code: def _evaluate_standard(op, op_str, a, b, **eval_kwargs):
      """standard evaluation"""
      if _TEST_MODE:
          _store_test_result(False)
      with np.errstate(all="ignore"):
          return op(a, b)
  
file_path: catboost/contrib/python/pandas/py2/pandas/core/computation/expressions.py
imports: import warnings
  import numpy
  from pandas.core.dtypes.generic import ABCDataFrame
  import pandas.core.common
  from pandas.core.computation.check import _NUMEXPR_INSTALLED
  from pandas.core.config import get_option
label_desc: Use image node_id 3 for calling a global function with example usage: _evaluate_standard(op, op_str, a, b) and returns: op