code: def test_feature_matrices():
      """test that feature matrices are correctly checked"""
      x, y = nr.rand(10, 1), nr.rand(12)
      check_feature_matrices(x, y)
      check_feature_matrices(y, x)
      check_feature_matrices(x, x)
      check_feature_matrices(y, y)
  
file_path: nipy/nipy/algorithms/graph/tests/test_bipartite_graph.py
imports: import numpy
  import numpy.random
  from ..bipartite_graph import check_feature_matrices, cross_eps, cross_knn
label_desc: Use image node_id 2 for calling a global function with example usage: test_feature_matrices() without return types