code: def forward(self, x):
      x = self.sequence(x)
      return x
  
imports: from collections import OrderedDict
  from nni.retiarii.serializer import basic_unit
  import torch
  import nni.retiarii.nn.pytorch
  from putils import get_same_padding, build_activation
label_desc: Use image node_id 4 for calling the LinearLayer obj's underlying member method code with example usage: obj.forward(x) and returns: x