1. Introduction
Janus-Pro is a novel autoregressive framework that unifies multimodal understanding and generation.
It addresses the limitations of previous approaches by decoupling visual encoding into separate pathways, while still utilizing a single, unified transformer architecture for processing. The decoupling not only alleviates the conflict between the visual encoder’s roles in understanding and generation, but also enhances the framework’s flexibility.
Janus-Pro surpasses previous unified model and matches or exceeds the performance of task-specific models.
The simplicity, high flexibility, and effectiveness of Janus-Pro make it a strong candidate for next-generation unified multimodal models.
Github Repository
2. Model Summary
Janus-Pro is a unified understanding and generation MLLM, which decouples visual encoding for multimodal understanding and generation.
Janus-Pro is constructed based on the DeepSeek-LLM-1.5b-base/DeepSeek-LLM-7b-base.
For multimodal understanding, it uses the SigLIP-L as the vision encoder, which supports 384 x 384 image input. For image generation, Janus-Pro uses the tokenizer from here with a downsample rate of 16.
3. Usage Examples
Single Image Inference
Here is an example of visual understanding with a single image.
import torch
from PIL import Image
import requests
from transformers import JanusForConditionalGeneration, JanusProcessor
model_id = "deepseek-community/Janus-Pro-1B"
# Prepare input for generation
messages = [
{
"role": "user",
"content": [
{'type': 'image', 'url': 'http://images.cocodataset.org/val2017/000000039769.jpg'},
{'type': 'text', 'text': "What do you see in this image?"}
]
},
]
# Set generation mode to 'text' to perform text generation
processor = JanusProcessor.from_pretrained(model_id)
model = JanusForConditionalGeneration.from_pretrained(
model_id, torch_dtype=torch.bfloat16, device_map="auto"
)
inputs = processor.apply_chat_template(
messages,
add_generation_prompt=True,
generation_mode="text",
tokenize=True,
return_dict=True,
return_tensors="pt"
).to(model.device, dtype=torch.bfloat16)
output = model.generate(**inputs, max_new_tokens=40, generation_mode='text', do_sample=True)
text = processor.decode(output[0], skip_special_tokens=True)
print(text)
Text to Image generation
Janus can also generate images from prompts by simply setting the generation mode to image as shown below.
import torch
from transformers import JanusForConditionalGeneration, JanusProcessor
model_id = "deepseek-community/Janus-Pro-1B"
# Load processor and model
processor = JanusProcessor.from_pretrained(model_id)
model = JanusForConditionalGeneration.from_pretrained(
model_id, torch_dtype=torch.bfloat16, device_map="auto"
)
messages = [
{
"role": "user",
"content": [
{"type": "text", "text": "A dog running under the rain."}
]
}
]
# Apply chat template
prompt = processor.apply_chat_template(messages, add_generation_prompt=True)
inputs = processor(
text=prompt,
generation_mode="image",
return_tensors="pt"
).to(model.device, dtype=torch.bfloat16)
# Set number of images to generate
model.generation_config.num_return_sequences = 2
outputs = model.generate(
**inputs,
generation_mode="image",
do_sample=True,
use_cache=True
)
# Decode and save images
decoded_image = model.decode_image_tokens(outputs)
images = processor.postprocess(list(decoded_image.float()), return_tensors="PIL.Image.Image")
for i, image in enumerate(images["pixel_values"]):
image.save(f"image{i}.png")
4. License
This code repository is licensed under the MIT License. The use of Janus-Pro models is subject to DeepSeek Model License.
5. Citation
@article{chen2025janus,
title={Janus-Pro: Unified Multimodal Understanding and Generation with Data and Model Scaling},
author={Chen, Xiaokang and Wu, Zhiyu and Liu, Xingchao and Pan, Zizheng and Liu, Wen and Xie, Zhenda and Yu, Xingkai and Ruan, Chong},
journal={arXiv preprint arXiv:2501.17811},
year={2025}
}
6. Contact
If you have any questions, please raise an issue or contact us at [email protected].
