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使用 Tacotron2 的文本转语音¶

作者 Yao-Yuan Yang， Moto Hira

概述¶

本教程介绍如何使用在 torchaudio 中预训练 Tacotron2。

文本转语音管道如下所示：

文本预处理

首先，将输入文本编码为元件列表。在这个教程中，我们将使用英文字符和音素作为符号。
频谱图生成

从编码的文本中，生成频谱图。为此，我们使用 model。Tacotron2
时域转换

最后一步是将频谱图转换为波形。这从频谱图生成语音的过程也称为 Vocoder。在本教程中，使用了三种不同的声码器，WaveRNN、Griffin-Lim、和 Nvidia 的 WaveGlow。

整个过程如下图所示。

https://download.pytorch.org/torchaudio/tutorial-assets/tacotron2_tts_pipeline.png

所有相关组件都捆绑在中。但本教程还将介绍幕后过程。

制备¶

首先，我们安装必要的依赖项。除了之外，还需要执行基于音素的编码。torchaudioDeepPhonemizer

# When running this example in notebook, install DeepPhonemizer
# !pip3 install deep_phonemizer

import torch
import torchaudio
import matplotlib
import matplotlib.pyplot as plt

import IPython

matplotlib.rcParams['figure.figsize'] = [16.0, 4.8]

torch.random.manual_seed(0)
device = "cuda" if torch.cuda.is_available() else "cpu"

print(torch.__version__)
print(torchaudio.__version__)
print(device)

外：

1.10.0+cpu
0.10.0+cpu
cpu

文本处理¶

基于字符的编码¶

在本节中，我们将介绍如何使用基于字符的编码工程。

由于预训练的 Tacotron2 模型需要一组特定的符号表中，其功能与中提供的功能相同。这部分更多地用于解释编码的基础。torchaudio

首先，我们定义品种集。例如，我们可以使用 .然后，我们将映射输入文本的每个字符都放入相应的符号。'_-!\'(),.:;? abcdefghijklmnopqrstuvwxyz'

以下是此类处理的示例。在示例中，symbol 不在表中的 API 的 URL 将被忽略。

symbols = '_-!\'(),.:;? abcdefghijklmnopqrstuvwxyz'
look_up = {s: i for i, s in enumerate(symbols)}
symbols = set(symbols)

def text_to_sequence(text):
  text = text.lower()
  return [look_up[s] for s in text if s in symbols]

text = "Hello world! Text to speech!"
print(text_to_sequence(text))

外：

[19, 16, 23, 23, 26, 11, 34, 26, 29, 23, 15, 2, 11, 31, 16, 35, 31, 11, 31, 26, 11, 30, 27, 16, 16, 14, 19, 2]

如上所述，symbol table 和 indices 必须匹配预训练的 Tacotron2 模型期望什么。提供 transform 与预训练模型一起。例如，您可以 instantiate 并使用 type 的 Transform，如下所示。torchaudio

processor = torchaudio.pipelines.TACOTRON2_WAVERNN_CHAR_LJSPEECH.get_text_processor()

text = "Hello world! Text to speech!"
processed, lengths = processor(text)

print(processed)
print(lengths)

外：

tensor([[19, 16, 23, 23, 26, 11, 34, 26, 29, 23, 15,  2, 11, 31, 16, 35, 31, 11,
         31, 26, 11, 30, 27, 16, 16, 14, 19,  2]])
tensor([28], dtype=torch.int32)

该对象将文本或文本列表作为输入。当提供文本列表时，返回的变量表示输出中每个已处理令牌的有效长度批。processorlengths

可以按如下方式检索中间表示。

print([processor.tokens[i] for i in processed[0, :lengths[0]]])

外：

['h', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd', '!', ' ', 't', 'e', 'x', 't', ' ', 't', 'o', ' ', 's', 'p', 'e', 'e', 'c', 'h', '!']

基于音素的编码¶

基于音素的编码类似于基于字符的编码，但它使用基于音素的符号表和 G2P （字素到音素）型。

G2P 模型的细节不在本教程的讨论范围之内，我们将看看转换是什么样子的就知道了。

与基于字符的编码类似，编码过程是预期与预先训练的 Tacotron2 模型的训练对象相匹配。具有用于创建流程的接口。torchaudio

下面的代码说明了如何创建和使用该过程。后场景中，使用 package 创建 G2P 模型，并且作者发布的预训练权重 is 获取。DeepPhonemizerDeepPhonemizer

bundle = torchaudio.pipelines.TACOTRON2_WAVERNN_PHONE_LJSPEECH

processor = bundle.get_text_processor()

text = "Hello world! Text to speech!"
with torch.inference_mode():
  processed, lengths = processor(text)

print(processed)
print(lengths)

外：

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tensor([[54, 20, 65, 69, 11, 92, 44, 65, 38,  2, 11, 81, 40, 64, 79, 81, 11, 81,
         20, 11, 79, 77, 59, 37,  2]])
tensor([25], dtype=torch.int32)

请注意，编码值与基于字符的编码。

中间表示形式如下所示。

print([processor.tokens[i] for i in processed[0, :lengths[0]]])

外：

['HH', 'AH', 'L', 'OW', ' ', 'W', 'ER', 'L', 'D', '!', ' ', 'T', 'EH', 'K', 'S', 'T', ' ', 'T', 'AH', ' ', 'S', 'P', 'IY', 'CH', '!']

频谱图生成¶

Tacotron2是我们用来从编码文本。型号详情请参考纸。

使用预训练权重实例化 Tacotron2 模型很容易，但是，请注意，需要处理 Tacotron2 模型的输入通过匹配的文本处理器。

捆绑匹配的模型和处理器组合在一起，以便轻松创建管道。

有关可用捆绑包及其用法，请参阅。

bundle = torchaudio.pipelines.TACOTRON2_WAVERNN_PHONE_LJSPEECH
processor = bundle.get_text_processor()
tacotron2 = bundle.get_tacotron2().to(device)

text = "Hello world! Text to speech!"

with torch.inference_mode():
  processed, lengths = processor(text)
  processed = processed.to(device)
  lengths = lengths.to(device)
  spec, _, _ = tacotron2.infer(processed, lengths)


plt.imshow(spec[0].cpu().detach())

外：

Downloading: "https://download.pytorch.org/torchaudio/models/tacotron2_english_phonemes_1500_epochs_wavernn_ljspeech.pth" to /root/.cache/torch/hub/checkpoints/tacotron2_english_phonemes_1500_epochs_wavernn_ljspeech.pth

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<matplotlib.image.AxesImage object at 0x7fb3cc9ca220>

请注意，method perfos multinomial sampling，因此，生成频谱图的过程会产生随机性。Tacotron2.infer

fig, ax = plt.subplots(3, 1, figsize=(16, 4.3 * 3))
for i in range(3):
  with torch.inference_mode():
    spec, spec_lengths, _ = tacotron2.infer(processed, lengths)
  print(spec[0].shape)
  ax[i].imshow(spec[0].cpu().detach())
plt.show()

外：

torch.Size([80, 155])
torch.Size([80, 167])
torch.Size([80, 164])

波形生成¶

生成频谱图后，最后一个过程是恢复 waveform 来自频谱图。

torchaudio提供基于和的声码器。GriffinLimWaveRNN

WaveRNN¶

继续上一节，我们可以实例化匹配的 WaveRNN 模型。

bundle = torchaudio.pipelines.TACOTRON2_WAVERNN_PHONE_LJSPEECH

processor = bundle.get_text_processor()
tacotron2 = bundle.get_tacotron2().to(device)
vocoder = bundle.get_vocoder().to(device)

text = "Hello world! Text to speech!"

with torch.inference_mode():
  processed, lengths = processor(text)
  processed = processed.to(device)
  lengths = lengths.to(device)
  spec, spec_lengths, _ = tacotron2.infer(processed, lengths)
  waveforms, lengths = vocoder(spec, spec_lengths)

fig, [ax1, ax2] = plt.subplots(2, 1, figsize=(16, 9))
ax1.imshow(spec[0].cpu().detach())
ax2.plot(waveforms[0].cpu().detach())

torchaudio.save("_assets/output_wavernn.wav", waveforms[0:1].cpu(), sample_rate=vocoder.sample_rate)
IPython.display.Audio("_assets/output_wavernn.wav")

外：

Downloading: "https://download.pytorch.org/torchaudio/models/wavernn_10k_epochs_8bits_ljspeech.pth" to /root/.cache/torch/hub/checkpoints/wavernn_10k_epochs_8bits_ljspeech.pth

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林磊¶

使用 Griffin-Lim 声码器与 WaveRNN 相同。您可以实例化 vocode 对象和 method 并传递 spectrogram。get_vocoder

bundle = torchaudio.pipelines.TACOTRON2_GRIFFINLIM_PHONE_LJSPEECH

processor = bundle.get_text_processor()
tacotron2 = bundle.get_tacotron2().to(device)
vocoder = bundle.get_vocoder().to(device)

with torch.inference_mode():
  processed, lengths = processor(text)
  processed = processed.to(device)
  lengths = lengths.to(device)
  spec, spec_lengths, _ = tacotron2.infer(processed, lengths)
waveforms, lengths = vocoder(spec, spec_lengths)

fig, [ax1, ax2] = plt.subplots(2, 1, figsize=(16, 9))
ax1.imshow(spec[0].cpu().detach())
ax2.plot(waveforms[0].cpu().detach())

torchaudio.save("_assets/output_griffinlim.wav", waveforms[0:1].cpu(), sample_rate=vocoder.sample_rate)
IPython.display.Audio("_assets/output_griffinlim.wav")

外：

Downloading: "https://download.pytorch.org/torchaudio/models/tacotron2_english_phonemes_1500_epochs_ljspeech.pth" to /root/.cache/torch/hub/checkpoints/tacotron2_english_phonemes_1500_epochs_ljspeech.pth

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波辉¶

Waveglow 是 Nvidia 发布的声码器。预训练权重为在 Torch Hub 上发布。可以使用 module 实例化模型。torch.hub

# Workaround to load model mapped on GPU
# https://stackoverflow.com/a/61840832
waveglow = torch.hub.load('NVIDIA/DeepLearningExamples:torchhub', 'nvidia_waveglow', model_math='fp32', pretrained=False)
checkpoint = torch.hub.load_state_dict_from_url('https://api.ngc.nvidia.com/v2/models/nvidia/waveglowpyt_fp32/versions/1/files/nvidia_waveglowpyt_fp32_20190306.pth', progress=False, map_location=device)
state_dict = {key.replace("module.", ""): value for key, value in checkpoint["state_dict"].items()}

waveglow.load_state_dict(state_dict)
waveglow = waveglow.remove_weightnorm(waveglow)
waveglow = waveglow.to(device)
waveglow.eval()

with torch.no_grad():
  waveforms = waveglow.infer(spec)

fig, [ax1, ax2] = plt.subplots(2, 1, figsize=(16, 9))
ax1.imshow(spec[0].cpu().detach())
ax2.plot(waveforms[0].cpu().detach())

torchaudio.save("_assets/output_waveglow.wav", waveforms[0:1].cpu(), sample_rate=22050)
IPython.display.Audio("_assets/output_waveglow.wav")

外：

Downloading: "https://github.com/NVIDIA/DeepLearningExamples/archive/torchhub.zip" to /root/.cache/torch/hub/torchhub.zip
/root/.cache/torch/hub/NVIDIA_DeepLearningExamples_torchhub/PyTorch/Classification/ConvNets/image_classification/models/common.py:13: UserWarning: pytorch_quantization module not found, quantization will not be available
  warnings.warn(
/root/.cache/torch/hub/NVIDIA_DeepLearningExamples_torchhub/PyTorch/Classification/ConvNets/image_classification/models/efficientnet.py:17: UserWarning: pytorch_quantization module not found, quantization will not be available
  warnings.warn(
/root/.cache/torch/hub/NVIDIA_DeepLearningExamples_torchhub/PyTorch/SpeechSynthesis/Tacotron2/waveglow/model.py:55: UserWarning: torch.qr is deprecated in favor of torch.linalg.qr and will be removed in a future PyTorch release.
The boolean parameter 'some' has been replaced with a string parameter 'mode'.
Q, R = torch.qr(A, some)
should be replaced with
Q, R = torch.linalg.qr(A, 'reduced' if some else 'complete') (Triggered internally at  ../aten/src/ATen/native/BatchLinearAlgebra.cpp:1937.)
  W = torch.qr(torch.FloatTensor(c, c).normal_())[0]
Downloading: "https://api.ngc.nvidia.com/v2/models/nvidia/waveglowpyt_fp32/versions/1/files/nvidia_waveglowpyt_fp32_20190306.pth" to /root/.cache/torch/hub/checkpoints/nvidia_waveglowpyt_fp32_20190306.pth

脚本总运行时间：（2 分 35.062 秒）

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