code: def current_step(self) -> int:
      return self._current_step
  
imports: from __future__ import annotations
  import math
  import sys
  import numpy
  import shape_functions
  import transformation_functions
  from kurobako import problem
label_desc: Use image node_id 2 for calling the WFGEvaluator obj's underlying member method code with example usage: obj.current_step() and returns: self