code: def test_attri2vec_nodemapper_constructor():
      n_feat = 4
  
      G = example_graph(feature_size=n_feat)
  
      generator = Attri2VecNodeGenerator(G, batch_size=2)
  
      mapper = generator.flow(list(G.nodes()))
  
      assert generator.batch_size == 2
      assert mapper.data_size == 4
      assert len(mapper.ids) == 4
  
imports: from stellargraph.core.graph import *
  from stellargraph.mapper import *
  import networkx
  import numpy
  import random
  import pytest
  import pandas
  import scipy.sparse
  from ..test_utils.graphs import example_graph, example_graph_random, example_hin_1, create_graph_features, repeated_features, weighted_tree
  from ..None import test_utils
label_desc: Use image node_id 29 for calling a global function with example usage: test_attri2vec_nodemapper_constructor() without return types