code: def dummy_class(self, sp):
      if sp is sparse:
  
          class DummySparseGPU(sparse.spmatrix):
              def __init__(self, maxprint=50, shape=None, nnz=0):
                  super(DummySparseGPU, self).__init__(maxprint)
                  self._shape = shape
                  self._nnz = nnz
  
              def get_shape(self):
                  return self._shape
  
              def getnnz(self):
                  return self._nnz
  
          return DummySparseGPU
      else:
  
          class DummySparseCPU(scipy.sparse._base._spbase):
              def __init__(self, maxprint=50, shape=None, nnz=0):
                  super(DummySparseCPU, self).__init__(maxprint)
                  self._shape = shape
                  self._nnz = nnz
  
              def _getnnz(self):
                  return self._nnz
  
          return DummySparseCPU
  
file_path: cupy/tests/cupyx_tests/scipy_tests/sparse_tests/test_base.py
imports: import unittest
  import pytest
  from cupy import testing
  from cupyx.scipy import sparse
label_desc: Use image node_id 1 for calling the TestSpmatrix obj's underlying member method code with example usage: obj.dummy_class(sp) and returns: DummySparseGPU, DummySparseCPU, self, self, self