define transfer variables in new Alg

[patricxu]

Version: 1.9.0

I have developped a new HomoGraph plugin similar to HomoNN(the demo in FATE). but it always stucked when try to get the loss and other variables from the remote client/host. It looks like some error in transfer-variables.

According to the Development Guide of 1.9.0, we should define a transfer variable object of this module in federateml/transfer_variable/transfer_class. But when I search through the folder, I didn't find anything like Homo_nn_transfer.py for HomoNN. So my question is. How does HomoNN transfer varibles without the file and where to register the new transfer-variables for new algorithms?

Besides, in older verion, FATE 1.6.0 for example, there is a homo_nn.json in federateml/transer_variable/auth_conf/ which specifies the actural transer-variables for HomoNN. All we have to do is to copy and modify the file for new algorithms similar to HomoNN. But in 1.9.0 there is NO such folder!