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A Pytorch implementation of "FloWaveNet: A Generative Flow for Raw Audio"

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FloWaveNet : A Generative Flow for Raw Audio

This is a PyTorch implementation of our work "FloWaveNet : A Generative Flow for Raw Audio". (We'll update soon.)

For a purpose of parallel sampling, we propose FloWaveNet, a flow-based generative model for raw audio synthesis. FloWaveNet can generate audio samples as fast as ClariNet and Parallel WaveNet, while the training procedure is really easy and stable with a single-stage pipeline. Our generated audio samples are available at Also, our implementation of ClariNet (Gaussian WaveNet and Gaussian IAF) is available at


  • PyTorch 0.4.1
  • Python 3.6
  • Librosa


Step 1. Download Dataset

Step 2. Preprocessing (Preparing Mel Spectrogram)

python --in_dir ljspeech --out_dir DATASETS/ljspeech

Step 3. Train

Single-GPU training

python --model_name flowavenet --batch_size 2 --n_block 8 --n_flow 6 --n_layer 2 --block_per_split 4
Multi-GPU training

python --model_name flowavenet --batch_size 8 --n_block 8 --n_flow 6 --n_layer 2 --block_per_split 4 --num_gpu 4

NVIDIA TITAN V (12GB VRAM) : batch size 2 per GPU

NVIDIA Tesla V100 (32GB VRAM) : batch size 8 per GPU

Step 4. Synthesize

--load_step CHECKPOINT
: the # of the pre-trained model's global training step (also depicted in the trained weight file)

: Temperature (standard deviation) value implemented as z ~ N(0, 1 * TEMPERATURE^2)


python --model_name flowavenet --n_block 8 --n_flow 6 --n_layer 2 --load_step 100000 --temp 0.8 --num_samples 10 --block_per_split 4

Sample Link

Sample Link :

Our implementation of ClariNet (Gaussian WaveNet, Gaussian IAF) :

  • Results 1 : Model Comparisons (WaveNet (MoL, Gaussian), ClariNet and FloWaveNet)

  • Results 2 : Temperature effect on Audio Quality Trade-off (Temperature T : 0.0 ~ 1.0, Model : FloWaveNet)

  • Results 3 : Analysis of ClariNet Loss Terms (Loss functions : 1. Only KL 2. KL + Frame 3. Only Frame)

  • Results 4 : Causality of WaveNet Dilated Convolutions (FloWaveNet : Non-causal WaveNet Affine Coupling Layers, FloWaveNet_causal : Causal WaveNet Affine Coupling Layers)


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