code: def forward(self, x):
      x_n = self.norm(x)
      return x_n
  
imports: import math
  import os
  import paddle
  import paddle.nn
  import paddle.nn.functional
label_desc: Use image node_id 2 for calling the BatchNorm1d obj's underlying member method code with example usage: obj.forward(x) and returns: x_n