WaveRNN-Pytorch

This repository contains Fatcord's Alternative WaveRNN (Faster training), which contains a fast-training, small GPU memory implementation of WaveRNN vocoder.

Model Pruning and Real Time CPU Inference

See geneing's awesome fork that has model pruning, export to C++ and real time inference on CPU: https://github.com/geneing/WaveRNN-Pytorch.

Highlights

• support raw audio wav modelling (via a single Beta Distribution)
• relatively fast synthesis speed without much optimization yet (around 2000 samples/sec on GTX 1060 Ti, 16 GB ram, i5 processor)
• support Fatcord's original quantized (9-bit) wav modelling

Audio Samples

1. Obama & Bernie Sanders See this repo in action!

2. 10-bit audio on held-out testing data from LJSpeech. This model sounds and trains pretty close to 9 bit. We want the higher bit the better.

3. 9-bit audio on held-out testing data from LJSpeech. This model trains the fastest (this is around 130 epochs)

4. Single beta distribution on held-out testing data from LjSpeech. This is trained with the single Beta distribution.

Pretrained Checkpoints

1. Single Beta Distribution trained for 112k. Make sure to change hparams.input_type to raw.
2. 9-bit quantized audio trained for 11k, or around 130 epochs, can be trained further. Make sure to change hparams.input_type to bits.
3. 10-bit quantized audio. To ensure your model is built properly, download the hparams.py here, either replace this with your local hparams.py file or note and update any changes.

Requirements

• Python 3
• CUDA >=8.0
• PyTorch >= v0.4.1

Installation

Ensure above requirements are met.

git clone https://github.com/G-Wang/WaveRNN-Pytorch.git
cd WaveRNN-Pytorch
pip install -r requirements.txt

Usage

1. Adjusting Hyperparameters

Before running scripts, one can adjust hyperparameters in hparams.py.

Some hyperparameters that you might want to adjust:

• fix_learning_rate The model is robust enough to learn well with a fix learning rate of 1e-4, I suggest you try this setting for fastest training, you can decrease this down to 5e-6 for final step refinement. Set this to None to train with learning rate schedule instead
• input_type (best performing ones are currently bits and raw, see hparams.py for more details)
• batch_size
• save_every_step (checkpoint saving frequency)
• evaluate_every_step (evaluation frequency)
• seq_len_factor (sequence length of training audio, the longer the more GPU it takes)

2. Preprocessing

This function processes raw wav files into corresponding mel-spectrogram and wav files according to the audio processing hyperparameters.

Example usage:

python preprocess.py /path/to/my/wav/files

This will process all the .wav files in the folder /path/to/my/wav/files and save them in the default local directory called data_dir.

Can include --output_dir to specify a specific directory to store the processed outputs.

3. Training

Start training process. checkpoints are by default stored in the local directory checkpoints. The script will automatically save a checkpoint when terminated by crtl + c.

Example 1: starting a new model for training

python train.py data_dir

data_dir is the directory containing the processed files.

Example 2: Restoring training from checkpoint

python train.py data_dir --checkpoint=checkpoints/checkpoint0010000.pth

Evaluation .wav files and plots are saved in checkpoints/eval.

WIP

• optimize learning rate schedule
• optimize training hyperparameters (seq_len and batch_size)
• batch generation for synthesis speedup
• model pruning