app.py

from spaces import GPU
import torch
from transformers import AutoTokenizer, AutoModelForCausalLM
from peft import PeftModel
from snac import SNAC
import gradio as gr
import os

# Autenticación Hugging Face para modelo privado
from huggingface_hub import login
hf_token = os.environ.get("HF_TOKEN")
if hf_token:
    login(token=hf_token)

# Config
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
base_model_id = "canopylabs/3b-es_it-pretrain-research_release"
lora_model_id = "sirekist98/spanish_conversational_tts"
snac_model_id = "hubertsiuzdak/snac_24khz"

# Load models
tokenizer = AutoTokenizer.from_pretrained(base_model_id, use_auth_token=True)
base_model = AutoModelForCausalLM.from_pretrained(
    base_model_id,
    torch_dtype=torch.float16 if device.type == "cuda" else torch.float32,
    use_auth_token=True
)
model = PeftModel.from_pretrained(base_model, lora_model_id, use_auth_token=True)
model = model.to(device)
model.eval()

snac_model = SNAC.from_pretrained(snac_model_id).to(device)

# Speakers
speakers = [
    "Alex", "Carmen", "Daniel", "Diego", "Hugo", "Lucía", "María", "Pablo", "Sofía"
]

# Helper to decode tokens to audio
def decode_snac(code_list):
    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))

    device_snac = snac_model.quantizer.quantizers[0].codebook.weight.device
    layers = [
        torch.tensor(layer_1).unsqueeze(0).to(device_snac),
        torch.tensor(layer_2).unsqueeze(0).to(device_snac),
        torch.tensor(layer_3).unsqueeze(0).to(device_snac),
    ]

    with torch.no_grad():
        audio = snac_model.decode(layers).squeeze().cpu().numpy()
    return audio

# Inference
@GPU
def tts(prompt, speaker):
    full_prompt = f"{speaker}: {prompt}"
    input_ids = tokenizer(full_prompt, return_tensors="pt").input_ids.to(device)

    start_token = torch.tensor([[128259]], dtype=torch.long).to(device)
    end_tokens = torch.tensor([[128009, 128260]], dtype=torch.long).to(device)

    input_ids = torch.cat([start_token, input_ids, end_tokens], dim=1)

    padding_len = max(0, 4260 - input_ids.shape[1])
    if padding_len > 0:
        pad = torch.full((1, padding_len), 128263, dtype=torch.long).to(device)
        input_ids = torch.cat([pad, input_ids], dim=1)
        attention_mask = torch.cat([
            torch.zeros((1, padding_len), dtype=torch.long),
            torch.ones((1, input_ids.shape[1]-padding_len), dtype=torch.long)
        ], dim=1).to(device)
    else:
        attention_mask = torch.ones_like(input_ids, dtype=torch.long).to(device)

    with torch.no_grad():
        generated_ids = model.generate(
            input_ids=input_ids,
            attention_mask=attention_mask,
            max_new_tokens=1200,
            do_sample=True,
            temperature=0.6,
            top_p=0.95,
            repetition_penalty=1.1,
            num_return_sequences=1,
            eos_token_id=128258,
            use_cache=True,
        )

    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 = generated_ids[:, last_occurrence_idx+1:]
    else:
        cropped = generated_ids

    cleaned = cropped[cropped != token_to_remove]
    trimmed = cleaned[: (len(cleaned) // 7) * 7]
    trimmed = [int(t) - 128266 for t in trimmed]

    audio = decode_snac(trimmed)
    return (24000, audio)

# Gradio UI
with gr.Blocks() as demo:
    gr.Markdown("# 🗣️ Orpheus Spanish TTS — sin emociones\nSelecciona un *speaker* y escribe el texto.")
    with gr.Row():
        with gr.Column():
            text_input = gr.Textbox(label="Texto", placeholder="Escribe aquí el texto a locutar")
            speaker_dropdown = gr.Dropdown(choices=speakers, value=speakers[0], label="Speaker")
            submit_btn = gr.Button("Generar audio")
        with gr.Column():
            audio_output = gr.Audio(label="Audio generado", type="numpy")

    submit_btn.click(
        fn=tts,
        inputs=[text_input, speaker_dropdown],
        outputs=audio_output,
    )

demo.queue().launch(show_error=True)