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Lau, Kin Wai; Rehman, Yasar Abbas Ur; Po, Lai-Man
Neurocomputing (Amsterdam), 04/2024, Volume: 578Journal Article
Recent research has successfully adapted vision-based convolutional neural network (CNN) architectures for audio recognition tasks using Mel-Spectrograms. However, these CNNs have high computational costs and memory requirements, limiting their deployment on low-end edge devices. Motivated by the success of efficient vision models like InceptionNeXt and ConvNeXt, we propose AudioRepInceptionNeXt, a single-stream architecture. Its basic building block breaks down the parallel multi-branch depth-wise convolutions with descending scales of k×k kernels into a cascade of two multi-branch depth-wise convolutions. The first multi-branch consists of parallel multi-scale 1×k depth-wise convolutional layers followed by a similar multi-branch employing parallel multi-scale k×1 depth-wise convolutional layers. This reduces computational and memory footprint while separating time and frequency processing of Mel-Spectrograms. The large kernels capture global frequencies and long activities, while small kernels get local frequencies and short activities. We also reparameterize the multi-branch design during inference to further boost speed without losing accuracy. Experiments show that AudioRepInceptionNeXt reduces parameters and computations by 50%+ and improves inference speed 1.28× over state-of-the-art CNNs like the Slow–Fast while maintaining comparable accuracy. It also learns robustly across a variety of audio recognition tasks.
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