code: def test_node_iter(self):
      np_graph = create_random_graph().numpy()
      pd_graph = create_random_graph().tensor()
  
      for graph in [np_graph, pd_graph]:
          assert len(graph.nodes) == graph.num_nodes
          for shuffle in [True, False]:
              for batch_data in graph.node_batch_iter(
                  batch_size=3, shuffle=shuffle
              ):
                  break
  
imports: import os
  import unittest
  import numpy
  import paddle
  import pgl
  from testsuite import create_random_graph
label_desc: Use image node_id 14 for calling the GraphTest obj's underlying member method code with example usage: obj.test_node_iter() without return types