code: def apply_node_func(self, nodes):
      iou = nodes.data["iou"]
      b_iou, c = self.b_iou.data(iou.context), nodes.data["c"]
      h, c = self._apply_node_func(iou, b_iou, c)
      return {"h": h, "c": c}
  
imports: import itertools
  import time
  import dgl
  import mxnet
  import networkx
  import numpy
  from mxnet import gluon
label_desc: Use image node_id 3 for calling the _TreeLSTMCell obj's underlying member method code with example usage: obj.apply_node_func(nodes) and returns: dict