class_docstr: LocalBBExplainer is the base class for local post-hoc black-box explainers (LBBE).
  Such explainers are model agnostic and generally require access to model's predict function alone.
  Examples include LIME[#1]_, SHAP[#2]_, etc..
  
  References:
      .. [#1] “Why Should I Trust You?” Explaining the Predictions of Any Classifier, ACM SIGKDD 2016.
      Marco Tulio Ribeiro, Sameer Singh, Carlos Guestrin. https://arxiv.org/abs/1602.04938.
      .. [#2] A Unified Approach to Interpreting Model Predictions, NIPS 2017.
      Lundberg, Scott M and Lee, Su-In. https://arxiv.org/abs/1705.07874
docstr: Explain an input instance x.
docstr_tok: ["Explain","an","input","instance","x","."]
code: def explain_instance(self, *argv, **kwargs):
      """
      Explain an input instance x.
      """
      raise NotImplementedError
  
imports: import abc
  import sys
label_desc: Use image node_id 3 for calling the LocalBBExplainer obj's underlying member method code with example usage: obj.explain_instance() without return types