code: def _apply_on_cols(self) -> List[Callable]:
      raise NotImplementedError()
  
imports: from abc import ABC, abstractmethod
  from typing import Callable, Dict, List, Optional, Union
  from synapse.ml.cyber.utils.spark_utils import ExplainBuilder, HasSetInputCol, HasSetOutputCol
  from pyspark.ml import Estimator, Transformer
  from pyspark.ml.param.shared import HasInputCol, HasOutputCol, Param, Params
  from pyspark.sql import DataFrame, functions, types
label_desc: Use image node_id 3 for calling the PerPartitionScalarScalerEstimator obj's underlying member method code with example usage: obj._apply_on_cols() without return types