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*This model was published in HF papers on 2025-03-26 and contributed to Hugging Face Transformers on 2025-04-14.*

# Qwen2.5-Omni

<div class="flex flex-wrap space-x-1">
<img alt="FlashAttention" src="https://img.shields.io/badge/%E2%9A%A1%EF%B8%8E%20FlashAttention-eae0c8?style=flat">
<img alt="SDPA" src="https://img.shields.io/badge/SDPA-DE3412?style=flat&logo=pytorch&logoColor=white">
</div>

## Overview

The [Qwen2.5-Omni](https://qwenlm.github.io/blog/qwen2.5-omni/) model is a unified multiple modalities model proposed in [Qwen2.5-Omni Technical Report](https://huggingface.co/papers/2503.20215) from Qwen team, Alibaba Group.

The abstract from the technical report is the following:

*We present Qwen2.5-Omni, an end-to-end multimodal model designed to perceive diverse modalities, including text, images, audio, and video, while simultaneously generating text and natural speech responses in a streaming manner. To enable the streaming of multimodal information inputs, both audio and visual encoders utilize a block-wise processing approach. This strategy effectively decouples the handling of long sequences of multimodal data, assigning the perceptual responsibilities to the multimodal encoder and entrusting the modeling of extended sequences to a large language model. Such a division of labor enhances the fusion of different modalities via the shared attention mechanism. To synchronize the timestamps of video inputs with audio, we organized the audio and video sequentially in an interleaved manner and propose a novel position embedding approach, named TMRoPE (Time-aligned Multimodal RoPE). To concurrently generate text and speech while avoiding interference between the two modalities, we propose Thinker-Talker architecture. In this framework, Thinker functions as a large language model tasked with text generation, while Talker is a dual-track autoregressive model that directly utilizes the hidden representations from the Thinker to produce audio tokens as output. Both the Thinker and Talker models are designed to be trained and inferred in an end-to-end manner. For decoding audio tokens in a streaming manner, we introduce a sliding-window DiT that restricts the receptive field, aiming to reduce the initial package delay. Qwen2.5-Omni outperforms the similarly sized Qwen2-VL and Qwen2-Audio in both image and audio capabilities. Furthermore, Qwen2.5-Omni achieves state-of-the-art performance on multimodal benchmarks like Omni-Bench. Notably, Qwen2.5-Omni is the first open-source model to achieve a level of performance in end-to-end speech instruction following that is comparable to its capabilities with text inputs, as evidenced by benchmarks such as MMLU and GSM8K. As for speech generation, Qwen2.5-Omni's streaming Talker outperform most existing streaming and non-streaming alternatives in robustness and naturalness.*

## Notes

- Use [`Qwen2_5OmniForConditionalGeneration`] to generate audio and text output. To generate only one output type, use [`Qwen2_5OmniThinkerForConditionalGeneration`] for text-only and [`Qwen2_5OmniTalkersForConditionalGeneration`] for audio-only outputs.
- In case out-of-memory errors when working with video input, decrease `processor.max_pixels`. By default the maximum is set to a very large value and high resolution visuals will not be resized, unless resolution exceeds `processor.max_pixels`.
- The processor has its own [`~ProcessorMixin.apply_chat_template`] method to convert chat messages to model inputs.

## Usage example

`Qwen2.5-Omni` can be found on the [Huggingface Hub](https://huggingface.co/Qwen).

### Single Media inference

The model can accept text, images, audio and videos as input. Here's an example code for inference.

```python
import soundfile as sf

from transformers import Qwen2_5OmniForConditionalGeneration, Qwen2_5OmniProcessor


model = Qwen2_5OmniForConditionalGeneration.from_pretrained(
    "Qwen/Qwen2.5-Omni-7B",
    device_map="auto",
)
processor = Qwen2_5OmniProcessor.from_pretrained("Qwen/Qwen2.5-Omni-7B")

conversations = [
    {
        "role": "system",
        "content": [
            {"type": "text", "text": "You are Qwen, a virtual human developed by the Qwen Team, Alibaba Group, capable of perceiving auditory and visual inputs, as well as generating text and speech."}
        ],
    },
    {
        "role": "user",
        "content": [
            {"type": "video", "video": "/path/to/video.mp4"},
            {"type": "text", "text": "What can't you hear and see in this video?"},
        ],
    },
]

inputs = processor.apply_chat_template(
    conversations,
    load_audio_from_video=True,
    add_generation_prompt=True,
    tokenize=True,
    return_dict=True,
    return_tensors="pt",
    fps=1,

    # kwargs to be passed to `Qwen2-5-OmniProcessor`
    padding=True,
    use_audio_in_video=True,
).to(model.device)

# Generation params for audio or text can be different and have to be prefixed with `thinker_` or `talker_`
text_ids, audio = model.generate(**inputs, use_audio_in_video=True, thinker_do_sample=False, talker_do_sample=True)
text = processor.batch_decode(text_ids, skip_special_tokens=True, clean_up_tokenization_spaces=False)

sf.write(
    "output.wav",
    audio.reshape(-1).detach().cpu().numpy(),
    samplerate=24000,
)
print(text)
```

### Text-only generation

To generate only text output and save compute by not loading the audio generation model, we can use `Qwen2_5OmniThinkerForConditionalGeneration` model.  

```python
from transformers import Qwen2_5OmniProcessor, Qwen2_5OmniThinkerForConditionalGeneration


model = Qwen2_5OmniThinkerForConditionalGeneration.from_pretrained(
    "Qwen/Qwen2.5-Omni-7B",
    device_map="auto",
)
processor = Qwen2_5OmniProcessor.from_pretrained("Qwen/Qwen2.5-Omni-7B")

conversations = [
    {
        "role": "system",
        "content": [
            {"type": "text", "text": "You are Qwen, a virtual human developed by the Qwen Team, Alibaba Group, capable of perceiving auditory and visual inputs, as well as generating text and speech."}
        ],
    },
    {
        "role": "user",
        "content": [
            {"type": "video", "video": "/path/to/video.mp4"},
            {"type": "text", "text": "What can't you hear and see in this video?"},
        ],
    },
]

inputs = processor.apply_chat_template(
    conversations,
    load_audio_from_video=True,
    add_generation_prompt=True,
    tokenize=True,
    return_dict=True,
    return_tensors="pt",
    fps=1,

    # kwargs to be passed to `Qwen2-5-OmniProcessor`
    padding=True,
    use_audio_in_video=True,
).to(model.device)


text_ids = model.generate(**inputs, use_audio_in_video=True)
text = processor.batch_decode(text_ids, skip_special_tokens=True, clean_up_tokenization_spaces=False)

print(text)
```

### Batch Mixed Media Inference

The model can batch inputs composed of mixed samples of various types such as text, images, audio and videos as input when using `Qwen2_5OmniThinkerForConditionalGeneration` model. Here is an example.

```python
from transformers import Qwen2_5OmniForConditionalGeneration, Qwen2_5OmniProcessor


model = Qwen2_5OmniForConditionalGeneration.from_pretrained(
    "Qwen/Qwen2.5-Omni-7B",
    device_map="auto"
)
processor = Qwen2_5OmniProcessor.from_pretrained("Qwen/Qwen2.5-Omni-7B")

# Conversation with video only
conversation1 = [
    {
        "role": "system",
        "content": [
            {"type": "text", "text": "You are Qwen, a virtual human developed by the Qwen Team, Alibaba Group, capable of perceiving auditory and visual inputs, as well as generating text and speech."}
        ],
    },
    {
        "role": "user",
        "content": [
            {"type": "video", "path": "/path/to/video.mp4"},
        ]
    }
]

# Conversation with audio only
conversation2 = [
    {
        "role": "system",
        "content": [
            {"type": "text", "text": "You are Qwen, a virtual human developed by the Qwen Team, Alibaba Group, capable of perceiving auditory and visual inputs, as well as generating text and speech."}
        ],
    },
    {
        "role": "user",
        "content": [
            {"type": "audio", "path": "/path/to/audio.wav"},
        ]
    }
]

# Conversation with pure text
conversation3 = [
    {
        "role": "system",
        "content": [
            {"type": "text", "text": "You are Qwen, a virtual human developed by the Qwen Team, Alibaba Group, capable of perceiving auditory and visual inputs, as well as generating text and speech."}
        ],
    },
    {
        "role": "user",
        "content": [{"type": "text", "text": "who are you?"}],
    }
]


# Conversation with mixed media
conversation4 = [
    {
        "role": "system",
        "content": [
            {"type": "text", "text": "You are Qwen, a virtual human developed by the Qwen Team, Alibaba Group, capable of perceiving auditory and visual inputs, as well as generating text and speech."}
        ],
    },
    {
        "role": "user",
        "content": [
            {"type": "image", "path": "/path/to/image.jpg"},
            {"type": "video", "path": "/path/to/video.mp4"},
            {"type": "audio", "path": "/path/to/audio.wav"},
            {"type": "text", "text": "What are the elements can you see and hear in these media?"},
        ],
    }
]

conversations = [conversation1, conversation2, conversation3, conversation4]

inputs = processor.apply_chat_template(
    conversations,
    load_audio_from_video=True,
    add_generation_prompt=True,
    tokenize=True,
    return_dict=True,
    return_tensors="pt",
    fps=1,

    # kwargs to be passed to `Qwen2-5-OmniProcessor`
    padding=True,
    use_audio_in_video=True,
).to(model.thinker.device)

text_ids = model.generate(**inputs, use_audio_in_video=True)
text = processor.batch_decode(text_ids, skip_special_tokens=True, clean_up_tokenization_spaces=False)

print(text)
```

### Batch audio generation

[`Qwen2_5OmniForConditionalGeneration`] supports batched audio output generation. For example, below for text-to-speech batch generation. With a batch of more than one sample, the generated audio is returned as a list with one waveform per sample, each already trimmed to its own length, so shorter samples are not padded with spurious audio. A single-sample call still returns one tensor.

```python
import soundfile as sf
from transformers import AutoModelForTextToWaveform, AutoProcessor
import torch

model_id = "Qwen/Qwen2.5-Omni-7B"
model = AutoModelForTextToWaveform.from_pretrained(model_id, device_map="auto")
processor = AutoProcessor.from_pretrained(model_id)
sampling_rate = 24000  # output sampling rate
max_new_tokens = 200  # maximum number of tokens to generate

system_text = (
    "You are Qwen, a virtual human developed by the Qwen Team, Alibaba Group, capable of "
    "perceiving auditory and visual inputs, as well as generating text and speech."
)
texts = [
    "Hello, I'm Qwen. How can I help you today?",
    "The weather is nice today. Let's go for a walk.",
]
inputs = processor.apply_chat_template(
    [
        [
            {"role": "system", "content": [{"type": "text", "text": system_text}]},
            {
                "role": "user",
                "content": [
                    {
                        "type": "text",
                        "text": (
                            "Please read the following text aloud exactly as written, with no "
                            f"additional commentary:\n\n{text}"
                        ),
                    }
                ],
            },
        ]
        for text in texts
    ],
    tokenize=True,
    add_generation_prompt=True,
    return_dict=True,
    return_tensors="pt",
    processor_kwargs={"padding": True},
).to(model.device, dtype=model.dtype)

gen_kwargs = {
    "talker_do_sample": True,
    "speaker": "Ethan",  # Ethan, Chelsie
    "talker_max_new_tokens": max_new_tokens,
}
_, pred_waveform = model.generate(**inputs, **gen_kwargs)

for sample_id, audio in enumerate(pred_waveform):
    sf.write(
        f"qwen2_5_omni_output_{sample_id}.wav",
        audio.detach().to(torch.float32).cpu().numpy(),
        sampling_rate,
    )
    print(f"Saved audio to qwen2_5_omni_output_{sample_id}.wav")
```

### Usage Tips

#### Image Resolution trade-off

The model supports a wide range of resolution inputs. By default, it uses the native resolution for input, but higher resolutions can enhance performance at the cost of more computation. Users can set the minimum and maximum number of pixels to achieve an optimal configuration for their needs.

```python
min_pixels = 128*28*28
max_pixels = 768*28*28
processor = AutoProcessor.from_pretrained("Qwen/Qwen2.5-Omni-7B", min_pixels=min_pixels, max_pixels=max_pixels)
```

#### Prompt for audio output

If users need audio output, the system prompt must be set as "You are Qwen, a virtual human developed by the Qwen Team, Alibaba Group, capable of perceiving auditory and visual inputs, as well as generating text and speech.", otherwise the audio output may not work as expected.

```python
{
    "role": "system",
    "content": "You are Qwen, a virtual human developed by the Qwen Team, Alibaba Group, capable of perceiving auditory and visual inputs, as well as generating text and speech.",
}
```

#### Use audio output or not

The model supports both text and audio outputs, if users do not need audio outputs, they can set `enable_audio_output` in the `from_pretrained` function. This option will save about `~2GB` of GPU memory but the `return_audio` option for `generate` function will only allow to be set at `False`.

```python
model = Qwen2_5OmniForConditionalGeneration.from_pretrained(
    "Qwen/Qwen2.5-Omni-7B",
    device_map="auto",
    enable_audio_output=False,
)
```

In order to obtain a flexible experience, we recommend that users set `enable_audio_output` at `True` when initializing the model through `from_pretrained` function, and then decide whether to return audio when `generate` function is called. When `return_audio` is set to `False`, the model will only return text outputs to get text responses faster.

```python
model = Qwen2_5OmniForConditionalGeneration.from_pretrained(
    "Qwen/Qwen2.5-Omni-7B",
    device_map="auto",
    enable_audio_output=True,
)
...
text_ids = model.generate(**inputs, return_audio=False)
```

#### Change voice type of output audio

Qwen2.5-Omni supports the ability to change the voice of the output audio. Users can use the `speaker` parameter of `generate` function to specify the voice type. The `"Qwen/Qwen2.5-Omni-7B"` checkpoint support two voice types: `Chelsie` and `Ethan`, while `Chelsie` is a female voice and `Ethan` is a male voice. By default, if `speaker` is not specified, the default voice type is `Chelsie`.

```python
text_ids, audio = model.generate(**inputs, speaker="Chelsie")
```

```python
text_ids, audio = model.generate(**inputs, speaker="Ethan")
```

#### Flash-Attention 2 to speed up generation

First, make sure to install the latest version of Flash Attention 2:

```bash
pip install -U flash-attn --no-build-isolation
```

Also, you should have hardware that is compatible with FlashAttention 2. Read more about it in the official documentation of the [flash attention repository](https://github.com/Dao-AILab/flash-attention). FlashAttention-2 can only be used when a model is loaded in `torch.float16` or `torch.bfloat16`.

To load and run a model using FlashAttention-2, add `attn_implementation="flash_attention_2"` when loading the model:

```python
from transformers import Qwen2_5OmniForConditionalGeneration


model = Qwen2_5OmniForConditionalGeneration.from_pretrained(
    "Qwen/Qwen2.5-Omni-7B",
    device_map="auto",
    attn_implementation="flash_attention_2",
)
```

## Qwen2_5OmniConfig

[[autodoc]] Qwen2_5OmniConfig

## Qwen2_5OmniVisionEncoderConfig

[[autodoc]] Qwen2_5OmniVisionEncoderConfig

## Qwen2_5OmniTextConfig

[[autodoc]] Qwen2_5OmniTextConfig

## Qwen2_5OmniDiTConfig

[[autodoc]] Qwen2_5OmniDiTConfig

## Qwen2_5OmniBigVGANConfig

[[autodoc]] Qwen2_5OmniBigVGANConfig

## Qwen2_5OmniAudioEncoderConfig

[[autodoc]] Qwen2_5OmniAudioEncoderConfig

## Qwen2_5OmniProcessor

[[autodoc]] Qwen2_5OmniProcessor
    - __call__

## Qwen2_5OmniForConditionalGeneration

[[autodoc]] Qwen2_5OmniForConditionalGeneration
    - forward

## Qwen2_5OmniPreTrainedModelForConditionalGeneration

[[autodoc]] Qwen2_5OmniPreTrainedModelForConditionalGeneration

## Qwen2_5OmniThinkerConfig

[[autodoc]] Qwen2_5OmniThinkerConfig

## Qwen2_5OmniThinkerForConditionalGeneration

[[autodoc]] Qwen2_5OmniThinkerForConditionalGeneration

## Qwen2_5OmniThinkerTextModel

[[autodoc]] Qwen2_5OmniThinkerTextModel

## Qwen2_5OmniTalkerConfig

[[autodoc]] Qwen2_5OmniTalkerConfig

## Qwen2_5OmniTalkerForConditionalGeneration

[[autodoc]] Qwen2_5OmniTalkerForConditionalGeneration

## Qwen2_5OmniTalkerModel

[[autodoc]] Qwen2_5OmniTalkerModel

## Qwen2_5OmniToken2WavConfig

[[autodoc]] Qwen2_5OmniToken2WavConfig

## Qwen2_5OmniToken2WavModel

[[autodoc]] Qwen2_5OmniToken2WavModel

## Qwen2_5OmniToken2WavDiTModel

[[autodoc]] Qwen2_5OmniToken2WavDiTModel

## Qwen2_5OmniToken2WavBigVGANModel

[[autodoc]] Qwen2_5OmniToken2WavBigVGANModel
