class_docstr: Context Gating Layer
  Args:
      dimension (int): dimension
      add_batch_norm (bool): add batch normalization
code: def forward(self, x):
      x1 = self.fc(x)
      if self.add_batch_norm:
          x1 = self.batch_norm(x1)
      x = torch.cat((x, x1), 1)
      return F.glu(x, 1)
  
imports: import os
  import torch
  import torch.nn.functional
  from typing import Any, List, Dict
  from collections import OrderedDict
  from torch import nn
  from towhee.models.mdmmt.bert_mmt import BertMMT
label_desc: Use image node_id 2 for calling the ContextGating obj's underlying member method code with example usage: obj.forward(x) and returns: F