code: def get_rel_pos(self, seq_size, rel_pos):
      max_rel_dist = int(2 * seq_size - 1)
      # Interpolate rel pos if needed.
      if rel_pos.shape[0] != max_rel_dist:
          # Interpolate rel pos.
          rel_pos = rel_pos.reshape([1, rel_pos.shape[0], -1])
          rel_pos = rel_pos.transpose([0, 2, 1])
          rel_pos_resized = F.interpolate(
              rel_pos,
              size=(max_rel_dist,),
              mode="linear",
              data_format="NCW",
          )
          rel_pos_resized = rel_pos_resized.reshape([-1, max_rel_dist])
          rel_pos_resized = rel_pos_resized.transpose([1, 0])
      else:
          rel_pos_resized = rel_pos
  
      coords = paddle.arange(seq_size, dtype="float32")
      relative_coords = coords.unsqueeze(-1) - coords.unsqueeze(0)
      relative_coords += seq_size - 1
      relative_coords = relative_coords.astype("int64").flatten()
  
      return paddle.index_select(
          rel_pos_resized, relative_coords
      ).reshape([seq_size, seq_size, self.head_dim])
  
imports: import paddle
  import paddle.nn
  import paddle.nn.functional
  import numpy
  import math
  from paddle import ParamAttr
  from paddle.regularizer import L2Decay
  from paddle.nn.initializer import Constant, TruncatedNormal
  from ppdet.modeling.shape_spec import ShapeSpec
  from ppdet.core.workspace import register, serializable
  from .transformer_utils import zeros_, DropPath, Identity, window_partition, window_unpartition
  from ..initializer import linear_init_
label_desc: Use image node_id 3 for calling the Attention obj's underlying member method code with example usage: obj.get_rel_pos(seq_size, rel_pos) and returns: paddle