code: def add_gt_proposals(self, proposals, gt_boxes):
      # type: (List[Tensor], List[Tensor]) -> List[Tensor]
      proposals = [
          torch.cat((proposal, gt_box))
          for proposal, gt_box in zip(proposals, gt_boxes)
      ]
  
      return proposals
  
imports: from typing import Dict, List, Optional, Tuple
  import torch
  import torch.nn.functional
  import torchvision
  from torch import nn, Tensor
  from torchvision.ops import boxes, roi_align
  from .None import _utils
label_desc: Use image node_id 6 for calling the RoIHeads obj's underlying member method code with example usage: obj.add_gt_proposals(proposals, gt_boxes) and returns: proposals