code: def encode(self, col: str, item: str) -> List[int]:
      if col in self.column_codes:
          return self.column_codes[col].encode(item)
      else:
          raise ValueError(f"cannot encode {col} {item}")
  
imports: import math
  from typing import Dict, List, Tuple
  import numpy
  from numpy import ndarray
  from sklearn.preprocessing import PowerTransformer, QuantileTransformer, RobustScaler
  from nemo.utils import logging
label_desc: Use image node_id 4 for calling the ColumnCodes obj's underlying member method code with example usage: obj.encode(col, item) and returns: self