code: def from_config(cls, cfg, hidden_dim, nhead, input_shape):
      return {"hidden_dim": hidden_dim, "nhead": nhead}
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import paddle
  import paddle.nn
  import paddle.nn.functional
  from ppdet.core.workspace import register
  import pycocotools.mask
  from ..initializer import linear_init_, constant_
  from ..transformers.utils import inverse_sigmoid
label_desc: Use image node_id 3 for calling the DeformableDETRHead obj's underlying member method code with example usage: obj.from_config(cls, cfg, hidden_dim, nhead, input_shape) and returns: dict