2020

WaveGrad: Estimating Gradients for Waveform Generation

Chen, Nanxin, Zhang, Yu, Zen, Heiga et al.

Understand

This paper introduces WaveGrad, a conditional model for waveform generation which estimates gradients of the data density.

  • The model is built on prior work on score matching and diffusion probabilistic models.
  • It starts from a Gaussian white noise signal and iteratively refines the signal via a gradient-based sampler conditioned on the mel-spectrogram.
  • WaveGrad offers a natural way to trade inference speed for sample quality by adjusting the number of refinement steps, and bridges the gap between non-autoregressive and autoregressive models in terms of audio quality.

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