code: def forward(self, low_level, high_level, prev_feature):
      level = self.seb(low_level, high_level)
      level = self.gcn(level)
  
      return self.upconv(level + prev_feature)
  
imports: import torch
  import torch.nn
label_desc: Use image node_id 2 for calling the ExFuseLevel obj's underlying member method code with example usage: obj.forward(low_level, high_level, prev_feature) and returns: self