code: def __init__(self, key="loss", reduction="none"):
      super().__init__()
      self.key = key
      self.reduction = reduction
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddle.nn import L1Loss
  from paddle.nn import MSELoss
  from paddle.nn import SmoothL1Loss
label_desc: Use image node_id 1 to create a new LossFromOutput object from inherited base classes: nn with example: obj = LossFromOutput(key, reduction)