code: def backward(self, loss):
      scaled_loss = loss * self.loss_scale
      scaled_loss.backward()
  
file_path: DALI/docs/examples/use_cases/video_superres/common/loss_scaler.py
imports: import torch
label_desc: Use image node_id 7 for calling the LossScaler obj's underlying member method code with example usage: obj.backward(loss) without return types