code: def test_lu_solve_backend(self, xp, dtype):
      a_shape, b_shape = self.shapes
      A = testing.shaped_random(a_shape, xp, dtype=dtype)
      b = testing.shaped_random(b_shape, xp, dtype=dtype)
      if xp is numpy:
          lu = scipy.linalg.lu_factor(A)
          backend = "scipy"
      else:
          lu = cupyx.scipy.linalg.lu_factor(A)
          backend = cupyx.scipy.linalg
      with scipy.linalg.set_backend(backend):
          out = scipy.linalg.lu_solve(lu, b, trans=self.trans)
      return out
  
file_path: cupy/tests/cupyx_tests/scipy_tests/linalg_tests/test_decomp_lu.py
imports: import unittest
  import warnings
  import numpy
  import cupy
  from cupy import testing
  import cupyx.scipy.linalg
label_desc: Use image node_id 2 for calling the TestLUSolve obj's underlying member method code with example usage: obj.test_lu_solve_backend(xp, dtype) and returns: out