code: def backward_loss(z, backward_error):
      return t.sum(z * backward_error)
  
imports: import torch
  from typing import List, Literal
  import torch
  from fate.arch import Context
  from torch.nn.modules.module import T
label_desc: Use image node_id 1 for calling a global function with example usage: backward_loss(z, backward_error) and returns: t