code: def _make_sp_mat(self, xp, sp, arr, dtype):
      a = xp.array(arr, dtype=dtype)
      a = sp.csr_matrix(a)
      return a
  
imports: import functools
  import re
  from unittest import mock
  import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy.cuda import runtime
  from cupyx.scipy import sparse
  from cupyx.scipy.sparse import _construct
label_desc: Use image node_id 1 for calling the TestKronsum obj's underlying member method code with example usage: obj._make_sp_mat(xp, sp, arr, dtype) and returns: a