code: def __init__(self, num_classes=91, **kwargs):
      backbone = resnet_fpn_backbone("resnet50", True)
      super(FRCNNObjectDetector, self).__init__(
          backbone, num_classes, **kwargs
      )
  
imports: from torchvision.models.detection.faster_rcnn import FasterRCNN
  from torchvision.models.detection.backbone_utils import resnet_fpn_backbone
label_desc: Use image node_id 1 to create a new FRCNNObjectDetector object from inherited base classes: FasterRCNN with example: obj = FRCNNObjectDetector(num_classes)