code: def feat_compute(
      self,
      x: Union[np.ndarray, "tsFrame"],
  ):
      raise NotImplemented(
          "Error: method feat_compute() not implemented in base class!"
      )
  
file_path: AIX360/aix360/algorithms/tsutils/tsfeatures/tsfeatures.py
imports: import numpy
  from typing import Union, List
  from abc import ABC, abstractmethod
  from aix360.algorithms.tsutils.tsframe import tsFrame
label_desc: Use image node_id 2 for calling the TSFeatures obj's underlying member method code with example usage: obj.feat_compute(x) without return types