nnAudio

nnAudio is a GPU-accelerated audio processing toolbox built on PyTorch's 1D convolutional neural networks. It specializes in generating various spectrograms (STFT, Mel, CQT) on-the-fly during deep learning training, allowing for differentiable and trainable Fourier kernels. This approach significantly speeds up spectrogram computation compared to traditional CPU-based libraries. The library is currently at version 0.3.4 and follows an active, milestone-driven release cadence.