code: def find(self):
      for A in self.cases:
          I, J, V = extract.find(A)
          assert_equal(
              A.toarray(), csr_matrix(((I, J), V), shape=A.shape)
          )
  
file_path: catboost/contrib/python/scipy/py3/scipy/sparse/tests/test_extract.py
imports: from numpy.testing import assert_equal
  from scipy.sparse import csr_matrix
  import numpy
  from scipy.sparse import extract
label_desc: Use image node_id 2 for calling the TestExtract obj's underlying member method code with example usage: obj.find() without return types