code: def test_repeated_input(self):
      length_of_vector = 5
      x = np.arange(length_of_vector)
      out = ix_(x, x)
      assert_equal(out[0].shape, (length_of_vector, 1))
      assert_equal(out[1].shape, (1, length_of_vector))
      # check that input shape is not modified
      assert_equal(x.shape, (length_of_vector,))
  
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 5 for calling the TestIx_ obj's underlying member method code with example usage: obj.test_repeated_input() without return types