code: def verify_solve_grad(self, m, n, A_structure, lower, rng):
      # ensure diagonal elements of A relatively large to avoid numerical
      # precision issues
      A_val = (rng.normal(size=(m, m)) * 0.5 + np.eye(m)).astype(
          config.floatX
      )
      if A_structure == "lower_triangular":
          A_val = np.tril(A_val)
      elif A_structure == "upper_triangular":
          A_val = np.triu(A_val)
      if n is None:
          b_val = rng.normal(size=m).astype(config.floatX)
      else:
          b_val = rng.normal(size=(m, n)).astype(config.floatX)
      eps = None
      if config.floatX == "float64":
          eps = 2e-8
      solve_op = Solve(A_structure=A_structure, lower=lower)
      utt.verify_grad(solve_op, [A_val, b_val], 3, rng, eps=eps)
  
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 5 for calling the test_Solve obj's underlying member method code with example usage: obj.verify_solve_grad(m, n, A_structure, lower, rng) without return types