Instructions to use tencent/Hunyuan-4B-Pretrain with libraries, inference providers, notebooks, and local apps. Follow these links to get started.

Libraries

How to use tencent/Hunyuan-4B-Pretrain with Transformers:

# Use a pipeline as a high-level helper
from transformers import pipeline

pipe = pipeline("text-generation", model="tencent/Hunyuan-4B-Pretrain")
messages = [
    {"role": "user", "content": "Who are you?"},
]
pipe(messages)

# Load model directly
from transformers import AutoTokenizer, AutoModelForCausalLM

tokenizer = AutoTokenizer.from_pretrained("tencent/Hunyuan-4B-Pretrain")
model = AutoModelForCausalLM.from_pretrained("tencent/Hunyuan-4B-Pretrain")
messages = [
    {"role": "user", "content": "Who are you?"},
]
inputs = tokenizer.apply_chat_template(
	messages,
	add_generation_prompt=True,
	tokenize=True,
	return_dict=True,
	return_tensors="pt",
).to(model.device)

outputs = model.generate(**inputs, max_new_tokens=40)
print(tokenizer.decode(outputs[0][inputs["input_ids"].shape[-1]:]))

Notebooks
Google Colab
Kaggle
Local Apps Settings

vLLM

How to use tencent/Hunyuan-4B-Pretrain with vLLM:

Install from pip and serve model

# Install vLLM from pip:
pip install vllm
# Start the vLLM server:
vllm serve "tencent/Hunyuan-4B-Pretrain"
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:8000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "tencent/Hunyuan-4B-Pretrain",
		"messages": [
			{
				"role": "user",
				"content": "What is the capital of France?"
			}
		]
	}'

Use Docker

docker model run hf.co/tencent/Hunyuan-4B-Pretrain

SGLang

How to use tencent/Hunyuan-4B-Pretrain with SGLang:

Install from pip and serve model

# Install SGLang from pip:
pip install sglang
# Start the SGLang server:
python3 -m sglang.launch_server \
    --model-path "tencent/Hunyuan-4B-Pretrain" \
    --host 0.0.0.0 \
    --port 30000
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:30000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "tencent/Hunyuan-4B-Pretrain",
		"messages": [
			{
				"role": "user",
				"content": "What is the capital of France?"
			}
		]
	}'

Use Docker images

docker run --gpus all \
    --shm-size 32g \
    -p 30000:30000 \
    -v ~/.cache/huggingface:/root/.cache/huggingface \
    --env "HF_TOKEN=<secret>" \
    --ipc=host \
    lmsysorg/sglang:latest \
    python3 -m sglang.launch_server \
        --model-path "tencent/Hunyuan-4B-Pretrain" \
        --host 0.0.0.0 \
        --port 30000
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:30000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "tencent/Hunyuan-4B-Pretrain",
		"messages": [
			{
				"role": "user",
				"content": "What is the capital of France?"
			}
		]
	}'

Docker Model Runner
How to use tencent/Hunyuan-4B-Pretrain with Docker Model Runner:
```
docker model run hf.co/tencent/Hunyuan-4B-Pretrain
```

KeyError: 'hunyuan_v1_dense'

by hhy150 - opened Nov 6, 2025

Discussion

hhy150

Nov 6, 2025

[rank4]: Traceback (most recent call last):
[rank4]: File "/usr/local/lib/python3.10/site-packages/transformers/models/auto/configuration_auto.py", line 951, in from_pretrained
[rank4]: config_class = CONFIG_MAPPING[config_dict["model_type"]]
[rank4]: File "/usr/local/lib/python3.10/site-packages/transformers/models/auto/configuration_auto.py", line 653, in getitem
[rank4]: raise KeyError(key)
[rank4]: KeyError: 'hunyuan_v1_dense'

[rank4]: During handling of the above exception, another exception occurred:

[rank4]: model = AutoModelForCausalLM.from_pretrained(
[rank4]: File "/usr/local/lib/python3.10/site-packages/transformers/models/auto/auto_factory.py", line 523, in from_pretrained
[rank4]: config, kwargs = AutoConfig.from_pretrained(
[rank4]: File "/usr/local/lib/python3.10/site-packages/transformers/models/auto/configuration_auto.py", line 953, in from_pretrained
[rank4]: raise ValueError(
[rank4]: ValueError: The checkpoint you are trying to load has model type hunyuan_v1_dense but Transformers does not recognize this architecture. This could be because of an issue with the checkpoint, or because your version of Transformers is out of date.

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