论文标题

具有带宽限制的通道的神经通信系统

Neural Communication Systems with Bandwidth-limited Channel

论文作者

Ullrich, Karen, Viola, Fabio, Rezende, Danilo Jimenez

论文摘要

尽管由于嘈杂的渠道造成的信息丢失,但可靠地传输消息是信息理论的核心问题。现实世界交流的最重要方面之一,例如通过wifi,它可能在信息传输的不同级别上发生。带宽限制的通道模型这种现象。在这项研究中,我们考虑使用带宽限制的渠道(BWLC)学习编码。最近,已经研究了诸如变异自动编码器之类的神经通信模型,以实现源压缩的任务。我们通过使用BWLC研究神经通信系统来建立这项工作。具体而言,我们发现在预期信息损失下相关的三个建模选择。首先,我们建议共同建模压缩(源编码)和误差校正(通道编码),而不是分开压缩(源编码)和误差校正(通道编码)的子任务。将问题构建为变分学习问题,我们得出的结论是,当通过灵活的可学习函数近似值(例如神经网络)执行编码时,联合系统的表现优于其单独的对应物。为了促进学习,我们引入了带宽限制的通道的可区分和计算高效版本。其次,我们提出了一种设计,将缺少信息与先验建模,并将其纳入频道模型。最后,通过在解码器中引入辅助潜在变量来改善关节模型的采样。实验结果通过改善失真和FID得分来证明我们的设计决策的有效性是合理的。

Reliably transmitting messages despite information loss due to a noisy channel is a core problem of information theory. One of the most important aspects of real world communication, e.g. via wifi, is that it may happen at varying levels of information transfer. The bandwidth-limited channel models this phenomenon. In this study we consider learning coding with the bandwidth-limited channel (BWLC). Recently, neural communication models such as variational autoencoders have been studied for the task of source compression. We build upon this work by studying neural communication systems with the BWLC. Specifically,we find three modelling choices that are relevant under expected information loss. First, instead of separating the sub-tasks of compression (source coding) and error correction (channel coding), we propose to model both jointly. Framing the problem as a variational learning problem, we conclude that joint systems outperform their separate counterparts when coding is performed by flexible learnable function approximators such as neural networks. To facilitate learning, we introduce a differentiable and computationally efficient version of the bandwidth-limited channel. Second, we propose a design to model missing information with a prior, and incorporate this into the channel model. Finally, sampling from the joint model is improved by introducing auxiliary latent variables in the decoder. Experimental results justify the validity of our design decisions through improved distortion and FID scores.

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