Review for NeurIPS paper: HiFi-GAN: Generative Adversarial Networks for Efficient and High Fidelity Speech Synthesis

Strengths: (1) The paper proposes a new model named HiFi-GAN for efficient and high-fidelity raw waveform generation from mel-spectrogram. In addition to the existing Multi-Scale Discriminator (MSD), the discriminator also consists of a set of small sub-discriminators (called Multi-Period Discriminator, MPD). Each MPD handles a portion of periodic signals of input audio to capture the diverse periodic patterns underlying in the audio data.