error, colon missing, convert the [:,t,:] syntax of python language into C#

[toolgood]

url: https://github.com/yuqinie98/PatchTST/blob/main/PatchTST_supervised/exp/exp_main.py#L142

src code

      dec_inp = torch.zeros_like(batch_y[:, -self.args.pred_len:, :]).float()

csharp code

     dec_inp = torch.zeros_like(batch_y[":",-this.args.pred_len,":"]).@float();