code: def setup_method(self):
      a = np.arange(9) - 4
      b = a.reshape((3, 3))
      self.b = scipy.sparse.csr_matrix(b)
  
file_path: catboost/contrib/python/scipy/py2/scipy/sparse/linalg/tests/test_norm.py
imports: from __future__ import division, print_function, absolute_import
  import numpy
  from numpy.linalg import norm
  from numpy.testing import assert_equal, assert_allclose
  from pytest import raises
  from scipy._lib._version import NumpyVersion
  import scipy.sparse
  from scipy.sparse.linalg import norm
label_desc: Use image node_id 1 for calling the TestNorm obj's underlying member method code with example usage: obj.setup_method() without return types