class_docstr: Interface for ranking head.
class_docstr_tok: ["Interface","for","ranking","head","."]
docstr: The head name.
docstr_tok: ["The","head","name","."]
code: def name(self):
      """The head name."""
      raise NotImplementedError("Calling an abstract method.")
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import abc
  import six
  import tensorflow
  from tensorflow import estimator
label_desc: Use image node_id 1 for calling the _AbstractRankingHead obj's underlying member method code with example usage: obj.name() without return types