code: def test_solve_grad(self):
      if not imported_scipy:
          raise SkipTest("Scipy needed for the Solve op.")
      rng = np.random.RandomState(utt.fetch_seed())
      structures = ["general", "lower_triangular", "upper_triangular"]
      for A_structure in structures:
          lower = A_structure == "lower_triangular"
          self.verify_solve_grad(5, None, A_structure, lower, rng)
          self.verify_solve_grad(6, 1, A_structure, lower, rng)
          self.verify_solve_grad(4, 3, A_structure, lower, rng)
      # lower should have no effect for A_structure == 'general' so also
      # check lower=True case
      self.verify_solve_grad(4, 3, "general", lower=True, rng=rng)
  
imports: from __future__ import absolute_import, print_function, division
  import unittest
  import numpy
  import numpy.linalg
  from numpy.testing import assert_array_almost_equal
  from numpy.testing import dec, assert_array_equal, assert_allclose
  from numpy import inf
  import itertools
  import theano
  from theano import tensor, function, grad
  from theano.tensor.basic import _allclose
  from theano.tests.test_rop import break_op
  from theano.tests import unittest_tools
  from theano import config
  from theano.tensor.slinalg import Cholesky, cholesky, CholeskyGrad, Solve, solve, Eigvalsh, EigvalshGrad, eigvalsh, expm, kron
  from theano.tests.unittest_tools import attr
  from nose.plugins.skip import SkipTest
  from nose.tools import assert_raises
label_desc: Use image node_id 6 for calling the test_Solve obj's underlying member method code with example usage: obj.test_solve_grad() without return types