# Deep Voice 3 with Paddle Fluid

[中文版](README_cn.md)

Paddle fluid implementation of DeepVoice 3, a convolutional network based text-to-speech synthesis model. The implementation is based on [Deep Voice 3: Scaling Text-to-Speech with Convolutional Sequence Learning](https://arxiv.org/abs/1710.07654).

We implement Deepvoice3 model in paddle fluid with dynamic graph, which is convenient for flexible network architectures.

## Installation

### Install paddlepaddle

This implementation requires paddlepaddle 1.6. You can either download the compiled package or build paddle from source.

1. Install the compiled package, via pip, conda or docker. See [**Installation Mannuals**](https://www.paddlepaddle.org.cn/documentation/docs/en/beginners_guide/install/index_en.html) for more details.

2. Build paddlepaddle from source. See [**Compile From Source Code**](https://www.paddlepaddle.org.cn/documentation/docs/en/beginners_guide/install/compile/fromsource_en.html) for more details. Note that if you want to enable data parallel training for multiple GPUs, you should set `-DWITH_DISTRIBUTE=ON` with cmake.

### Other Requirements

Install other requirements with pip.


```bash
pip install -r requirements.txt
```

You also need to download punkt and cmudict for nltk, because we tokenize text with `punkt` and convert text into phonemes with `cmudict`.

```python
import nltk
nltk.download("punkt")
nltk.download("cmudict")
```

## Model Architecture

![DeepVoice3 model architecture](./_images/model_architecture.png)

The model consists of an encoder, a decoder and a converter (and a speaker embedding for multispeaker models). The encoder, together with the decoder forms the seq2seq part of the model, and the converter forms the postnet part.

## Project Structure

```text
├── audio.py                        # audio processing
├── compute_timestamp_ratio.py      # script to compute position rate
├── conversion                      # parameter conversion from pytorch model
├── requirements.txt                # requirements
├── hparams.py                      # HParam class for deepvoice3
├── hparam_tf                       # hyper parameter related stuffs
├── ljspeech.py                     # functions for ljspeech preprocessing
├── preprocess.py                   # preprocrssing script
├── presets                         # preset hyperparameters
├── deepvoice3_paddle               # DeepVoice3 model implementation
├── eval_model.py                   # functions for model evaluation
├── synthesis.py                    # script for speech synthesis
├── train_model.py                  # functions for model training
└── train.py                        # script for model training
```

## Usage

There are many hyperparameters to be tuned depending on the specification of model and dataset you are working on. Hyperparameters that are known to work good are provided in the repository. See `presets` directory for details. Now we only provide preset with LJSpeech dataset (`deepvoice3_ljspeech.json`). Support for more models and datasets is pending.

Note that `preprocess.py`, `train.py` and `synthesis.py` all accept a `--preset` parameter. To ensure consistency, you should use the same preset for preprocessing, training and synthesizing.

Note that you can overwrite preset hyperparameters with command line argument `--hparams`, just pass several key-value pair in  `${key}=${value}` format seperated by comma （`,`）. For example `--hparams="batch_size=8, nepochs=500"` can overwrite default values in the preset json file.

Some hyperparameters are only related to training, like `batch_size`, `checkpoint_interval` and you can use different values for preprocessing and training. But hyperparameters related to data preprocessing, like `num_mels` and `ref_level_db`, should be kept the same for preprocessing and training.

For more details about hyperparameters, see `hparams.py`, which contains the definition of `hparams`. Priority order of hyperparameters is command line option `--hparams` > `--preset` json configuration file > definition of hparams in `hparams.py`.

### Dataset

Download and unzip [LJSpeech](https://keithito.com/LJ-Speech-Dataset/).

```bash
wget https://data.keithito.com/data/speech/LJSpeech-1.1.tar.bz2
tar xjvf LJSpeech-1.1.tar.bz2
```

Preprocessing with `preprocess.py`.

```bash
python preprocess.py \
    --preset=${preset_json_path} \
    --hparams="hyper parameters you want to overwrite" \
    ${name} ${in_dir} ${out_dir}
```

Now `${name}$` only supports `ljspeech`. Support for other datasets is pending.

Assuming that you use `presers/deepvoice3_ljspeech.json` for LJSpeech and the path of the unziped dataset is `./data/LJSpeech-1.1`, then you can preprocess data with the following command.

```bash
python preprocess.py \
    --preset=presets/deepvoice3_ljspeech.json \
    ljspeech ./data/LJSpeech-1.1/ ./data/ljspeech
```

When this is done, you will see extracted features in `./data/ljspeech` including:

1. text and corresponding file names for the extracted features in `train.txt`.
2. mel-spectrogram in `ljspeech-mel-*.npy` .
3. linear-spectrogram in `ljspeech-spec-*.npy`.

### Train on single GPU

Training the whole model on one single GPU:

```bash
export CUDA_VISIBLE_DEVICES=0
python train.py --data-root=${data-root} --use-gpu \
    --preset=${preset_json_path} \
    --hparams="parameters you may want to override"
```

For more details about `train.py`, see `python train.py --help`.

#### load checkpoints

You can load saved checkpoint and resume training with `--checkpoint`, if you wan to reset optimizer states, pass `--reset-optimizer` in addition.

#### train a part of the model

You can also train parts of the model while freezing other parts, by passing `--train-seq2seq-only` or `--train-postnet-only`. When training only parts of the model, other parts should be loaded from saved checkpoint.

To train only the `seq2seq` or `postnet`, you should load from a whole model  with `--checkpoint` and keep the same configurations with which the checkpoint is trained. Note that when training only the `postnet`, you should set `use_decoder_state_for_postnet_input=false`, because when train only the postnet, the postnet takes the ground truth mel-spectrogram as input. Note that the default value for `use_decoder_state_for_postnet_input` is `True`.

example:

```bash
export CUDA_VISIBLE_DEVICES=0
python train.py --data-root=${data-root} --use-gpu \
    --preset=${preset_json_path} \
    --hparams="parameters you may want to override" \
    --train-seq2seq-only \
    --output=${directory_to_save_results}
```

### Training on multiple GPUs

Training on multiple GPUs with data parallel is enabled. You can run `train.py` with `paddle.distributed.launch` module. Here is the command line usage.

```bash
python -m paddle.distributed.launch \
    --started_port ${port_of_the_first_worker} \
    --selected_gpus ${logical_gpu_ids_to_choose} \
    --log_dir ${path_of_write_log} \
    training_script ...
```

`paddle.distributed.launch` parallelizes training in multiprocessing mode.`--selected_gpus` means the logical ids of the selected GPUs, and `started_port` means the port used by the first worker.  Outputs of each process are saved in `--log_dir.` Then follows the command for training on a single GPU, except that you should pass `--use-data-paralle` in addition.

```bash
export CUDA_VISIBLE_DEVICES=2,3,4,5    # The IDs of visible physical devices
python -m paddle.distributed.launch \
    --selected_gpus=0,1,2,3 --log_dir ${multi_gpu_log_dir} \
    train.py --data-root=${data-root} \
    --use-gpu --use-data-parallel \
    --preset=${preset_json_path} \
    --hparams="parameters you may want to override"
```

In the example above, we set only GPU `2, 3, 4, 5` to be visible. Then `--selected_gpus="0, 1, 2, 3"` means the logical ids of the selected gpus, which correponds to GPU `2, 3, 4, 5`.

Model checkpoints (`*.pdparams` for the model and `*.pdopt` for the optimizer) are saved in `${directory_to_save_results}/checkpoints` per 10000 steps by default. Layer-wise averaged attention alignments (.png) are saved in `${directory_to_save_results}/checkpoints/alignment_ave`. And alignments for each attention layer are saved in `${directory_to_save_results}/checkpoints/alignment_layer{attention_layer_num}` per 10000 steps for inspection.

Synthesis results of 6 sentences (hardcoded in `eval_model.py`) are saved in `${directory_to_save_results}/checkpoints/eval`, including  `step{step_num}_text{text_id}_single_alignment.png` for averaged alignments and `step{step_num}_text{text_id}_single_predicted.wav` for the predicted waveforms.


### Monitor with Tensorboard

Logs with tensorboard are saved in `${directory_to_save_results}/log/`  directory by default. You can monitor logs by tensorboard.

```bash
tensorboard --logdir=${log_dir} --host=$HOSTNAME --port=8888
```

### Synthesize from a checkpoint

Given a list of text, `synthesis.py` synthesize audio signals from a trained model.

```bash
python synthesis.py --use-gpu --preset=${preset_json_path} \
    --hparams="parameters you may want to override" \
      ${checkpoint} ${text_list_file} ${dst_dir}
```

Example test_list.txt:

```text
Generative adversarial network or variational auto-encoder.
Once upon a time there was a dear little girl who was loved by every one who looked at her, but most of all by her grandmother, and there was nothing that she would not have given to the child.
A text-to-speech synthesis system typically consists of multiple stages, such as a text analysis frontend, an acoustic model and an audio synthesis module.
```

generated waveform files and alignment files are saved in `${dst_dir}`.

### Compute position ratio

According to [Deep Voice 3: Scaling Text-to-Speech with Convolutional Sequence Learning](https://arxiv.org/abs/1710.07654), the position rate is different for different datasets. There are 2 position rates, one for the query and the other for the key, which are referred to as $\omega_1$ and $\omega_2$ in th paper, and the corresponding names in preset json are `query_position_rate` and `key_position_rate`.

For example, the `query_position_rate` and `key_position_rate` for LJSpeech are `1.0` and `1.385`, respectively. Fix the `query_position_rate` as 1.0, the `key_position_rate` is computed with `compute_timestamp_ratio.py`. Run the command below, where `${data_root}` means the path of the preprocessed dataset.

```bash
python compute_timestamp_ratio.py --preset=${preset_json_path} \
    --hparams="parameters you may want to override" ${data_root}
```

You will get outputs like this.

```text
100%|██████████████████████████████████████████████████████████| 13047/13047 [00:12<00:00, 1058.19it/s]
1345587 1863884.0 1.3851828235558161
```

Then set the `key_position_rate=1.385` and `query_position_rate=1.0` in the preset.

## Acknowledgement

We thankfully included and adapted some files from r9y9's [deepvoice3_pytorch](https://github.com/r9y9/deepvoice3_pytorch).
