code: def from_config(cls, cfg, *args, **kwargs):
      backbone = create(cfg["backbone"])
      kwargs = {"input_shape": backbone.out_shape}
      neck = cfg["neck"] and create(cfg["neck"], **kwargs)
  
      out_shape = neck and neck.out_shape or backbone.out_shape
      kwargs = {"input_shape": out_shape}
      head = create(cfg["head"], **kwargs)
  
      return {"backbone": backbone, "neck": neck, "head": head}
  
file_path: PaddleDetection/ppdet/modeling/architectures/s2anet.py
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 2 for calling the S2ANet obj's underlying member method code with example usage: obj.from_config(cls, cfg) and returns: dict