content: from .resnet_fpn import ResNetFPN_8_2, ResNetFPN_16_4
  
  
  def build_backbone(config):
      if config['backbone_type'] == 'ResNetFPN':
          if config['resolution'] == (8, 2):
              return ResNetFPN_8_2(config['resnetfpn'])
          elif config['resolution'] == (16, 4):
              return ResNetFPN_16_4(config['resnetfpn'])
      else:
          raise ValueError(f"LOFTR.BACKBONE_TYPE {config['backbone_type']} not supported.")
  