code: def _check_pointer(self, a, b):
      if a is not None and b is not None:
          assert self._get_pointer(a) == self._get_pointer(b)
  
imports: import numpy
  import pytest
  import cupy
  from cupy import cublas
  from cupy import testing
label_desc: Use image node_id 4 for calling the TestLevel1Functions obj's underlying member method code with example usage: obj._check_pointer(a, b) without return types