code: def _create_symmetric_matrix(self, n, dtype):
      a = testing.shaped_random((n, n), cupy, dtype, scale=1)
      a = a + a.T - cupy.eye(n, dtype=dtype)
      return a
  
file_path: cupy/tests/cupyx_tests/linalg_tests/test_solve.py
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy.cuda import runtime
  from cupyx import cusolver
  from cupy import testing
  import cupyx
label_desc: Use image node_id 2 for calling the TestErrorInvh obj's underlying member method code with example usage: obj._create_symmetric_matrix(n, dtype) and returns: a