code: def forward(self, inputs, device):
      out = functions.tree_lstm(*list(inputs))
      return out
  
file_path: chainer/tests/chainer_tests/functions_tests/rnn_tests/test_function_tree_lstm.py
imports: import numpy
  import six
  from chainer import functions
  from chainer import testing
  from chainer.testing import backend
label_desc: Use image node_id 3 for calling the TestTreeLSTM obj's underlying member method code with example usage: obj.forward(inputs, device) and returns: out