code: def _check_param(self):
      if not isinstance(self._n_splits, int) or self._n_splits < 2:
          raise ValueError("n_splits should be positive integer >= 2")
  
file_path: FATE/python/fate/arch/dataframe/utils/_k_fold.py
imports: from .._dataframe import DataFrame
  from sklearn.model_selection import KFold
label_desc: Use image node_id 5 for calling the KFold obj's underlying member method code with example usage: obj._check_param() without return types