class_docstr: FCOS ARSL network, see https://arxiv.org/abs/
  
  Args:
      backbone (object): backbone instance
      neck (object): 'FPN' instance
      fcos_head (object): 'FCOSHead_ARSL' instance
      fcos_cr_loss (object): 'FCOSLossCR' instance, only used for semi-det(ssod) by ARSL
code: def __init__(
      self,
      backbone,
      neck,
      fcos_head="FCOSHead_ARSL",
      fcos_cr_loss="FCOSLossCR",
  ):
      super(ARSL_FCOS, self).__init__()
      self.backbone = backbone
      self.neck = neck
      self.fcos_head = fcos_head
      self.fcos_cr_loss = fcos_cr_loss
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import paddle
  from ppdet.core.workspace import register, create
  from .meta_arch import BaseArch
label_desc: Use image node_id 1 to create a new ARSL_FCOS object from inherited base classes: BaseArch with example: obj = ARSL_FCOS(backbone, neck, fcos_head, fcos_cr_loss)