code: def _test_pass_matrix(x):
      y = pass_matrix(x)
      assert_array_equal(y, x)
      y = pass_matrix(x.T)
      assert_array_equal(y, x.T)
  
imports: import numpy
  from numpy.testing import assert_almost_equal, assert_array_equal
  from ..None import c_types, copy_vector, copy_via_iterators, fff_type, npy_type, pass_array, pass_matrix, pass_vector, pass_vector_via_iterator, sum_via_iterators
label_desc: Use image node_id 11 for calling a global function with example usage: _test_pass_matrix(x) without return types