code: def __init__(self, backbone, position_embedding):
      super().__init__(backbone, position_embedding)
  
imports: from collections import OrderedDict
  import torch
  import torch.nn.functional
  import torchvision
  from torch import nn
  from torchvision.models._utils import IntermediateLayerGetter
  from typing import Dict, List
  from util.misc import NestedTensor, is_main_process
  from .position_encoding import build_position_encoding
label_desc: Use image node_id 1 to create a new Joiner object from inherited base classes: nn with example: obj = Joiner(backbone, position_embedding)