code: def with_pos_embed(self, tensor, pos: Optional[Tensor]):
      return tensor if pos is None else tensor + pos
  
imports: import copy
  import math
  from typing import Optional
  import torch
  import torch.nn.functional
  from torch import Tensor, nn
label_desc: Use image node_id 3 for calling the SelfAttentionLayer obj's underlying member method code with example usage: obj.with_pos_embed(tensor, pos) and returns: unknown