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Unofficial Parallel WaveGAN (+ MelGAN & Multi-band MelGAN & HiFi-GAN & StyleMelGAN) with Pytorch

kan-bayashi.github.io/parallelwavegan/

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Parallel WaveGAN implementation with Pytorch

Open In Colab

This repository provides UNOFFICIAL pytorch implementations of the following models:

You can combine these state-of-the-art non-autoregressive models to build your own great vocoder!

Please check our samples in our demo HP.

Source of the figure: https://arxiv.org/pdf/1910.11480.pdf

The goal of this repository is to provide real-time neural vocoder, which is compatible with ESPnet-TTS.
Also, this repository can be combined with NVIDIA/tacotron2-based implementation (See this comment).

You can try the real-time end-to-end text-to-speech demonstration in Google Colab!

  • Real-time demonstration with ESPnet2 Open In Colab
  • Real-time demonstration with ESPnet1 Open In Colab

What's new

Requirements

This repository is tested on Ubuntu 20.04 with a GPU Titan V.

  • Python 3.6+
  • Cuda 10.0+
  • CuDNN 7+
  • NCCL 2+ (for distributed multi-gpu training)
  • libsndfile (you can install via sudo apt install libsndfile-dev in ubuntu)
  • jq (you can install via sudo apt install jq in ubuntu)
  • sox (you can install via sudo apt install sox in ubuntu)

Different cuda version should be working but not explicitly tested.
All of the codes are tested on Pytorch 1.4, 1.5.1, 1.7.1, 1.8.1, 1.9 and 10.2.

Pytorch 1.6 works but there are some issues in cpu mode (See #198).

Setup

You can select the installation method from two alternatives.

A. Use pip

$ git clone https://github.com/kan-bayashi/ParallelWaveGAN.git
$ cd ParallelWaveGAN
$ pip install -e .
# If you want to use distributed training, please install
# apex manually by following https://github.com/NVIDIA/apex
$ ...

Note that your cuda version must be exactly matched with the version used for the pytorch binary to install apex.
To install pytorch compiled with different cuda version, see tools/Makefile.

B. Make virtualenv

$ git clone https://github.com/kan-bayashi/ParallelWaveGAN.git
$ cd ParallelWaveGAN/tools
$ make
# If you want to use distributed training, please run following
# command to install apex.
$ make apex

Note that we specify cuda version used to compile pytorch wheel.
If you want to use different cuda version, please check tools/Makefile to change the pytorch wheel to be installed.

Recipe

This repository provides Kaldi-style recipes, as the same as ESPnet.
Currently, the following recipes are supported.

To run the recipe, please follow the below instruction.

# Let us move on the recipe directory
$ cd egs/ljspeech/voc1

# Run the recipe from scratch
$ ./run.sh

# You can change config via command line
$ ./run.sh --conf <your_customized_yaml_config>

# You can select the stage to start and stop
$ ./run.sh --stage 2 --stop_stage 2

# If you want to specify the gpu
$ CUDA_VISIBLE_DEVICES=1 ./run.sh --stage 2

# If you want to resume training from 10000 steps checkpoint
$ ./run.sh --stage 2 --resume <path>/<to>/checkpoint-10000steps.pkl

See more info about the recipes in this README.

Speed

The decoding speed is RTF = 0.016 with TITAN V, much faster than the real-time.

[decode]: 100%|██████████| 250/250 [00:30<00:00,  8.31it/s, RTF=0.0156]
2019-11-03 09:07:40,480 (decode:127) INFO: finished generation of 250 utterances (RTF = 0.016).

Even on the CPU (Intel(R) Xeon(R) Gold 6154 CPU @ 3.00GHz 16 threads), it can generate less than the real-time.

[decode]: 100%|██████████| 250/250 [22:16<00:00,  5.35s/it, RTF=0.841]
2019-11-06 09:04:56,697 (decode:129) INFO: finished generation of 250 utterances (RTF = 0.734).

If you use MelGAN's generator, the decoding speed will be further faster.

# On CPU (Intel(R) Xeon(R) Gold 6154 CPU @ 3.00GHz 16 threads)
[decode]: 100%|██████████| 250/250 [04:00<00:00,  1.04it/s, RTF=0.0882]
2020-02-08 10:45:14,111 (decode:142) INFO: Finished generation of 250 utterances (RTF = 0.137).

# On GPU (TITAN V)
[decode]: 100%|██████████| 250/250 [00:06<00:00, 36.38it/s, RTF=0.00189]
2020-02-08 05:44:42,231 (decode:142) INFO: Finished generation of 250 utterances (RTF = 0.002).

If you use Multi-band MelGAN's generator, the decoding speed will be much further faster.

# On CPU (Intel(R) Xeon(R) Gold 6154 CPU @ 3.00GHz 16 threads)
[decode]: 100%|██████████| 250/250 [01:47<00:00,  2.95it/s, RTF=0.048]
2020-05-22 15:37:19,771 (decode:151) INFO: Finished generation of 250 utterances (RTF = 0.059).

# On GPU (TITAN V)
[decode]: 100%|██████████| 250/250 [00:05<00:00, 43.67it/s, RTF=0.000928]
2020-05-22 15:35:13,302 (decode:151) INFO: Finished generation of 250 utterances (RTF = 0.001).

If you want to accelerate the inference more, it is worthwhile to try the conversion from pytorch to tensorflow.
The example of the conversion is available in the notebook (Provided by @dathudeptrai).

Results

Here the results are summarized in the table.
You can listen to the samples and download pretrained models from the link to our google drive.

Model Conf Lang Fs [Hz] Mel range [Hz] FFT / Hop / Win [pt] # iters
ljspeech_parallel_wavegan.v1 link EN 22.05k 80-7600 1024 / 256 / None 400k
ljspeech_parallel_wavegan.v1.long link EN 22.05k 80-7600 1024 / 256 / None 1M
ljspeech_parallel_wavegan.v1.no_limit link EN 22.05k None 1024 / 256 / None 400k
ljspeech_parallel_wavegan.v3 link EN 22.05k 80-7600 1024 / 256 / None 3M
ljspeech_melgan.v1 link EN 22.05k 80-7600 1024 / 256 / None 400k
ljspeech_melgan.v1.long link EN 22.05k 80-7600 1024 / 256 / None 1M
ljspeech_melgan_large.v1 link EN 22.05k 80-7600 1024 / 256 / None 400k
ljspeech_melgan_large.v1.long link EN 22.05k 80-7600 1024 / 256 / None 1M
ljspeech_melgan.v3 link EN 22.05k 80-7600 1024 / 256 / None 2M
ljspeech_melgan.v3.long link EN 22.05k 80-7600 1024 / 256 / None 4M
ljspeech_full_band_melgan.v1 link EN 22.05k 80-7600 1024 / 256 / None 1M
ljspeech_full_band_melgan.v2 link EN 22.05k 80-7600 1024 / 256 / None 1M
ljspeech_multi_band_melgan.v1 link EN 22.05k 80-7600 1024 / 256 / None 1M
ljspeech_multi_band_melgan.v2 link EN 22.05k 80-7600 1024 / 256 / None 1M
ljspeech_hifigan.v1 link EN 22.05k 80-7600 1024 / 256 / None 2.5M
ljspeech_style_melgan.v1 link EN 22.05k 80-7600 1024 / 256 / None 1.5M
jsut_parallel_wavegan.v1 link JP 24k 80-7600 2048 / 300 / 1200 400k
jsut_multi_band_melgan.v2 link JP 24k 80-7600 2048 / 300 / 1200 1M
just_hifigan.v1 link JP 24k 80-7600 2048 / 300 / 1200 2.5M
just_style_melgan.v1 link JP 24k 80-7600 2048 / 300 / 1200 1.5M
csmsc_parallel_wavegan.v1 link ZH 24k 80-7600 2048 / 300 / 1200 400k
csmsc_multi_band_melgan.v2 link ZH 24k 80-7600 2048 / 300 / 1200 1M
csmsc_hifigan.v1 link ZH 24k 80-7600 2048 / 300 / 1200 2.5M
csmsc_style_melgan.v1 link ZH 24k 80-7600 2048 / 300 / 1200 1.5M
arctic_slt_parallel_wavegan.v1 link EN 16k 80-7600 1024 / 256 / None 400k
jnas_parallel_wavegan.v1 link JP 16k 80-7600 1024 / 256 / None 400k
vctk_parallel_wavegan.v1 link EN 24k 80-7600 2048 / 300 / 1200 400k
vctk_parallel_wavegan.v1.long link EN 24k 80-7600 2048 / 300 / 1200 1M
vctk_multi_band_melgan.v2 link EN 24k 80-7600 2048 / 300 / 1200 1M
vctk_hifigan.v1 link EN 24k 80-7600 2048 / 300 / 1200 2.5M
vctk_style_melgan.v1 link EN 24k 80-7600 2048 / 300 / 1200 1.5M
libritts_parallel_wavegan.v1 link EN 24k 80-7600 2048 / 300 / 1200 400k
libritts_parallel_wavegan.v1.long link EN 24k 80-7600 2048 / 300 / 1200 1M
libritts_multi_band_melgan.v2 link EN 24k 80-7600 2048 / 300 / 1200 1M
libritts_hifigan.v1 link EN 24k 80-7600 2048 / 300 / 1200 2.5M
libritts_style_melgan.v1 link EN 24k 80-7600 2048 / 300 / 1200 1.5M
kss_parallel_wavegan.v1 link KO 24k 80-7600 2048 / 300 / 1200 400k
hui_acg_hokuspokus_parallel_wavegan.v1 link DE 24k 80-7600 2048 / 300 / 1200 400k
ruslan_parallel_wavegan.v1 link RU 24k 80-7600 2048 / 300 / 1200 400k
oniku_hifigan.v1 link JP 24k 80-7600 2048 / 300 / 1200 300k
Please access at our google drive to check more results.

How-to-use pretrained models

Analysis-synthesis

Here the minimal code is shown to perform analysis-synthesis using the pretrained model.

# Please make sure you installed `parallel_wavegan`
# If not, please install via pip
$ pip install parallel_wavegan

# You can download the pretrained model from terminal
$ python << EOF
from parallel_wavegan.utils import download_pretrained_model
download_pretrained_model("<pretrained_model_tag>", "pretrained_model")
EOF

# You can get all of available pretrained models as follows:
$ python << EOF
from parallel_wavegan.utils import PRETRAINED_MODEL_LIST
print(PRETRAINED_MODEL_LIST.keys())
EOF

# Now you can find downloaded pretrained model in `pretrained_model/<pretrain_model_tag>/`
$ ls pretrain_model/<pretrain_model_tag>
  checkpoint-400000steps.pkl    config.yml    stats.h5

# These files can also be downloaded manually from the above results

# Please put an audio file in `sample` directory to perform analysis-synthesis
$ ls sample/
  sample.wav

# Then perform feature extraction -> feature normalization -> synthesis
$ parallel-wavegan-preprocess \
    --config pretrain_model/<pretrain_model_tag>/config.yml \
    --rootdir sample \
    --dumpdir dump/sample/raw
100%|████████████████████████████████████████| 1/1 [00:00<00:00, 914.19it/s]
$ parallel-wavegan-normalize \
    --config pretrain_model/<pretrain_model_tag>/config.yml \
    --rootdir dump/sample/raw \
    --dumpdir dump/sample/norm \
    --stats pretrain_model/<pretrain_model_tag>/stats.h5
2019-11-13 13:44:29,574 (normalize:87) INFO: the number of files = 1.
100%|████████████████████████████████████████| 1/1 [00:00<00:00, 513.13it/s]
$ parallel-wavegan-decode \
    --checkpoint pretrain_model/<pretrain_model_tag>/checkpoint-400000steps.pkl \
    --dumpdir dump/sample/norm \
    --outdir sample
2019-11-13 13:44:31,229 (decode:91) INFO: the number of features to be decoded = 1.
[decode]: 100%|███████████████████| 1/1 [00:00<00:00, 18.33it/s, RTF=0.0146]
2019-11-13 13:44:37,132 (decode:129) INFO: finished generation of 1 utterances (RTF = 0.015).

# You can skip normalization step (on-the-fly normalization, feature extraction -> synthesis)
$ parallel-wavegan-preprocess \
    --config pretrain_model/<pretrain_model_tag>/config.yml \
    --rootdir sample \
    --dumpdir dump/sample/raw
100%|████████████████████████████████████████| 1/1 [00:00<00:00, 914.19it/s]
$ parallel-wavegan-decode \
    --checkpoint pretrain_model/<pretrain_model_tag>/checkpoint-400000steps.pkl \
    --dumpdir dump/sample/raw \
    --normalize-before \
    --outdir sample
2019-11-13 13:44:31,229 (decode:91) INFO: the number of features to be decoded = 1.
[decode]: 100%|███████████████████| 1/1 [00:00<00:00, 18.33it/s, RTF=0.0146]
2019-11-13 13:44:37,132 (decode:129) INFO: finished generation of 1 utterances (RTF = 0.015).

# you can find the generated speech in `sample` directory
$ ls sample
  sample.wav    sample_gen.wav

Decoding with ESPnet-TTS model's features

Here, I show the procedure to generate waveforms with features generated by ESPnet-TTS models.

# Make sure you already finished running the recipe of ESPnet-TTS.
# You must use the same feature settings for both Text2Mel and Mel2Wav models.
# Let us move on "ESPnet" recipe directory
$ cd /path/to/espnet/egs/<recipe_name>/tts1
$ pwd
/path/to/espnet/egs/<recipe_name>/tts1

# If you use ESPnet2, move on `egs2/`
$ cd /path/to/espnet/egs2/<recipe_name>/tts1
$ pwd
/path/to/espnet/egs2/<recipe_name>/tts1

# Please install this repository in ESPnet conda (or virtualenv) environment
$ . ./path.sh && pip install -U parallel_wavegan

# You can download the pretrained model from terminal
$ python << EOF
from parallel_wavegan.utils import download_pretrained_model
download_pretrained_model("<pretrained_model_tag>", "pretrained_model")
EOF

# You can get all of available pretrained models as follows:
$ python << EOF
from parallel_wavegan.utils import PRETRAINED_MODEL_LIST
print(PRETRAINED_MODEL_LIST.keys())
EOF

# You can find downloaded pretrained model in `pretrained_model/<pretrain_model_tag>/`
$ ls pretrain_model/<pretrain_model_tag>
  checkpoint-400000steps.pkl    config.yml    stats.h5

# These files can also be downloaded manually from the above results

Case 1: If you use the same dataset for both Text2Mel and Mel2Wav

# In this case, you can directly use generated features for decoding.
# Please specify `feats.scp` path for `--feats-scp`, which is located in
# exp/<your_model_dir>/outputs_*_decode/<set_name>/feats.scp.
# Note that do not use outputs_*decode_denorm/<set_name>/feats.scp since
# it is de-normalized features (the input for PWG is normalized features).
$ parallel-wavegan-decode \
    --checkpoint pretrain_model/<pretrain_model_tag>/checkpoint-400000steps.pkl \
    --feats-scp exp/<your_model_dir>/outputs_*_decode/<set_name>/feats.scp \
    --outdir <path_to_outdir>

# In the case of ESPnet2, the generated feature can be found in
# exp/<your_model_dir>/decode_*/<set_name>/norm/feats.scp.
$ parallel-wavegan-decode \
    --checkpoint pretrain_model/<pretrain_model_tag>/checkpoint-400000steps.pkl \
    --feats-scp exp/<your_model_dir>/decode_*/<set_name>/norm/feats.scp \
    --outdir <path_to_outdir>

# You can find the generated waveforms in <path_to_outdir>/.
$ ls <path_to_outdir>
  utt_id_1_gen.wav    utt_id_2_gen.wav  ...    utt_id_N_gen.wav

Case 2: If you use different datasets for Text2Mel and Mel2Wav models

# In this case, you must provide `--normalize-before` option additionally.
# And use `feats.scp` of de-normalized generated features.

# ESPnet1 case
$ parallel-wavegan-decode \
    --checkpoint pretrain_model/<pretrain_model_tag>/checkpoint-400000steps.pkl \
    --feats-scp exp/<your_model_dir>/outputs_*_decode_denorm/<set_name>/feats.scp \
    --outdir <path_to_outdir> \
    --normalize-before

# ESPnet2 case
$ parallel-wavegan-decode \
    --checkpoint pretrain_model/<pretrain_model_tag>/checkpoint-400000steps.pkl \
    --feats-scp exp/<your_model_dir>/decode_*/<set_name>/denorm/feats.scp \
    --outdir <path_to_outdir> \
    --normalize-before

# You can find the generated waveforms in <path_to_outdir>/.
$ ls <path_to_outdir>
  utt_id_1_gen.wav    utt_id_2_gen.wav  ...    utt_id_N_gen.wav

If you want to combine these models in python, you can try the real-time demonstration in Google Colab!

  • Real-time demonstration with ESPnet2 Open In Colab
  • Real-time demonstration with ESPnet1 Open In Colab

Decoding with dumped npy files

Sometimes we want to decode with dumped npy files, which are mel-spectrogram generated by TTS models. Please make sure you used the same feature extraction settings of the pretrained vocoder (fs, fft_size, hop_size, win_length, fmin, and fmax).
Only the difference of log_base can be changed with some post-processings (we use log 10 instead of natural log as a default). See detail in the comment.

# Generate dummy npy file of mel-spectrogram
$ ipython
[ins] In [1]: import numpy as np
[ins] In [2]: x = np.random.randn(512, 80)  # (#frames, #mels)
[ins] In [3]: np.save("dummy_1.npy", x)
[ins] In [4]: y = np.random.randn(256, 80)  # (#frames, #mels)
[ins] In [5]: np.save("dummy_2.npy", y)
[ins] In [6]: exit

# Make scp file (key-path format)
$ find -name "*.npy" | awk '{print "dummy_" NR " " $1}' > feats.scp

# Check (<utt_id> <path>)
$ cat feats.scp
dummy_1 ./dummy_1.npy
dummy_2 ./dummy_2.npy

# Decode without feature normalization
# This case assumes that the input mel-spectrogram is normalized with the same statistics of the pretrained model.
$ parallel-wavegan-decode \
    --checkpoint /path/to/checkpoint-400000steps.pkl \
    --feats-scp ./feats.scp \
    --outdir wav
2021-08-10 09:13:07,624 (decode:140) INFO: The number of features to be decoded = 2.
[decode]: 100%|████████████████████████████████████████| 2/2 [00:00<00:00, 13.84it/s, RTF=0.00264]
2021-08-10 09:13:29,660 (decode:174) INFO: Finished generation of 2 utterances (RTF = 0.005).

# Decode with feature normalization
# This case assumes that the input mel-spectrogram is not normalized.
$ parallel-wavegan-decode \
    --checkpoint /path/to/checkpoint-400000steps.pkl \
    --feats-scp ./feats.scp \
    --normalize-before \
    --outdir wav
2021-08-10 09:13:07,624 (decode:140) INFO: The number of features to be decoded = 2.
[decode]: 100%|████████████████████████████████████████| 2/2 [00:00<00:00, 13.84it/s, RTF=0.00264]
2021-08-10 09:13:29,660 (decode:174) INFO: Finished generation of 2 utterances (RTF = 0.005).

Notes

The terms of use of the pretrained model follow that of each corpus used for the training. Please carefully check by yourself.

References

Acknowledgement

The author would like to thank Ryuichi Yamamoto (@r9y9) for his great repository, paper, and valuable discussions.

Author

Tomoki Hayashi (@kan-bayashi)
E-mail: hayashi.tomoki<at>g.sp.m.is.nagoya-u.ac.jp

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Unofficial Parallel WaveGAN (+ MelGAN & Multi-band MelGAN & HiFi-GAN & StyleMelGAN) with Pytorch

kan-bayashi.github.io/ParallelWaveGAN/

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