code: def istopology(x):
      """Helper predicate to check if it's a subclass"""
      return inspect.isclass(x) and not inspect.isabstract(x)
  
imports: import inspect
  import numpy
  import pytest
  import pyswarms.backend.topology
  from pyswarms.single import GeneralOptimizerPSO
  from pyswarms.utils.functions.single_obj import sphere
  from .abc_test_optimizer import ABCTestOptimizer
label_desc: Use image node_id 1 for calling a global function with example usage: istopology(x) and returns: unknown