code: def explain(self, inp, ind=None, raw_inp=None):
      return self._backprop(inp, ind)
  
imports: import numpy
  from torch.autograd import Variable, Function
  import torch
  import types
label_desc: Use image node_id 3 for calling the VanillaGradExplainer obj's underlying member method code with example usage: obj.explain(inp, ind, raw_inp) and returns: self