code: def _make_matrix(self, sp, dtype):
      shape = self.n_rows, self.n_cols
      return testing.shaped_sparse_random(
          shape, sp, dtype, self.density, self.format
      )
  
imports: import functools
  import itertools
  import numpy
  import pytest
  import cupy
  import cupyx
  from cupy import testing
  from cupy.cuda import runtime
  from cupyx.scipy import sparse
label_desc: Use image node_id 1 for calling the IndexingTestBase obj's underlying member method code with example usage: obj._make_matrix(sp, dtype) and returns: testing