code: def exp_rmspe(pred:Tensor, targ:Tensor)->Rank0Tensor:
      "Exp RMSE between `pred` and `targ`."
      pred,targ = flatten_check(pred,targ)
      pred, targ = torch.exp(pred), torch.exp(targ)
      pct_var = (targ - pred)/targ
      return torch.sqrt((pct_var**2).mean()f exp_rmspe(pred:Tensor, targ:Tensor)->Rank0Tensor:
      "Exp RMSE between `pred` and `targ`."
      pred,targ = flatten_check(pred,targ)
      pred, targ = torch.exp(pred), torch.exp(targ)
      pct_var = (targ - pred)/targ
      return torch.sqrt((pct_var**2).mean())
docs: Exp RMSE between `pred` and `targ`.