code: def build_2d_sincos_position_embedding(
      self,
      w,
      h,
      embed_dim=1024,
      temperature=10000.0,
  ):
      grid_w = paddle.arange(int(w), dtype=paddle.float32)
      grid_h = paddle.arange(int(h), dtype=paddle.float32)
      grid_w, grid_h = paddle.meshgrid(grid_w, grid_h)
      assert (
          embed_dim % 4 == 0
      ), "Embed dimension must be divisible by 4 for 2D sin-cos position embedding"
      pos_dim = embed_dim // 4
      omega = paddle.arange(pos_dim, dtype=paddle.float32) / pos_dim
      omega = 1.0 / (temperature**omega)
  
      out_w = grid_w.flatten()[..., None] @ omega[None]
      out_h = grid_h.flatten()[..., None] @ omega[None]
  
      pos_emb = paddle.concat(
          [
              paddle.sin(out_w),
              paddle.cos(out_w),
              paddle.sin(out_h),
              paddle.cos(out_h),
          ],
          axis=1,
      )[None, :, :]
  
      return pos_emb
  
imports: import math
  import copy
  import numpy
  import paddle
  import paddle.nn
  import paddle.nn.functional
  from ppdet.core.workspace import register, serializable
  from ppdet.modeling.layers import DropBlock, MultiHeadAttention
  from ppdet.modeling.ops import get_act_fn
  from ..backbones.cspresnet import ConvBNLayer, BasicBlock
  from ..shape_spec import ShapeSpec
  from ..initializer import linear_init_
label_desc: Use image node_id 2 for calling the CustomCSPPAN obj's underlying member method code with example usage: obj.build_2d_sincos_position_embedding(w, h, embed_dim, temperature) and returns: pos_emb