code: def forward(self, x):
      return x + self.pos_table[:, : x.shape[1]].clone().detach()
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import paddle
  from paddle import ParamAttr
  import paddle.nn
  import paddle.nn.functional
  from paddle.nn.initializer import Normal, XavierNormal
  import numpy
label_desc: Use image node_id 3 for calling the PositionalEncoding obj's underlying member method code with example usage: obj.forward(x) and returns: unknown