code: def with_pos_embed(self, tensor, pos):
      return tensor if pos is None else tensor + pos
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import math
  import paddle
  import paddle.nn
  import paddle.nn.functional
  from paddle import ParamAttr
  from ppdet.core.workspace import register
  from ..layers import MultiHeadAttention
  from .position_encoding import PositionEmbedding
  from .utils import _get_clones, get_valid_ratio
  from ..initializer import linear_init_, constant_, xavier_uniform_, normal_
label_desc: Use image node_id 3 for calling the DeformableTransformerDecoderLayer obj's underlying member method code with example usage: obj.with_pos_embed(tensor, pos) and returns: unknown