MelGAN

Unofficial PyTorch implementation of MelGAN vocoder

Key Features

• MelGAN is lighter, faster, and better at generalizing to unseen speakers than WaveGlow.
• This repository use identical mel-spectrogram function from NVIDIA/tacotron2, so this can be directly used to convert output from NVIDIA's tacotron2 into raw-audio.
• Pretrained model on LJSpeech-1.1 via PyTorch Hub.

Prerequisites

Tested on Python 3.6

pip install -r requirements.txt

Prepare Dataset

• Download dataset for training. This can be any wav files with sample rate 22050Hz. (e.g. LJSpeech was used in paper)
• preprocess: python preprocess.py -c config/default.yaml -d [data's root path]
• Edit configuration yaml file

Train & Tensorboard

• python trainer.py -c [config yaml file] -n [name of the run]
  • cp config/default.yaml config/config.yaml and then edit config.yaml
  • Write down the root path of train/validation files to 2nd/3rd line.
  • Each path should contain pairs of *.wav with corresponding (preprocessed) *.mel file.
  • The data loader parses list of files within the path recursively.
• tensorboard --logdir logs/

Pretrained model

Try with Google Colab: TODO

import torch
vocoder = torch.hub.load('seungwonpark/melgan', 'melgan')
vocoder.eval()
mel = torch.randn(1, 80, 234) # use your own mel-spectrogram here

if torch.cuda.is_available():
    vocoder = vocoder.cuda()
    mel = mel.cuda()

with torch.no_grad():
    audio = vocoder.inference(mel)

Inference

• python inference.py -p [checkpoint path] -i [input mel path]

Results

See audio samples at: http://swpark.me/melgan/. Model was trained at V100 GPU for 14 days using LJSpeech-1.1.

Implementation Authors

• Seungwon Park @ MINDsLab Inc. (yyyyy@snu.ac.kr, swpark@mindslab.ai)
• Myunchul Joe @ MINDsLab Inc.
• Rishikesh @ DeepSync Technologies Pvt Ltd.

License

BSD 3-Clause License.

• utils/stft.py by Prem Seetharaman (BSD 3-Clause License)
• datasets/mel2samp.py from https://github.com/NVIDIA/waveglow (BSD 3-Clause License)
• utils/hparams.py from https://github.com/HarryVolek/PyTorch_Speaker_Verification (No License specified)

Useful resources

• How to Train a GAN? Tips and tricks to make GANs work by Soumith Chintala
• Official MelGAN implementation by original authors
• Reproduction of MelGAN - NeurIPS 2019 Reproducibility Challenge (Ablation Track) by Yifei Zhao, Yichao Yang, and Yang Gao
  • "replacing the average pooling layer with max pooling layer and replacing reflection padding with replication padding improves the performance significantly, while combining them produces worse results"