app.py

import os
import torch
import gradio as gr
from transformers import AutoModelForCausalLM, AutoTokenizer
from huggingface_hub import snapshot_download
from dotenv import load_dotenv

# Load environment variables
load_dotenv()

# Device and torch dtype selection
device = "cuda" if torch.cuda.is_available() else "cpu"
torch_dtype = torch.bfloat16 if device == "cuda" else torch.float32

# Define a no-op decorator for CPU if needed
def gpu_decorator(func):
    return func

# If you are on GPU and have the spaces module, you could replace gpu_decorator with spaces.GPU
# For CPU usage we simply use a no-op
# Example: from snac import spaces; gpu_decorator = spaces.GPU()

# Import SNAC after setting device
from snac import SNAC

print("Loading SNAC model...")
snac_model = SNAC.from_pretrained("hubertsiuzdak/snac_24khz")
snac_model = snac_model.to(device)
snac_model.eval()  # set SNAC to eval mode

model_name = "canopylabs/orpheus-3b-0.1-ft"

# Download only model config and safetensors files
snapshot_download(
    repo_id=model_name,
    allow_patterns=[
        "config.json",
        "*.safetensors",
        "model.safetensors.index.json",
    ],
    ignore_patterns=[
        "optimizer.pt",
        "pytorch_model.bin",
        "training_args.bin",
        "scheduler.pt",
        "tokenizer.json",
        "tokenizer_config.json",
        "special_tokens_map.json",
        "vocab.json",
        "merges.txt",
        "tokenizer.*"
    ]
)

print("Loading Orpheus model...")
model = AutoModelForCausalLM.from_pretrained(model_name, torch_dtype=torch_dtype)
model.to(device)
model.eval()  # set Orpheus to eval mode
tokenizer = AutoTokenizer.from_pretrained(model_name)
print(f"Orpheus model loaded to {device}")

# Process text prompt into tokens with start/end markers
def process_prompt(prompt, voice, tokenizer, device):
    prompt = f"{voice}: {prompt}"
    input_ids = tokenizer(prompt, return_tensors="pt").input_ids

    start_token = torch.tensor([[128259]], dtype=torch.int64)  # Start token
    end_tokens = torch.tensor([[128009, 128260]], dtype=torch.int64)  # End tokens

    modified_input_ids = torch.cat([start_token, input_ids, end_tokens], dim=1)
    attention_mask = torch.ones_like(modified_input_ids)
    return modified_input_ids.to(device), attention_mask.to(device)

# Parse output tokens to extract audio codes
def parse_output(generated_ids):
    token_to_find = 128257
    token_to_remove = 128258

    token_indices = (generated_ids == token_to_find).nonzero(as_tuple=True)
    if len(token_indices[1]) > 0:
        last_occurrence_idx = token_indices[1][-1].item()
        cropped_tensor = generated_ids[:, last_occurrence_idx + 1:]
    else:
        cropped_tensor = generated_ids

    processed_rows = []
    for row in cropped_tensor:
        masked_row = row[row != token_to_remove]
        processed_rows.append(masked_row)

    code_lists = []
    for row in processed_rows:
        row_length = row.size(0)
        new_length = (row_length // 7) * 7
        trimmed_row = row[:new_length]
        trimmed_row = [t - 128266 for t in trimmed_row]
        code_lists.append(trimmed_row)

    return code_lists[0]  # Return first sample

# Redistribute codes for audio generation using SNAC
def redistribute_codes(code_list, snac_model):
    snac_device = next(snac_model.parameters()).device
    layer_1, layer_2, layer_3 = [], [], []
    for i in range((len(code_list) + 1) // 7):
        layer_1.append(code_list[7 * i])
        layer_2.append(code_list[7 * i + 1] - 4096)
        layer_3.append(code_list[7 * i + 2] - (2 * 4096))
        layer_3.append(code_list[7 * i + 3] - (3 * 4096))
        layer_2.append(code_list[7 * i + 4] - (4 * 4096))
        layer_3.append(code_list[7 * i + 5] - (5 * 4096))
        layer_3.append(code_list[7 * i + 6] - (6 * 4096))

    codes = [
        torch.tensor(layer_1, device=snac_device).unsqueeze(0),
        torch.tensor(layer_2, device=snac_device).unsqueeze(0),
        torch.tensor(layer_3, device=snac_device).unsqueeze(0)
    ]

    audio_hat = snac_model.decode(codes)
    return audio_hat.detach().squeeze().cpu().numpy()

# Main generation function with CPU optimizations
@gpu_decorator
def generate_speech(text, voice, temperature, top_p, repetition_penalty, max_new_tokens, progress=gr.Progress()):
    if not text.strip():
        return None

    try:
        progress(0.1, "Processing text...")
        input_ids, attention_mask = process_prompt(text, voice, tokenizer, device)

        progress(0.3, "Generating speech tokens...")
        with torch.inference_mode():
            generated_ids = model.generate(
                input_ids=input_ids,
                attention_mask=attention_mask,
                max_new_tokens=max_new_tokens,
                do_sample=True,
                temperature=temperature,
                top_p=top_p,
                repetition_penalty=repetition_penalty,
                num_return_sequences=1,
                eos_token_id=128258,
            )

        progress(0.6, "Processing speech tokens...")
        code_list = parse_output(generated_ids)

        progress(0.8, "Converting tokens to audio...")
        audio_samples = redistribute_codes(code_list, snac_model)

        return (24000, audio_samples)  # Return sample rate and numpy array audio
    except Exception as e:
        print(f"Error generating speech: {e}")
        return None

# Example inputs for the Gradio UI
examples = [
    ["Hey there my name is Tara, <chuckle> and I'm a speech generation model that can sound like a person.", "tara", 0.6, 0.95, 1.1, 1200],
    ["I've also been taught to understand and produce paralinguistic things like sighing, or chuckling, or yawning!", "dan", 0.7, 0.95, 1.1, 1200],
    ["I live in San Francisco, and have, uhm let's see, 3 billion 7 hundred ... well, let's just say a lot of parameters.", "emma", 0.6, 0.9, 1.2, 1200]
]

VOICES = ["tara", "dan", "josh", "emma"]

# Create Gradio interface
with gr.Blocks(title="Orpheus Text-to-Speech") as demo:
    gr.Markdown("""
    # 🎵 Orpheus Text-to-Speech
    Enter your text below and hear it converted to natural-sounding speech.
    
    **Tips for better prompts:**
    - Include paralinguistic elements like `<chuckle>`, `<sigh>`, or `uhm` for more human-like speech.
    - Longer prompts often produce more natural results.
    - Adjust the temperature slider to control variation in speech patterns.
    """)
    with gr.Row():
        with gr.Column(scale=3):
            text_input = gr.Textbox(
                label="Text to speak", 
                placeholder="Enter your text here...",
                lines=5
            )
            voice = gr.Dropdown(
                choices=VOICES, 
                value="tara", 
                label="Voice"
            )
            with gr.Accordion("Advanced Settings", open=False):
                temperature = gr.Slider(
                    minimum=0.1, maximum=1.5, value=0.6, step=0.05,
                    label="Temperature",
                    info="Higher values (0.7-1.0) create more expressive but less stable speech"
                )
                top_p = gr.Slider(
                    minimum=0.1, maximum=1.0, value=0.95, step=0.05,
                    label="Top P",
                    info="Nucleus sampling threshold"
                )
                repetition_penalty = gr.Slider(
                    minimum=1.0, maximum=2.0, value=1.1, step=0.05,
                    label="Repetition Penalty",
                    info="Higher values discourage repetitive patterns"
                )
                max_new_tokens = gr.Slider(
                    minimum=100, maximum=2000, value=1200, step=100,
                    label="Max Length",
                    info="Maximum length of generated audio (in tokens)"
                )
            with gr.Row():
                submit_btn = gr.Button("Generate Speech", variant="primary")
                clear_btn = gr.Button("Clear")
        with gr.Column(scale=2):
            audio_output = gr.Audio(label="Generated Speech", type="numpy")
    
    gr.Examples(
        examples=examples,
        inputs=[text_input, voice, temperature, top_p, repetition_penalty, max_new_tokens],
        outputs=audio_output,
        fn=generate_speech,
        cache_examples=True,
    )
    
    submit_btn.click(
        fn=generate_speech,
        inputs=[text_input, voice, temperature, top_p, repetition_penalty, max_new_tokens],
        outputs=audio_output
    )
    clear_btn.click(
        fn=lambda: (None, None),
        inputs=[],
        outputs=[text_input, audio_output]
    )

# Launch the Gradio app
if __name__ == "__main__":
    demo.queue().launch(share=False, ssr_mode=False)