code: def test_simple(self):
      m = hb_read(StringIO(SIMPLE))
      assert_csc_almost_equal(m, SIMPLE_MATRIX)
  
file_path: catboost/contrib/python/scipy/py3/scipy/io/harwell_boeing/tests/test_hb.py
imports: from io import StringIO
  import tempfile
  import numpy
  from numpy.testing import assert_equal, assert_array_almost_equal_nulp
  from scipy.sparse import coo_matrix, csc_matrix, rand
  from scipy.io import hb_read, hb_write
label_desc: Use image node_id 1 for calling the TestHBReader obj's underlying member method code with example usage: obj.test_simple() without return types