Questions in transvcl_model.py

[yueyue1009]

Thanks for your excellent work! I'm now working on training TransVCL from scratch. But I found that some code in the forward function is unable to use directly, such as self.sum_index is not defined, parameter targets seems to have wrong type.
It will be nice if you can release new updates that solves these issues, or full script of training code would be even better.