This is a PyTorch implementation of our work "FloWaveNet : A Generative Flow for Raw Audio".

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 http://bit.ly/2zpsElV. Also, our implementation of ClariNet (Gaussian WaveNet and Gaussian IAF) is available at https://github.com/ksw0306/ClariNet

• PyTorch 0.4.1
• Python 3.6
• Librosa

• LJSpeech : https://keithito.com/LJ-Speech-Dataset/

python preprocessing.py --in_dir ljspeech --out_dir DATASETS/ljspeech

python train.py --model_name flowavenet --batch_size 8 --n_block 8 --n_flow 6 --n_layer 2 --causal no

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

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

ex) python synthesize.py --model_name flowavenet --n_block 8 --n_flow 6 --n_layer 2 --causal no --load_step 100000 --temp 0.7 --num_samples 10

Sample Link : http://bit.ly/2zpsElV

Our implementation of ClariNet (Gaussian WaveNet, Gaussian IAF) : https://github.com/ksw0306/ClariNet

• 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 : Gaussian IAF and FloWaveNet)

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

• Results 4 : Context Block and Long term Dependency (FloWaveNet : 8 Context Blocks, FloWaveNet_small : 6 Context Blocks)

• Results 5 : Causality of WaveNet Dilated Convolutions (FloWaveNet : Non-causal WaveNet Affine Coupling Layers, FloWaveNet_causal : Causal WaveNet Affine Coupling Layers)

• WaveNet vocoder : https://github.com/r9y9/wavenet_vocoder
• glow-pytorch : https://github.com/rosinality/glow-pytorch