app.py

import torch  # isort:skip
torch.manual_seed(42)
import json
import re
import unicodedata
from types import SimpleNamespace
import numpy as np
import regex
import gradio as gr
from models import Vocoder, SynthesizerTrn


config_file = "config.json"
vocoder_model_path = "melgan.pth"
tts_model_path = "best_model_363794.pth"
phone_set_file = "vbx_phone_set.json"
device = "cuda" if torch.cuda.is_available() else "cpu"
with open(config_file, "rb") as f:
    hps = json.load(f, object_hook=lambda x: SimpleNamespace(**x))

# load phone set json file
with open(phone_set_file, "r") as f:
    phone_set = json.load(f)

assert phone_set[0][1:-1] == "SEP"
assert "sil" in phone_set
sil_idx = phone_set.index("sil")

space_re = regex.compile(r"\s+")
number_re = regex.compile("([0-9]+)")
digits = ["không", "một", "hai", "ba", "bốn", "năm", "sáu", "bảy", "tám", "chín"]
num_re = regex.compile(r"([0-9.,]*[0-9])")
alphabet = "aàáảãạăằắẳẵặâầấẩẫậeèéẻẽẹêềếểễệiìíỉĩịoòóỏõọôồốổỗộơờớởỡợuùúủũụưừứửữựyỳýỷỹỵbcdđghklmnpqrstvx"
keep_text_and_num_re = regex.compile(rf"[^\s{alphabet}.,0-9]")
keep_text_re = regex.compile(rf"[^\s{alphabet}]")


def read_number(num: str) -> str:
    if len(num) == 1:
        return digits[int(num)]
    elif len(num) == 2 and num.isdigit():
        n = int(num)
        end = digits[n % 10]
        if n == 10:
            return "mười"
        if n % 10 == 5:
            end = "lăm"
        if n % 10 == 0:
            return digits[n // 10] + " mươi"
        elif n < 20:
            return "mười " + end
        else:
            if n % 10 == 1:
                end = "mốt"
            return digits[n // 10] + " mươi " + end
    elif len(num) == 3 and num.isdigit():
        n = int(num)
        if n % 100 == 0:
            return digits[n // 100] + " trăm"
        elif num[1] == "0":
            return digits[n // 100] + " trăm lẻ " + digits[n % 100]
        else:
            return digits[n // 100] + " trăm " + read_number(num[1:])
    elif len(num) >= 4 and len(num) <= 6 and num.isdigit():
        n = int(num)
        n1 = n // 1000
        return read_number(str(n1)) + " ngàn " + read_number(num[-3:])
    elif "," in num:
        n1, n2 = num.split(",")
        return read_number(n1) + " phẩy " + read_number(n2)
    elif "." in num:
        parts = num.split(".")
        if len(parts) == 2:
            if parts[1] == "000":
                return read_number(parts[0]) + " ngàn"
            elif parts[1].startswith("00"):
                end = digits[int(parts[1][2:])]
                return read_number(parts[0]) + " ngàn lẻ " + end
            else:
                return read_number(parts[0]) + " ngàn " + read_number(parts[1])
        elif len(parts) == 3:
            return (
                read_number(parts[0])
                + " triệu "
                + read_number(parts[1])
                + " ngàn "
                + read_number(parts[2])
            )
    return num


def text_to_phone_idx(text):
    # lowercase
    text = text.lower()
    # unicode normalize
    text = unicodedata.normalize("NFKC", text)
    text = text.replace(".", " . ")
    text = text.replace(",", " , ")
    text = text.replace(";", " ; ")
    text = text.replace(":", " : ")
    text = text.replace("!", " ! ")
    text = text.replace("?", " ? ")
    text = text.replace("(", " ( ")

    text = num_re.sub(r" \1 ", text)
    words = text.split()
    words = [read_number(w) if num_re.fullmatch(w) else w for w in words]
    text = " ".join(words)

    # remove redundant spaces
    text = re.sub(r"\s+", " ", text)
    # remove leading and trailing spaces
    text = text.strip()
    # convert words to phone indices
    tokens = []
    for c in text:
        # if c is "," or ".", add <sil> phone
        if c in ":,.!?;(":
            tokens.append(sil_idx)
        elif c in phone_set:
            tokens.append(phone_set.index(c))
        elif c == " ":
            # add <sep> phone
            tokens.append(0)
    if tokens[0] != sil_idx:
        # insert <sil> phone at the beginning
        tokens = [sil_idx, 0] + tokens
    if tokens[-1] != sil_idx:
        tokens = tokens + [0, sil_idx]
    return tokens


def text_to_speech(vocoder, generator, text):
    # prevent too long text
    if len(text) > 500:
        text = text[:500]

    phone_idx = text_to_phone_idx(text)
    batch = {
        "phone_idx": np.array([phone_idx]),
        "phone_length": np.array([len(phone_idx)]),
    }

    # predict phoneme duration
    phone_length = torch.from_numpy(batch["phone_length"].copy()).long().to(device)
    phone_idx = torch.from_numpy(batch["phone_idx"].copy()).long().to(device)
    with torch.inference_mode():
        phone_duration = vocoder(phone_idx, phone_length)[:, :, 0] * 1000
    phone_duration = torch.where(
        phone_idx == sil_idx, torch.clamp_min(phone_duration, 200), phone_duration
    )
    phone_duration = torch.where(phone_idx == 0, 0, phone_duration)

    # generate waveform
    end_time = torch.cumsum(phone_duration, dim=-1)
    start_time = end_time - phone_duration
    start_frame = start_time / 1000 * hps.data.sampling_rate / hps.data.hop_length
    end_frame = end_time / 1000 * hps.data.sampling_rate / hps.data.hop_length
    spec_length = end_frame.max(dim=-1).values
    pos = torch.arange(0, spec_length.item(), device=device)
    attn = torch.logical_and(
        pos[None, :, None] >= start_frame[:, None, :],
        pos[None, :, None] < end_frame[:, None, :],
    ).float()
    with torch.inference_mode():
        y_hat = generator.infer(
            phone_idx, phone_length, spec_length, attn, max_len=None, noise_scale=0.667
        )[0]
    wave = y_hat[0, 0].data.cpu().numpy()
    return (wave * (2**15)).astype(np.int16)


def load_models():
    vocoder = Vocoder(hps.data.vocab_size, 64, 4).to(device)
    vocoder.load_state_dict(torch.load(vocoder_model_path, map_location=device))
    vocoder = vocoder.eval()
    generator = SynthesizerTrn(
        hps.data.vocab_size,
        hps.data.filter_length // 2 + 1,
        hps.train.segment_size // hps.data.hop_length,
        **vars(hps.model),
    ).to(device)
    del generator.enc_q
    ckpt = torch.load(tts_model_path, map_location=device)
    params = {}
    for k, v in ckpt["net_g"].items():
        k = k[7:] if k.startswith("module.") else k
        params[k] = v
    generator.load_state_dict(params, strict=False)
    del ckpt, params
    generator = generator.eval()
    return vocoder, generator


def speak(text):
    vocoder, generator = load_models()
    paragraphs = text.split("\n")
    clips = [] 
    for paragraph in paragraphs:
        paragraph = paragraph.strip()
        if paragraph == "":
            continue
        clips.append(text_to_speech(vocoder, generator, paragraph))
    y = np.concatenate(clips)
    return hps.data.sampling_rate, y

title = 'Educa Text to Speech'

gr.Interface(
    fn=speak,
    inputs="text",
    outputs="audio",
    title=title,
    examples=[
        "Xin chào, đây là một thử nghiệm tổng hợp giọng nói tới từ công ty cổ phần giáo dục ê đu ca.",
    ],
    theme="default",
    allow_screenshot=False,
    allow_flagging="never",
).launch(debug=False)