1 The authors do not analyze the security (i.e., protection of the privacy) of the proposed framework.
2 The authors do not analyze the communication cost between each client (i.e., domain) and the server. In a typical federated learning system, the communication cost is a very important issue.
3 The way of using an encoder and a decoder, or a domain-specific part and a domain-independent part are well known in existing cross-domain or transfer learning works.
1 The authors do not analyze the security (i.e., protection of the privacy) of the proposed framework.