code: def __init__(self, *args, **kwargs) -> None:
      super().__init__(*args, **kwargs)
      self.loss_fn = nn.L1Loss()
  
file_path: gluonts/src/gluonts/nursery/robust-mts-attack/pts/model/lstnet/lstnet_network.py
imports: from typing import List, Tuple, Optional
  import numpy
  import torch
  import torch.nn
  import torch.nn.functional
  from pts.modules import MeanScaler, NOPScaler
label_desc: Use image node_id 1 to create a new LSTNetTrain object from inherited base classes: LSTNetBase with example: obj = LSTNetTrain()