Csm 1b Safetensors Fp16

🚀 CSM 1B (Safetensors)

Converted from the original model to various Safetensors formats and tracks downloads.

CSM 1B (Safetensors) is converted from the original version to different Safetensors formats and also keeps track of downloads. On March 13, 2025, we released the 1B CSM variant. The code is available on GitHub: SesameAILabs/csm.

CSM (Conversational Speech Model) is a speech generation model from Sesame. It generates RVQ audio codes from text and audio inputs. The model architecture uses a Llama backbone and a smaller audio decoder that produces Mimi audio codes. A fine - tuned variant of CSM powers the interactive voice demo shown in our blog post. There is also a hosted HuggingFace space for testing audio generation.

🚀 Quick Start

📦 Installation

Set up the repository with the following steps:

python -m venv .venv
source .venv/bin/activate
curl -s -L https://raw.githubusercontent.com/SesameAILabs/csm/refs/heads/main/requirements.txt | pip install -r /dev/stdin

# You will need access to sesame/csm-1b and meta-llama/Llama-3.2-1B
huggingface-cli login

💻 Usage Examples

🔍 Basic Usage

Generate a simple sentence:

from generator import load_csm_1b
import torchaudio

generator = load_csm_1b(device="cuda")

audio = generator.generate(
    text="Hello from Sesame.",
    speaker=0,
    context=[],
    max_audio_length_ms=10_000,
)

torchaudio.save("audio.wav", audio.unsqueeze(0).cpu(), generator.sample_rate)

⚙️ Advanced Usage

CSM sounds best when provided with context. You can prompt or provide context to the model using a Segment for each speaker utterance:

speakers = [0, 1, 0, 0]
transcripts = [
    "Hey how are you doing.",
    "Pretty good, pretty good.",
    "I'm great.",
    "So happy to be speaking to you.",
]
audio_paths = [
    "utterance_0.wav",
    "utterance_1.wav",
    "utterance_2.wav",
    "utterance_3.wav",
]

def load_audio(audio_path):
    audio_tensor, sample_rate = torchaudio.load(audio_path)
    audio_tensor = torchaudio.functional.resample(
        audio_tensor.squeeze(0), orig_freq=sample_rate, new_freq=generator.sample_rate
    )
    return audio_tensor

segments = [
    Segment(text=transcript, speaker=speaker, audio=load_audio(audio_path))
    for transcript, speaker, audio_path in zip(transcripts, speakers, audio_paths)
]
audio = generator.generate(
    text="Me too, this is some cool stuff huh?",
    speaker=1,
    context=segments,
    max_audio_length_ms=10_000,
)

torchaudio.save("audio.wav", audio.unsqueeze(0).cpu(), generator.sample_rate)

📚 Documentation

❓ FAQ

• Does this model come with any voices? The model open sourced here is a base generation model. It is capable of producing a variety of voices, but it has not been fine - tuned on any specific voice.
• Can I converse with the model? CSM is trained to be an audio generation model and not a general purpose multimodal LLM. It cannot generate text. We suggest using a separate LLM for text generation.
• Does it support other languages? The model has some capacity for non - English languages due to data contamination in the training data, but it likely won't do well.

⚠️ Misuse and abuse

⚠️ Important Note

This project provides a high - quality speech generation model for research and educational purposes. While we encourage responsible and ethical use, we explicitly prohibit the following:

• Impersonation or Fraud: Do not use this model to generate speech that mimics real individuals without their explicit consent.
• Misinformation or Deception: Do not use this model to create deceptive or misleading content, such as fake news or fraudulent calls.
• Illegal or Harmful Activities: Do not use this model for any illegal, harmful, or malicious purposes.

By using this model, you agree to comply with all applicable laws and ethical guidelines. We are not responsible for any misuse, and we strongly condemn unethical applications of this technology.

👥 Authors

Johan Schalkwyk, Ankit Kumar, Dan Lyth, Sefik Emre Eskimez, Zack Hodari, Cinjon Resnick, Ramon Sanabria, Raven Jiang, and the Sesame team.

📄 License

This project is licensed under the Apache 2.0 license.