Qwen3-Embedding

Qwen3-Embedding#

Introduction#

The Qwen3 Embedding model series is the latest proprietary model of the Qwen family, specifically designed for text embedding and ranking tasks. Building upon the dense foundational models of the Qwen3 series, it provides a comprehensive range of text embeddings and reranking models in various sizes (0.6B, 4B, and 8B). This guide describes how to run the model with vLLM Ascend. Note that only 0.9.2rc1 and higher versions of vLLM Ascend support the model.

Supported Features#

Refer to supported features to get the model’s supported feature matrix.

Environment Preparation#

Model Weight#

It is recommended to download the model weight to the shared directory of multiple nodes, such as /root/.cache/

Installation#

You can use our official docker image to run Qwen3-Embedding series models.

  • Start the docker image on your node, refer to using docker.

if you don’t want to use the docker image as above, you can also build all from source:

Deployment#

Using the Qwen3-Embedding-8B model as an example, first run the docker container with the following command:

Online Inference#

vllm serve Qwen/Qwen3-Embedding-8B --runner pooling --host 127.0.0.1 --port 8888

Once your server is started, you can query the model with input prompts.

curl http://127.0.0.1:8888/v1/embeddings -H "Content-Type: application/json" -d '{
  "input": [
        "The capital of China is Beijing.",
        "Gravity is a force that attracts two bodies towards each other. It gives weight to physical objects and is responsible for the movement of planets around the sun."
    ]
}'

Offline Inference#

import torch
import vllm
from vllm import LLM

def get_detailed_instruct(task_description: str, query: str) -> str:
    return f'Instruct: {task_description}\nQuery:{query}'


if __name__=="__main__":
    # Each query must come with a one-sentence instruction that describes the task
    task = 'Given a web search query, retrieve relevant passages that answer the query'

    queries = [
        get_detailed_instruct(task, 'What is the capital of China?'),
        get_detailed_instruct(task, 'Explain gravity')
    ]
    # No need to add instruction for retrieval documents
    documents = [
        "The capital of China is Beijing.",
        "Gravity is a force that attracts two bodies towards each other. It gives weight to physical objects and is responsible for the movement of planets around the sun."
    ]
    input_texts = queries + documents

    model = LLM(model="Qwen/Qwen3-Embedding-8B",
                distributed_executor_backend="mp")

    outputs = model.embed(input_texts)
    embeddings = torch.tensor([o.outputs.embedding for o in outputs])
    scores = (embeddings[:2] @ embeddings[2:].T)
    print(scores.tolist())

If you run this script successfully, you can see the info shown below:

Adding requests: 100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 4/4 [00:00<00:00, 282.22it/s]
Processed prompts:   0%|                                                                                                                                    | 0/4 [00:00<?, ?it/s, est. speed input: 0.00 toks/s, output: 0.00 toks/s](VllmWorker rank=0 pid=4074750) ('Warning: torch.save with "_use_new_zipfile_serialization = False" is not recommended for npu tensor, which may bring unexpected errors and hopefully set "_use_new_zipfile_serialization = True"', 'if it is necessary to use this, please convert the npu tensor to cpu tensor for saving')
Processed prompts: 100%|████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 4/4 [00:00<00:00, 31.95it/s, est. speed input: 0.00 toks/s, output: 0.00 toks/s]
[[0.7477798461914062, 0.07548339664936066], [0.0886271521449089, 0.6311039924621582]]

Performance#

Run performance of Qwen3-Reranker-8B as an example. Refer to vllm benchmark for more details.

Take the serve as an example. Run the code as follows.

vllm bench serve --model Qwen3-Embedding-8B --backend openai-embeddings --dataset-name random --host 127.0.0.1 --port 8888 --endpoint /v1/embeddings --tokenizer /root/.cache/Qwen3-Embedding-8B --random-input 200 --save-result --result-dir ./

After about several minutes, you can get the performance evaluation result. With this tutorial, the performance result is:

============ Serving Benchmark Result ============
Successful requests:                     1000
Failed requests:                         0
Benchmark duration (s):                  6.78
Total input tokens:                      108032
Request throughput (req/s):              31.11
Total Token throughput (tok/s):          15929.35
----------------End-to-end Latency----------------
Mean E2EL (ms):                          4422.79
Median E2EL (ms):                        4412.58
P99 E2EL (ms):                           6294.52
==================================================
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