code: def test_masked_array_create(self):
      # Ticket #17
      x = np.ma.masked_array(
          [0, 1, 2, 3, 0, 4, 5, 6], mask=[0, 0, 0, 1, 1, 1, 0, 0]
      )
      assert_array_equal(np.ma.nonzero(x), [[1, 2, 6, 7]])
  
file_path: catboost/contrib/python/numpy/py3/numpy/ma/tests/test_regression.py
imports: import numpy
  from numpy.testing import assert_, assert_array_equal, assert_allclose, suppress_warnings
label_desc: Use image node_id 1 for calling the TestRegression obj's underlying member method code with example usage: obj.test_masked_array_create() without return types