code: def __init__(self, model, num_pframes, loss_functions):
      super().__init__()
      self.model = model.motion_estimator
      self.num_pframes = num_pframes
      self.loss_functions = loss_functions
  
imports: from typing import Callable, NamedTuple, Optional
  import torch
  import torch.nn
  from torch import Tensor
  import neuralcompression.functional
label_desc: Use image node_id 1 to create a new DvcStage1 object from inherited base classes: DvcStage with example: obj = DvcStage1(model, num_pframes, loss_functions)