code: def forward(self, inpt, tgt):
      return torch.mean(torch.abs(_divide_no_nan(tgt - inpt, tgt)))
  
file_path: darts/darts/utils/losses.py
imports: import numpy
  import torch
  import torch.nn
label_desc: Use image node_id 2 for calling the MapeLoss obj's underlying member method code with example usage: obj.forward(inpt, tgt) and returns: torch