code: def forward(self, x):
      # [T, N, F]
      return x + self.pe[: x.size(0), :]
  
imports: from __future__ import division
  from __future__ import print_function
  import numpy
  import pandas
  import copy
  import math
  from ...utils import get_or_create_path
  from ...log import get_module_logger
  import torch
  import torch.nn
  import torch.optim
  from torch.utils.data import DataLoader
  from ...model.base import Model
  from ...data.dataset import DatasetH
  from ...data.dataset.handler import DataHandlerLP
label_desc: Use image node_id 2 for calling the PositionalEncoding obj's underlying member method code with example usage: obj.forward(x) and returns: unknown