code: def _check_op(op, *args, **kwargs):
      r_dense = _run_dense_op(op, *args, **kwargs)
      r_sparse = _run_sparse_op(op, *args, **kwargs)
      _check_results_equal(r_dense, r_sparse)
  
imports: import networkx
  import numpy
  import pytest
  import scipy.sparse
  from spektral.utils import convolution
label_desc: Use image node_id 4 for calling a global function with example usage: _check_op(op) without return types