class_docstr: FCOSR Head, refer to https://arxiv.org/abs/2111.10780 for details 
class_docstr_tok: ["FCOSR","Head",",","refer","to","https",":","\/\/arxiv.org\/abs\/2111.10780","for","details"]
code: def from_config(cls, cfg, input_shape):
      return {
          "in_channels": [i.channels for i in input_shape],
      }
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  from ppdet.core.workspace import register
  from paddle import ParamAttr
  from paddle.regularizer import L2Decay
  from .fcos_head import ScaleReg
  from ..initializer import bias_init_with_prob, constant_, normal_
  from ..ops import get_act_fn, anchor_generator
  from ..rbox_utils import box2corners
  from ..losses import ProbIoULoss
  import numpy
label_desc: Use image node_id 3 for calling the FCOSRHead obj's underlying member method code with example usage: obj.from_config(cls, cfg, input_shape) and returns: dict