transformers/docs/source/en/model_doc/dia.md

This model was contributed to Hugging Face Transformers on 2025-06-26.

Dia

Overview

Dia is an open-source text-to-speech (TTS) model (1.6B parameters) developed by Nari Labs. It can generate highly realistic dialogue from transcript including non-verbal communications such as laughter and coughing. Furthermore, emotion and tone control is also possible via audio conditioning (voice cloning).

Model Architecture: Dia is an encoder-decoder transformer based on the original transformer architecture. However, some more modern features such as rotational positional embeddings (RoPE) are also included. For its text portion (encoder), a byte tokenizer is utilized while for the audio portion (decoder), a pretrained codec model DAC is used - DAC encodes speech into discrete codebook tokens and decodes them back into audio.

Usage Tips

Generation with Text

from transformers import AutoProcessor, DiaForConditionalGeneration


model_checkpoint = "nari-labs/Dia-1.6B-0626"

text = ["[S1] Dia is an open weights text to dialogue model."]
processor = AutoProcessor.from_pretrained(model_checkpoint)
inputs = processor(text=text, padding=True, return_tensors="pt").to(model.device)

model = DiaForConditionalGeneration.from_pretrained(model_checkpoint).to(torch_device, device_map="auto")
outputs = model.generate(**inputs, max_new_tokens=256)  # corresponds to around ~2s

# save audio to a file
outputs = processor.batch_decode(outputs)
processor.save_audio(outputs, "example.wav")

Generation with Text and Audio (Voice Cloning)

from datasets import Audio, load_dataset

from transformers import AutoProcessor, DiaForConditionalGeneration


model_checkpoint = "nari-labs/Dia-1.6B-0626"

ds = load_dataset("hf-internal-testing/dailytalk-dummy", split="train")
ds = ds.cast_column("audio", Audio(sampling_rate=44100))
audio = ds[-1]["audio"]["array"]
# text is a transcript of the audio + additional text you want as new audio
text = ["[S1] I know. It's going to save me a lot of money, I hope. [S2] I sure hope so for you."]

processor = AutoProcessor.from_pretrained(model_checkpoint)
inputs = processor(text=text, audio=audio, padding=True, return_tensors="pt").to(model.device)
prompt_len = processor.get_audio_prompt_len(inputs["decoder_attention_mask"])

model = DiaForConditionalGeneration.from_pretrained(model_checkpoint).to(torch_device, device_map="auto")
outputs = model.generate(**inputs, max_new_tokens=256)  # corresponds to around ~2s

# retrieve actually generated audio and save to a file
outputs = processor.batch_decode(outputs, audio_prompt_len=prompt_len)
processor.save_audio(outputs, "example_with_audio.wav")

Training

from datasets import Audio, load_dataset

from transformers import AutoProcessor, DiaForConditionalGeneration


model_checkpoint = "nari-labs/Dia-1.6B-0626"

ds = load_dataset("hf-internal-testing/dailytalk-dummy", split="train")
ds = ds.cast_column("audio", Audio(sampling_rate=44100))
audio = ds[-1]["audio"]["array"]
# text is a transcript of the audio
text = ["[S1] I know. It's going to save me a lot of money, I hope."]

processor = AutoProcessor.from_pretrained(model_checkpoint)
inputs = processor(
    text=text,
    audio=audio,
    generation=False,
    output_labels=True,
    padding=True,
    return_tensors="pt"
).to(model.device)

model = DiaForConditionalGeneration.from_pretrained(model_checkpoint).to(torch_device, device_map="auto")
out = model(**inputs)
out.loss.backward()

This model was contributed by Jaeyong Sung, Arthur Zucker, and Anton Vlasjuk. The original code can be found here.

DiaConfig

autodoc DiaConfig

DiaDecoderConfig

autodoc DiaDecoderConfig

DiaEncoderConfig

autodoc DiaEncoderConfig

DiaTokenizer

autodoc DiaTokenizer - call

DiaFeatureExtractor

autodoc DiaFeatureExtractor - call

DiaProcessor

autodoc DiaProcessor - call - batch_decode - decode

DiaModel

autodoc DiaModel - forward

DiaForConditionalGeneration

autodoc DiaForConditionalGeneration - forward - generate