code: def test_regression_1(self):
      # Test empty untyped inputs create outputs of indexing type, gh-5804
      (a,) = np.ix_(range(0))
      assert_equal(a.dtype, np.intp)
  
      (a,) = np.ix_([])
      assert_equal(a.dtype, np.intp)
  
      # but if the type is specified, don't change it
      (a,) = np.ix_(np.array([], dtype=np.float32))
      assert_equal(a.dtype, np.float32)
  
imports: import pytest
  import numpy
  from numpy.testing import assert_, assert_equal, assert_array_equal, assert_almost_equal, assert_array_almost_equal, assert_raises, assert_raises_regex
  from numpy.lib._index_tricks_impl import mgrid, ogrid, ndenumerate, fill_diagonal, diag_indices, diag_indices_from, index_exp, ndindex, c_, r_, s_, ix_
label_desc: Use image node_id 1 for calling the TestIx_ obj's underlying member method code with example usage: obj.test_regression_1() without return types