},
url = {https://github.com/dleemiller/wordllama},
version = {0.3.7}
}This project is licensed under the MIT License.
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