code: def forward(self, t, y):
      return self.mul * self.base_func(-t, y)
  
imports: from enum import Enum
  import math
  import numpy
  import torch
  import warnings
  from .event_handling import combine_event_functions
label_desc: Use image node_id 2 for calling the _ReverseFunc obj's underlying member method code with example usage: obj.forward(t, y) and returns: unknown