class_docstr: Run parameters for TCAV.
code: def get_key(self):
      return "_".join(
          [
              str(self.bottleneck),
              "_".join(self.concepts),
              "target_" + self.target_class,
              "alpha_" + str(self.alpha),
          ]
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
label_desc: Use image node_id 2 for calling the RunParams obj's underlying member method code with example usage: obj.get_key() and returns: str