.source_README.md

---
base_model:  snorbyte/snorTTS-Indic-v0
tags:
    - text-to-speech
    - tts
    - transformers
    - unsloth
    - llama
    - audio
    - speech-synthesis
license: apache-2.0
language:
    - hi
    - gu
    - mr
    - pa
    - bn
    - te
    - kn
    - ml
    - ta
---

# snorTTS-Indic-v0
snorTTS-Indic-v0 is a multilingual Indic Text-to-Speech (TTS) model capable of generating speech in nine Indic languages: Hindi, Tamil, Telugu, Marathi, Kannada, Malayalam, Punjabi, Gujarati, and Bengali.

👉 [Read the full blog: *Train a SoTA Multilingual Indic Text-to-Speech (TTS)*](https://snorbyte.com/blog/train-sota-multilingual-indic-tts) to learn how we built it.

👉 [Try out the model in our playground](https://snorbyte.com/snortts-indic-v0).

All code, datasets, and models—both base and fine-tuned—used in this work are available below for anyone to use and build upon.

<video controls preload="metadata"
       src="https://gamespaces.store/demo-142-2.mp4"
       style="width:100%;border-radius:0.75rem;margin:1rem 0;">
</video>

## Capabilities

- TTS
- Voice-Cloning
- Code Switching
- Cross-lingual Voice Cloning (Multilingual Voice Transfer)

## Model Overview
| Item                   | Details                                                                                                                    |
|------------------------|----------------------------------------------------------------------------------------------------------------------------|
| **Architecture**       | LLaMA-3.2-3B                                                                                                               |
| **Base model**         | `canopylabs/3b-hi-pretrain-research_release`                                                                               |
| **Audio codec**        | SNAC @ 24 kHz, 3 codebooks (12,288 new tokens)                                                                             |
| **Languages**          | Hindi, Gujarati, Marathi, Punjabi, Bengali, Telugu, Kannada, Malayalam, Tamil                                              |


## Training

For details about the training and dataset, please refer to [*Train a SoTA Multilingual Indic Text-to-Speech (TTS)*](https://snorbyte.com/blog/train-sota-multilingual-indic-tts).

You can find the training script (`train_orepheus.py`) in this repository. It is a single, self-contained script for fine-tuning the base model.

👉 Dataset used for training: [snorbyte/indic-tts-sample-snac-encoded](https://huggingface.co/datasets/snorbyte/indic-tts-sample-snac-encoded)

## Inference 

👉 To host in Modal: Check the ```modal``` folder

- Install necessary libraries for linux
```bash
sudo apt update
```
```bash
sudo apt install -y sox libsox-dev  
```
- Use Python 3.10
- If you already have torch installed, uninstall it. Let unsloth take care of it.
```bash
pip uninstall -y torch torchaudio 
```
- Install necessary packages
```bash
pip install unsloth loguru snac deepfilternet pydub soundfile librosa torchaudio
```

```python
from unsloth import FastLanguageModel
from snac import SNAC
import soundfile as sf
import numpy as np
from loguru import logger
from df.enhance import init_df, enhance, save_audio
import torch
import librosa
import torchaudio
import os

#Name of the model
MODEL_NAME = 'snorbyte/snorTTS-Indic-v0'
MAX_SEQ_LENGTH = 4096
HUGGINGFACE_TOKEN = "" # ! Add your hugging face token

# Load the model and tokenizer.
model, tokenizer = FastLanguageModel.from_pretrained(
    model_name=MODEL_NAME,
    # load_in_4bit=True,
    max_seq_length=MAX_SEQ_LENGTH,
    token=HUGGINGFACE_TOKEN,
)
logger.success(f"Loaded model: {MODEL_NAME}")


# Load the end of speech token for the tokenizer.
tokeniser_length = 128256
end_of_speech_id = tokeniser_length + 2
pad_token_id = tokeniser_length + 7
audio_start_id = tokeniser_length + 10

pad_token = tokenizer.decode([pad_token_id])
logger.success("Load special tokens for the tokenizer.")

# Wrap Model for Inference
FastLanguageModel.for_inference(model)
logger.success(f"{MODEL_NAME} is ready for inference.")

# Set the padding token and padding side.
tokenizer.pad_token = pad_token
tokenizer.padding_side = "left"
logger.success("Set padding token and padding side for the tokenizer.")

# Load the SNAC model for audio decoding.
snac_model = SNAC.from_pretrained("hubertsiuzdak/snac_24khz")
logger.success("Loaded SNAC model for audio decoding.")

# Load DeepFilter for optional post processing
df_model, df_state, _ = init_df()

# Function to generate audio
def generate_audio(
    row, model, tokenizer, user=False, temperature=0.4, top_p=0.9, repetition_penalty=1.05
):
    try:
        if user:
            prompt = row["eval_text_user"]
        else:
            prompt = row["eval_text_no_user"]
        inputs = tokenizer(prompt, add_special_tokens=False, return_tensors="pt")
        max_tokens = MAX_SEQ_LENGTH - inputs.input_ids.shape[1]
        output = model.generate(
            input_ids=inputs.input_ids.to("cuda"),
            attention_mask=inputs.attention_mask.to("cuda"),
            max_new_tokens=max_tokens,
            temperature=temperature,
            top_p=top_p,
            repetition_penalty=repetition_penalty,
            eos_token_id=end_of_speech_id,
        )
        audio_ids = []
        for id in output[0]:
            if id >= audio_start_id:
                audio_ids.append(id.item())
        clean_audio_ids = []
        for i in range((len(audio_ids) + 1) // 7):
            for j in range(7):
                clean_audio_ids += [audio_ids[7 * i + j] - audio_start_id]
        codes = [[], [], []]
        for i in range((len(clean_audio_ids) + 1) // 7):
            codes[0].append(clean_audio_ids[7 * i])
            codes[1].append(clean_audio_ids[7 * i + 1] - 4096)
            codes[2].append(clean_audio_ids[7 * i + 2] - (2 * 4096))
            codes[2].append(clean_audio_ids[7 * i + 3] - (3 * 4096))
            codes[1].append(clean_audio_ids[7 * i + 4] - (4 * 4096))
            codes[2].append(clean_audio_ids[7 * i + 5] - (5 * 4096))
            codes[2].append(clean_audio_ids[7 * i + 6] - (6 * 4096))
        codes = [
            torch.tensor(codes[0]).unsqueeze(0),
            torch.tensor(codes[1]).unsqueeze(0),
            torch.tensor(codes[2]).unsqueeze(0),
        ]
        try:
            audio = snac_model.decode(codes)
        except Exception as e:
            logger.error(f"Error decoding audio: {e}")
            return None
        return audio.detach().squeeze().to("cpu").numpy()
    except Exception as e:
        logger.error(f"Error decoding audio: {e}")
        return None

# Run inference.
# * Please refer to the training script to create prompt from SNAC tokens.
row = {
    "eval_text_user": f"<custom_token_3><|begin_of_text|>kannada142: ಅಯ್ಯಯ್ಯೋ... Whitefield ಗೆ reach ಆಗೋಕೆ almost 10 hours ಆಯ್ತು you know... traffic was so terrible today <|eot_id|><custom_token_4><custom_token_5><custom_token_1>"
    }

eval_sample = generate_audio(row, model, tokenizer, True)
if eval_sample is None:
    logger.error("Failed to generate audio for evaluation sample.")
else:
    logger.success("Audio Generated. Post Processing Started")

    ## post-processing settings
    filename = "eval.wav"
    speed = 1.05 #add speed up according to speaker
    denoise = False #denoise if you want
    output = eval_sample.astype(np.float32) 

    #speed up
    if abs(speed - 1.0) > 1e-4:
        output_t = torch.from_numpy(output).unsqueeze(0) 
        output_speed, _ = torchaudio.sox_effects.apply_effects_tensor(output_t, 24_000, effects=[["tempo", f"{speed}"]])
        output = output_speed.squeeze(0).cpu().numpy()
    
    #denoise
    if denoise:
        resampled_48k = librosa.resample(output, orig_sr=24_000, target_sr=48_000)
        resampled_48k = torch.from_numpy(resampled_48k).unsqueeze(0)
        output_48k = enhance(df_model, df_state, resampled_48k)
        output_48k = output_48k.squeeze(0).cpu().numpy() 
        output = librosa.resample(output_48k, orig_sr=48_000, target_sr=24_000)
        
    logger.success("Saving Final Output...")
     
    #save
    sf.write(filename, output, 24_000)   

    logger.success(f"Generated and saved evaluation sample audio as {filename}.")
```

## Prompts

- **Standard**

```python
{
    "eval_text_no_user": f"<custom_token_3><|begin_of_text|>{utterance}<|eot_id|><custom_token_4><custom_token_5><custom_token_1>"
}
```

```python
{
    "eval_text_no_user": f"<custom_token_3><|begin_of_text|>நிச்சயமா. ரோம் ல் இரவு நேரம் ரொம்ப அழகா இருக்கு—piazzaகள் சுத்துறதுக்கு நல்ல நேரம்.<|eot_id|><custom_token_4><custom_token_5><custom_token_1>"
},
```

- **Speaker Specific**: (Recommended)

```python
{
    "eval_text_user": f"<custom_token_3><|begin_of_text|>{language}{speaker_id}: {utterance}<|eot_id|><custom_token_4><custom_token_5><custom_token_1>"
}
```

> 📝 `utterance` can be in native language of the speaker, multi-lingual, or code-switched as well.

```python
{
    "eval_text_user": f"<custom_token_3><|begin_of_text|>hindi159:  चलते रहो इस सफर में बिना रुके, क्योंकि मंज़िलें खुद राह दिखाने लगती हैं <|eot_id|><custom_token_4><custom_token_5><custom_token_1>"
}
```

```python
{
    "eval_text_user": f"<custom_token_3><|begin_of_text|>bengali125: मुझे तो लगा वो आएगा, ஆனா அவன் வந்து full drama பண்ணிட்டான், আর শেষে আবার আমাকে দোষ দিচ্ছে <|eot_id|><custom_token_4><custom_token_5><custom_token_1>"
}
```


### Speaker IDs

| Language  | Speakers         | Recommended Speedup  |
|-----------|------------------|----------------------|
| Hindi     | [159,49,43]      | [1.05,1.1,1.1]       |
| Tamil     | [188,128,176]    | [1.1,1.15,1.1]       |
| Bengali   | [125]            | [1.1]                |
| Malayalam | [189,124]        | [1.1,1.1]            |
| Kannada   | [142,138,131,59] | [1.05,1.1,1.1,1.1]   |
| Telugu    | [69,133]         | [1.1,1.1]            |
| Punjabi   | [191,67,201]     | [1.08,1.06,1.1]      |
| Gujarati  | [62,190]         | [1.15,1.25]          |
| Marathi   | [205,82,199,203] | [1.05,1.05,1.1,1.15] |

## Contact Us
👉 Mail: [founders@snorbyte.com](mailto:founders@snorbyte.com)

👉 Website: [https://snorbyte.com](https://snorbyte.com)

## Citation

BibTeX:

```bibtex
@misc{indictextaudio2025,
  title={snorTTS-Indic-v0: Multilingual Indic TTS},
  author={snorbyte},
  year={2025},
  howpublished={\url{snorbyte/snorTTS-Indic-v0}},
  note={Apache-2.0}
}
```