class_docstr: A goal function defined on a model that outputs a probability for some
  number of classes.
docstr: Returns the class of this goal function's results.
code: def _goal_function_result_type(self):
      """Returns the class of this goal function's results."""
      return ClassificationGoalFunctionResult
  
file_path: TextAttack/textattack/goal_functions/classification/classification_goal_function.py
imports: import numpy
  import torch
  from textattack.goal_function_results import ClassificationGoalFunctionResult
  from textattack.goal_functions import GoalFunction
label_desc: Use image node_id 2 for calling the ClassificationGoalFunction obj's underlying member method code with example usage: obj._goal_function_result_type() and returns: ClassificationGoalFunctionResult