TensorFlowTTS: :stuck_out_tongue_closed_eyes: TensorFlowTTS: Real-Time State-of-the-art Speech Synthesis for Tensorflow 2 (supported including English, Korean, Chinese, German and Easy to adapt for other languages)

<h2 align="center">
<p> :yum: TensorFlowTTS
<p align="center">
    <a href="https://github.com/tensorspeech/TensorFlowTTS/actions">
        <img alt="Build" src="https://github.com/tensorspeech/TensorFlowTTS/workflows/CI/badge.svg?branch=master">
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    <a href="https://github.com/tensorspeech/TensorFlowTTS/blob/master/LICENSE">
        <img alt="GitHub" src="https://img.shields.io/github/license/tensorspeech/TensorflowTTS?color=red">
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    <a href="https://colab.research.google.com/drive/1akxtrLZHKuMiQup00tzO2olCaN-y3KiD?usp=sharing">
        <img alt="Colab" src="https://colab.research.google.com/assets/colab-badge.svg">
    </a>
</p>
</h2>
<h2 align="center">
<p>Real-Time State-of-the-art Speech Synthesis for Tensorflow 2
</h2>

:zany_face: TensorFlowTTS provides real-time state-of-the-art speech synthesis architectures such as Tacotron-2, Melgan, Multiband-Melgan, FastSpeech, FastSpeech2 based-on TensorFlow 2. With Tensorflow 2, we can speed-up training/inference progress, optimizer further by using [fake-quantize aware](https://www.tensorflow.org/model_optimization/guide/quantization/training_comprehensive_guide) and [pruning](https://www.tensorflow.org/model_optimization/guide/pruning/pruning_with_keras), make TTS models can be run faster than real-time and be able to deploy on mobile devices or embedded systems.

## What's new
- 2020/12/02 **(NEW!)** Support German TTS with [Thorsten dataset](https://github.com/thorstenMueller/deep-learning-german-tts). See the [Colab](https://colab.research.google.com/drive/1W0nSFpsz32M0OcIkY9uMOiGrLTPKVhTy?usp=sharing). Thanks [thorstenMueller](https://github.com/thorstenMueller) and [monatis](https://github.com/monatis).
- 2020/11/24 **(NEW!)** Add HiFi-GAN vocoder. See [here](https://github.com/TensorSpeech/TensorFlowTTS/tree/master/examples/hifigan)
- 2020/11/19 **(NEW!)** Add Multi-GPU gradient accumulator. See [here](https://github.com/TensorSpeech/TensorFlowTTS/pull/377)
- 2020/08/23  Add Parallel WaveGAN tensorflow implementation. See [here](https://github.com/TensorSpeech/TensorFlowTTS/tree/master/examples/parallel_wavegan)
- 2020/08/23 Add MBMelGAN G + ParallelWaveGAN G example. See [here](https://github.com/TensorSpeech/TensorFlowTTS/tree/master/examples/multiband_pwgan)
- 2020/08/20  Add C++ inference code. Thank [@ZDisket](https://github.com/ZDisket). See [here](https://github.com/TensorSpeech/TensorFlowTTS/tree/master/examples/cppwin)
- 2020/08/18 Update [new base processor](https://github.com/TensorSpeech/TensorFlowTTS/blob/master/tensorflow_tts/processor/base_processor.py). Add [AutoProcessor](https://github.com/TensorSpeech/TensorFlowTTS/blob/master/tensorflow_tts/inference/auto_processor.py) and [pretrained processor](https://github.com/TensorSpeech/TensorFlowTTS/blob/master/tensorflow_tts/processor/pretrained/) json file
- 2020/08/14 Support Chinese TTS. Pls see the [colab](https://colab.research.google.com/drive/1YpSHRBRPBI7cnTkQn1UcVTWEQVbsUm1S?usp=sharing). Thank [@azraelkuan](https://github.com/azraelkuan)
- 2020/08/05 Support Korean TTS. Pls see the [colab](https://colab.research.google.com/drive/1ybWwOS5tipgPFttNulp77P6DAB5MtiuN?usp=sharing). Thank [@crux153](https://github.com/crux153)
- 2020/07/17 Support MultiGPU for all Trainer
- 2020/07/05 Support Convert Tacotron-2, FastSpeech to Tflite. Pls see the [colab](https://colab.research.google.com/drive/1HudLLpT9CQdh2k04c06bHUwLubhGTWxA?usp=sharing). Thank @jaeyoo from the TFlite team for his support
- 2020/06/20 [FastSpeech2](https://arxiv.org/abs/2006.04558) implementation with Tensorflow is supported.
- 2020/06/07 [Multi-band MelGAN (MB MelGAN)](https://github.com/tensorspeech/TensorFlowTTS/blob/master/examples/multiband_melgan/) implementation with Tensorflow is supported

## Features
- High performance on Speech Synthesis.
- Be able to fine-tune on other languages.
- Fast, Scalable, and Reliable.
- Suitable for deployment.
- Easy to implement a new model, based-on abstract class.
- Mixed precision to speed-up training if possible.
- Support Single/Multi GPU gradient Accumulate.
- Support both Single/Multi GPU in base trainer class.
- TFlite conversion for all supported models.
- Android example.
- Support many languages (currently, we support Chinese, Korean, English.)
- Support C++ inference.
- Support Convert weight for some models from PyTorch to TensorFlow to accelerate speed.

## Requirements
This repository is tested on Ubuntu 18.04 with:

- Python 3.7+
- Cuda 10.1
- CuDNN 7.6.5
- Tensorflow 2.2/2.3
- [Tensorflow Addons](https://github.com/tensorflow/addons) >= 0.10.0

Different Tensorflow version should be working but not tested yet. This repo will try to work with the latest stable TensorFlow version. **We recommend you install TensorFlow 2.3.0 to training in case you want to use MultiGPU.**

## Installation
### With pip
```bash
$ pip install TensorFlowTTS
```
### From source
Examples are included in the repository but are not shipped with the framework. Therefore, to run the latest version of examples, you need to install the source below.
```bash
$ git clone https://github.com/TensorSpeech/TensorFlowTTS.git
$ cd TensorFlowTTS
$ pip install .
```
If you want to upgrade the repository and its dependencies:
```bash
$ git pull
$ pip install --upgrade .
```

# Supported Model architectures
TensorFlowTTS currently  provides the following architectures:

1. **MelGAN** released with the paper [MelGAN: Generative Adversarial Networks for Conditional Waveform Synthesis](https://arxiv.org/abs/1910.06711) by Kundan Kumar, Rithesh Kumar, Thibault de Boissiere, Lucas Gestin, Wei Zhen Teoh, Jose Sotelo, Alexandre de Brebisson, Yoshua Bengio, Aaron Courville.
2. **Tacotron-2** released with the paper [Natural TTS Synthesis by Conditioning WaveNet on Mel Spectrogram Predictions](https://arxiv.org/abs/1712.05884) by Jonathan Shen, Ruoming Pang, Ron J. Weiss, Mike Schuster, Navdeep Jaitly, Zongheng Yang, Zhifeng Chen, Yu Zhang, Yuxuan Wang, RJ Skerry-Ryan, Rif A. Saurous, Yannis Agiomyrgiannakis, Yonghui Wu.
3. **FastSpeech** released with the paper [FastSpeech: Fast, Robust, and Controllable Text to Speech](https://arxiv.org/abs/1905.09263) by Yi Ren, Yangjun Ruan, Xu Tan, Tao Qin, Sheng Zhao, Zhou Zhao, Tie-Yan Liu.
4. **Multi-band MelGAN** released with the paper [Multi-band MelGAN: Faster Waveform Generation for High-Quality Text-to-Speech](https://arxiv.org/abs/2005.05106) by Geng Yang, Shan Yang, Kai Liu, Peng Fang, Wei Chen, Lei Xie.
5. **FastSpeech2** released with the paper [FastSpeech 2: Fast and High-Quality End-to-End Text to Speech](https://arxiv.org/abs/2006.04558) by Yi Ren, Chenxu Hu, Xu Tan, Tao Qin, Sheng Zhao, Zhou Zhao, Tie-Yan Liu.
6. **Parallel WaveGAN** released with the paper [Parallel WaveGAN: A fast waveform generation model based on generative adversarial networks with multi-resolution spectrogram](https://arxiv.org/abs/1910.11480) by Ryuichi Yamamoto, Eunwoo Song, Jae-Min Kim.
7. **HiFi-GAN** released with the paper [HiFi-GAN: Generative Adversarial Networks for Efficient and High Fidelity Speech Synthesis](https://arxiv.org/abs/2010.05646) by Jungil Kong, Jaehyeon Kim, Jaekyoung Bae.

We are also implementing some techniques to improve quality and convergence speed from the following papers:

2. **Guided Attention Loss** released with the paper [Efficiently Trainable Text-to-Speech System Based on Deep Convolutional Networks with Guided Attention
](https://arxiv.org/abs/1710.08969) by Hideyuki Tachibana, Katsuya Uenoyama, Shunsuke Aihara.

# Audio Samples
Here in an audio samples on valid set. [tacotron-2](https://drive.google.com/open?id=1kaPXRdLg9gZrll9KtvH3-feOBMM8sn3_), [fastspeech](https://drive.google.com/open?id=1f69ujszFeGnIy7PMwc8AkUckhIaT2OD0), [melgan](https://drive.google.com/open?id=1mBwGVchwtNkgFsURl7g4nMiqx4gquAC2), [melgan.stft](https://drive.google.com/open?id=1xUkDjbciupEkM3N4obiJAYySTo6J9z6b), [fastspeech2](https://drive.google.com/drive/u/1/folders/1NG7oOfNuXSh7WyAoM1hI8P5BxDALY_mU), [multiband_melgan](https://drive.google.com/drive/folders/1DCV3sa6VTyoJzZmKATYvYVDUAFXlQ_Zp)

# Tutorial End-to-End

## Prepare Dataset

Where `metadata.csv` has the following format: `id|transcription`. This is a ljspeech-like format; you can ignore preprocessing steps if you have other format datasets.

Note that `NAME_DATASET` should be `[ljspeech/kss/baker/libritts]` for example.

## Preprocessing

The preprocessing has two steps:

1. Preprocess audio features
    - Convert characters to IDs
    - Compute mel spectrograms
    - Normalize mel spectrograms to [-1, 1] range
    - Split the dataset into train and validation
    - Compute the mean and standard deviation of multiple features from the **training** split
2. Standardize mel spectrogram based on computed statistics

To reproduce the steps above:
```
tensorflow-tts-preprocess --rootdir ./[ljspeech/kss/baker/libritts/thorsten] --outdir ./dump_[ljspeech/kss/baker/libritts/thorsten] --config preprocess/[ljspeech/kss/baker/thorsten]_preprocess.yaml --dataset [ljspeech/kss/baker/libritts/thorsten]
tensorflow-tts-normalize --rootdir ./dump_[ljspeech/kss/baker/libritts/thorsten] --outdir ./dump_[ljspeech/kss/baker/libritts/thorsten] --config preprocess/[ljspeech/kss/baker/libritts/thorsten]_preprocess.yaml --dataset [ljspeech/kss/baker/libritts/thorsten]
```

Right now we only support [`ljspeech`](https://keithito.com/LJ-Speech-Dataset/), [`kss`](https://www.kaggle.com/bryanpark/korean-single-speaker-speech-dataset), [`baker`](https://weixinxcxdb.oss-cn-beijing.aliyuncs.com/gwYinPinKu/BZNSYP.rar), [`libritts`](http://www.openslr.org/60/) and [`thorsten`](https://github.com/thorstenMueller/deep-learning-german-tts) for dataset argument. In the future, we intend to support more datasets.

**Note**: To run `libritts` preprocessing, please first read the instruction in [examples/fastspeech2_libritts](https://github.com/TensorSpeech/TensorFlowTTS/tree/master/examples/fastspeech2_libritts). We need to reformat it first before run preprocessing.

- `stats.npy` contains the mean and std from the training split mel spectrograms
- `stats_energy.npy` contains the mean and std of energy values from the training split
- `stats_f0.npy` contains the mean and std of F0 values in the training split
- `train_utt_ids.npy` / `valid_utt_ids.npy` contains training and validation utterances IDs respectively

We use suffix (`ids`, `raw-feats`, `raw-energy`, `raw-f0`, `norm-feats`, and `wave`) for each input type.

**IMPORTANT NOTES**:
- This preprocessing step is based on [ESPnet](https://github.com/espnet/espnet) so you can combine all models here with other models from ESPnet repository.
- Regardless of how your dataset is formatted, the final structure of the `dump` folder **SHOULD** follow the above structure to be able to use the training script, or you can modify it by yourself 😄.

## Training models

To know how to train model from scratch or fine-tune with other datasets/languages, please see detail at example directory.

- For Tacotron-2 tutorial, pls see [examples/tacotron2](https://github.com/tensorspeech/TensorFlowTTS/tree/master/examples/tacotron2)
- For FastSpeech tutorial, pls see [examples/fastspeech](https://github.com/tensorspeech/TensorFlowTTS/tree/master/examples/fastspeech)
- For FastSpeech2 tutorial, pls see [examples/fastspeech2](https://github.com/tensorspeech/TensorFlowTTS/tree/master/examples/fastspeech2)
- For FastSpeech2 + MFA tutorial, pls see [examples/fastspeech2_libritts](https://github.com/tensorspeech/TensorFlowTTS/tree/master/examples/fastspeech2_libritts)
- For MelGAN tutorial, pls see [examples/melgan](https://github.com/tensorspeech/TensorFlowTTS/tree/master/examples/melgan)
- For MelGAN + STFT Loss tutorial, pls see [examples/melgan.stft](https://github.com/tensorspeech/TensorFlowTTS/tree/master/examples/melgan.stft)
- For Multiband-MelGAN tutorial, pls see [examples/multiband_melgan](https://github.com/tensorspeech/TensorFlowTTS/tree/master/examples/multiband_melgan)
- For Parallel WaveGAN tutorial, pls see [examples/parallel_wavegan](https://github.com/tensorspeech/TensorFlowTTS/tree/master/examples/parallel_wavegan)
- For Multiband-MelGAN Generator + Parallel WaveGAN Discriminator tutorial, pls see [examples/multiband_pwgan](https://github.com/tensorspeech/TensorFlowTTS/tree/master/examples/multiband_pwgan)
- For HiFi-GAN tutorial, pls see [examples/hifigan](https://github.com/tensorspeech/TensorFlowTTS/tree/master/examples/hifigan)
# Abstract Class Explaination

## Abstract DataLoader Tensorflow-based dataset

A detail implementation of abstract dataset class from [tensorflow_tts/dataset/abstract_dataset](https://github.com/tensorspeech/TensorFlowTTS/blob/master/tensorflow_tts/datasets/abstract_dataset.py). There are some functions you need overide and understand:

1. **get_args**: This function return argumentation for **generator** class, normally is utt_ids.
2. **generator**: This function have an inputs from **get_args** function and return a inputs for models. **Note that we return a dictionary for all generator functions with the keys that exactly match with the model's parameters because base_trainer will use model(\*\*batch) to do forward step.**
3. **get_output_dtypes**: This function need return dtypes for each element from **generator** function.
4. **get_len_dataset**: Return len of datasets, normaly is len(utt_ids).

**IMPORTANT NOTES**:

- A pipeline of creating dataset should be: cache -> shuffle -> map_fn -> get_batch -> prefetch.
- If you do shuffle before cache, the dataset won't shuffle when it re-iterate over datasets.
- You should apply map_fn to make each element return from **generator** function have the same length before getting batch and feed it into a model.

Some examples to use this **abstract_dataset** are [tacotron_dataset.py](https://github.com/tensorspeech/TensorFlowTTS/blob/master/examples/tacotron2/tacotron_dataset.py), [fastspeech_dataset.py](https://github.com/tensorspeech/TensorFlowTTS/blob/master/examples/fastspeech/fastspeech_dataset.py), [melgan_dataset.py](https://github.com/tensorspeech/TensorFlowTTS/blob/master/examples/melgan/audio_mel_dataset.py), [fastspeech2_dataset.py](https://github.com/TensorSpeech/TensorFlowTTS/blob/master/examples/fastspeech2/fastspeech2_dataset.py)

## Abstract Trainer Class

A detail implementation of base_trainer from [tensorflow_tts/trainer/base_trainer.py](https://github.com/tensorspeech/TensorFlowTTS/blob/master/tensorflow_tts/trainers/base_trainer.py). It include [Seq2SeqBasedTrainer](https://github.com/tensorspeech/TensorFlowTTS/blob/master/tensorflow_tts/trainers/base_trainer.py#L265) and [GanBasedTrainer](https://github.com/tensorspeech/TensorFlowTTS/blob/master/tensorflow_tts/trainers/base_trainer.py#L149) inherit from [BasedTrainer](https://github.com/tensorspeech/TensorFlowTTS/blob/master/tensorflow_tts/trainers/base_trainer.py#L16). All trainer support both single/multi GPU. There a some functions you **MUST** overide when implement new_trainer:

- **compile**: This function aim to define a models, and losses.
- **generate_and_save_intermediate_result**: This function will save intermediate result such as: plot alignment, save audio generated, plot mel-spectrogram ...
- **compute_per_example_losses**: This function will compute per_example_loss for model, note that all element of the loss **MUST** has shape [batch_size].

All models on this repo are trained based-on **GanBasedTrainer** (see [train_melgan.py](https://github.com/tensorspeech/TensorFlowTTS/blob/master/examples/melgan/train_melgan.py), [train_melgan_stft.py](https://github.com/tensorspeech/TensorFlowTTS/blob/master/examples/melgan.stft/train_melgan_stft.py), [train_multiband_melgan.py](https://github.com/tensorspeech/TensorFlowTTS/blob/master/examples/multiband_melgan/train_multiband_melgan.py)) and **Seq2SeqBasedTrainer** (see [train_tacotron2.py](https://github.com/tensorspeech/TensorFlowTTS/blob/master/examples/tacotron2/train_tacotron2.py), [train_fastspeech.py](https://github.com/tensorspeech/TensorFlowTTS/blob/master/examples/fastspeech/train_fastspeech.py)).

# End-to-End Examples
You can know how to inference each model at [notebooks](https://github.com/tensorspeech/TensorFlowTTS/tree/master/notebooks) or see a [colab](https://colab.research.google.com/drive/1akxtrLZHKuMiQup00tzO2olCaN-y3KiD?usp=sharing) (for English), [colab](https://colab.research.google.com/drive/1ybWwOS5tipgPFttNulp77P6DAB5MtiuN?usp=sharing) (for Korean). Here is an example code for end2end inference with fastspeech and melgan.

```python
import numpy as np
import soundfile as sf
import yaml

import tensorflow as tf

from tensorflow_tts.inference import AutoConfig
from tensorflow_tts.inference import TFAutoModel
from tensorflow_tts.inference import AutoProcessor

# initialize fastspeech model.
fs_config = AutoConfig.from_pretrained('./examples/fastspeech/conf/fastspeech.v1.yaml')
fastspeech = TFAutoModel.from_pretrained(
    config=fs_config,
    pretrained_path="./examples/fastspeech/pretrained/model-195000.h5"
)

# initialize melgan model
melgan_config = AutoConfig.from_pretrained('./examples/melgan/conf/melgan.v1.yaml')
melgan = TFAutoModel.from_pretrained(
    config=melgan_config,
    pretrained_path="./examples/melgan/checkpoint/generator-1500000.h5"
)

# inference
processor = AutoProcessor.from_pretrained(pretrained_path="./test/files/ljspeech_mapper.json")

ids = processor.text_to_sequence("Recent research at Harvard has shown meditating for as little as 8 weeks, can actually increase the grey matter in the parts of the brain responsible for emotional regulation, and learning.")
ids = tf.expand_dims(ids, 0)
# fastspeech inference

masked_mel_before, masked_mel_after, duration_outputs = fastspeech.inference(
    ids,
    speaker_ids=tf.zeros(shape=[tf.shape(ids)[0]], dtype=tf.int32),
    speed_ratios=tf.constant([1.0], dtype=tf.float32)
)

# melgan inference
audio_before = melgan.inference(masked_mel_before)[0, :, 0]
audio_after = melgan.inference(masked_mel_after)[0, :, 0]

# save to file
sf.write('./audio_before.wav', audio_before, 22050, "PCM_16")
sf.write('./audio_after.wav', audio_after, 22050, "PCM_16")
```

# Contact
[Minh Nguyen Quan Anh](https://github.com/tensorspeech): nguyenquananhminh@gmail.com, [erogol](https://github.com/erogol): erengolge@gmail.com, [Kuan Chen](https://github.com/azraelkuan): azraelkuan@gmail.com, [Dawid Kobus](https://github.com/machineko): machineko@protonmail.com, [Takuya Ebata](https://github.com/MokkeMeguru): meguru.mokke@gmail.com, [Trinh Le Quang](https://github.com/l4zyf9x): trinhle.cse@gmail.com, [Yunchao He](https://github.com/candlewill): yunchaohe@gmail.com, [Alejandro Miguel Velasquez](https://github.com/ZDisket): xml506ok@gmail.com

# License
Overall, Almost models here are licensed under the [Apache 2.0](http://www.apache.org/licenses/LICENSE-2.0) for all countries in the world, except in **Viet Nam** this framework cannot be used for production in any way without permission from TensorFlowTTS's Authors. There is an exception, Tacotron-2 can be used with any purpose. If you are Vietnamese and want to use this framework for production, you **Must** contact us in advance.

# Acknowledgement
We want to thank [Tomoki Hayashi](https://github.com/kan-bayashi), who discussed with us much about Melgan, Multi-band melgan, Fastspeech, and Tacotron. This framework based-on his great open-source [ParallelWaveGan](https://github.com/kan-bayashi/ParallelWaveGAN) project.

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