Also, most recent state of progress: Predictive Coding Can Do Exact Backpropagation on Any Neural Network (2021) https://arxiv.org/abs/2103.04689 https://arxiv

Also, most recent state of progress: Predictive Coding Can Do Exact Backpropagation on Any Neural Network (2021) https://arxiv.org/abs/2103.04689 https://arxiv.org/abs/2103.04689