code: def _loss(self):
      # Weight decay loss
      for var in self.layers[0].vars.values():
          self.loss += self.weight_decay * tf.nn.l2_loss(var)
  
      # Cross entropy error
      self.loss += masked_softmax_cross_entropy(
          self.outputs,
          self.placeholders["labels"],
          self.placeholders["labels_mask"],
      )
  
imports: from .layers import *
  from .metrics import *
label_desc: Use image node_id 2 for calling the GCN obj's underlying member method code with example usage: obj._loss() without return types