code: def optimizer(self):
      return LocalBestPSO
  
file_path: pyswarms/tests/optimizers/test_local_best.py
imports: import pytest
  import numpy
  from pyswarms.single import LocalBestPSO
  from pyswarms.utils.functions.single_obj import sphere
  from .abc_test_optimizer import ABCTestOptimizer
label_desc: Use image node_id 1 for calling the TestLocalBestOptimizer obj's underlying member method code with example usage: obj.optimizer() and returns: LocalBestPSO