code: def _is_using_pandas(endog, exog):
      from statsmodels.compat.pandas import data_klasses as klasses
  
      return isinstance(endog, klasses) or isinstance(exog, klasses)
  
file_path: statsmodels/statsmodels/tools/data.py
imports: from statsmodels.compat.numpy import NP_LT_2
  import numpy
  import pandas
label_desc: Use image node_id 9 for calling a global function with example usage: _is_using_pandas(endog, exog) and returns: unknown