Qwen3-Embedding-0.6B-onnx-int4

This is an onnx version of https://huggingface.co/Qwen/Qwen3-Embedding-0.6B

This model has been dynamically quantized to int4/uint8, and further modified to output a uint8 1024 dim tensor.

You probably don't want to use this model on CPU. I've tested on a Ryzen CPU with VNNI, and it's the same speed as the base f32 model, but with 2% less retrieval accuracy. I'm posting it here in case it's useful for GPU users. Not sure if it actually is, but I already made it so here it is.

This model is compatible with qdrant fastembed, please note these details:

• Execute model without pooling and without normalization
• Pay attention to the example query format in the code below

Quantization method

I did an int4 quantization pass with block size == 128 (block size 32 was extremely close in accuracy), with the same nodes excluded as from my uint8 model.

Then I quantized the remaining non-excluded nodes to uint8 the same way as here: https://huggingface.co/electroglyph/Qwen3-Embedding-0.6B-onnx-uint8

Here are the nodes I excluded

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Benchmarks

Speed

Method = Big chunk of text x10 runs

Seconds elapsed for dynamic_int4.onnx: 45.37 (this model)

Seconds elapsed for opt_f32.onnx: 46.07 (base f32 model preprocessed for quantization)

Seconds elapsed for dynamic_uint8.onnx: 34.61 (probably the one you want to use on CPU)

Verdict: This model kinda sucks on CPU. Let me know how it is on GPU please.

Accuracy

I used beir-qdrant with the scifact dataset.

This retrieval benchmark isn't the greatest result.

I welcome any additional benchmarks by the community, please feel free to share any further results.

If someone wants to sponsor me with an NVIDIA GPU I can have a much faster turnaround time with my model experiments and explore some different quantization strategies.

onnx f32 model with f32 output (baseline):

ndcg: {'NDCG@1': 0.57, 'NDCG@3': 0.65655, 'NDCG@5': 0.68177, 'NDCG@10': 0.69999, 'NDCG@100': 0.72749, 'NDCG@1000': 0.73301}
recall: {'Recall@1': 0.53828, 'Recall@3': 0.71517, 'Recall@5': 0.77883, 'Recall@10': 0.83056, 'Recall@100': 0.95333, 'Recall@1000': 0.99667}
precision: {'P@1': 0.57, 'P@3': 0.26111, 'P@5': 0.17467, 'P@10': 0.09467, 'P@100': 0.01083, 'P@1000': 0.00113}

onnx dynamic int4/uint8 model with f32 output (this model's parent):

ndcg: {'NDCG@1': 0.55333, 'NDCG@3': 0.6491, 'NDCG@5': 0.6674, 'NDCG@10': 0.69277, 'NDCG@100': 0.7183, 'NDCG@1000': 0.72434}
recall: {'Recall@1': 0.52161, 'Recall@3': 0.71739, 'Recall@5': 0.7645, 'Recall@10': 0.83656, 'Recall@100': 0.95, 'Recall@1000': 0.99667}
precision: {'P@1': 0.55333, 'P@3': 0.26222, 'P@5': 0.17067, 'P@10': 0.095, 'P@100': 0.0108, 'P@1000': 0.00113}

onnx dynamic int4/uint8 model with uint8 output (this model):

ndcg: {'NDCG@1': 0.55333, 'NDCG@3': 0.64613, 'NDCG@5': 0.67406, 'NDCG@10': 0.68834, 'NDCG@100': 0.71482, 'NDCG@1000': 0.72134}
recall: {'Recall@1': 0.52161, 'Recall@3': 0.70961, 'Recall@5': 0.77828, 'Recall@10': 0.81822, 'Recall@100': 0.94333, 'Recall@1000': 0.99333}
precision: {'P@1': 0.55333, 'P@3': 0.25889, 'P@5': 0.17533, 'P@10': 0.09333, 'P@100': 0.01073, 'P@1000': 0.00112}

Example inference/benchmark code and how to use the model with Fastembed

After installing beir-qdrant make sure to upgrade fastembed.

# pip install qdrant_client beir-qdrant
# pip install -U fastembed
from fastembed import TextEmbedding
from fastembed.common.model_description import PoolingType, ModelSource
from beir import util
from beir.datasets.data_loader import GenericDataLoader
from beir.retrieval.evaluation import EvaluateRetrieval
from qdrant_client import QdrantClient
from qdrant_client.models import Datatype
from beir_qdrant.retrieval.models.fastembed import DenseFastEmbedModelAdapter
from beir_qdrant.retrieval.search.dense import DenseQdrantSearch

TextEmbedding.add_custom_model(
    model="electroglyph/Qwen3-Embedding-0.6B-onnx-int4",
    pooling=PoolingType.DISABLED,
    normalization=False,
    sources=ModelSource(hf="electroglyph/Qwen3-Embedding-0.6B-onnx-int4"),
    dim=1024,
    model_file="dynamic_int4.onnx",
)

dataset = "scifact"
url = "https://public.ukp.informatik.tu-darmstadt.de/thakur/BEIR/datasets/{}.zip".format(dataset)
data_path = util.download_and_unzip(url, "datasets")
corpus, queries, qrels = GenericDataLoader(data_folder=data_path).load(split="test")

# IMPORTANT: USE THIS (OR A SIMILAR) QUERY FORMAT WITH THIS MODEL:
for k in queries.keys():
    queries[k] = (
        f"Instruct: Given a web search query, retrieve relevant passages that answer the query\nQuery: {queries[k]}"
    )

qdrant_client = QdrantClient("http://localhost:6333")

model = DenseQdrantSearch(
    qdrant_client,
    model=DenseFastEmbedModelAdapter(model_name="Qwen3-Embedding-0.6B-onnx-uint8"),
    collection_name="scifact-qwen3-uint8",
    initialize=True,
    datatype=Datatype.UINT8,
)

retriever = EvaluateRetrieval(model)
results = retriever.retrieve(corpus, queries)

ndcg, _map, recall, precision = retriever.evaluate(qrels, results, retriever.k_values)
print(f"ndcg: {ndcg}\nrecall: {recall}\nprecision: {precision}")