referees correctly identified the main contributions of this work, namely: 1) a physically-inspired RNN generalising

We are grateful to the anonymous referees for their valuable comments and suggestions. A smoother introduction of equation (2) would be nice. To retain the PGD interpretation of the network, one can use truncated ReLus as activation functions. I believe that the experimental results section could have been larger, with more results to support the claims. The ninth page will comment further on the experimental results.