code: def test_cho_factor_empty_square(self):
      a = empty((0, 0))
      b = array([])
      c = array([[]])
      d = []
      e = [[]]
  
      x, _ = cho_factor(a)
      assert_array_equal(x, a)
  
      for x in [b, c, d, e]:
          assert_raises(ValueError, cho_factor, x)
  
imports: from __future__ import division, print_function, absolute_import
  from numpy.testing import assert_array_almost_equal, assert_array_equal
  from pytest import raises
  from numpy import array, transpose, dot, conjugate, zeros_like, empty
  from numpy.random import random
  from scipy.linalg import cholesky, cholesky_banded, cho_solve_banded, cho_factor, cho_solve
  from scipy.linalg._testutils import assert_no_overwrite
label_desc: Use image node_id 1 for calling the TestEmptyArray obj's underlying member method code with example usage: obj.test_cho_factor_empty_square() without return types