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 get_pred(self):
      fcos_head_outs = self.model_forward()
      scale_factor = self.inputs["scale_factor"]
      bbox_pred, bbox_num = self.fcos_head.post_process(
          fcos_head_outs, scale_factor
      )
      output = {"bbox": bbox_pred, "bbox_num": bbox_num}
      return output
  
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 7 for calling the ARSL_FCOS obj's underlying member method code with example usage: obj.get_pred() and returns: output