code: def setUp(self):
      super(RankingHeadTest, self).setUp()
      self._default_logits = [[1.0, 3.0, 2.0], [1.0, 2.0, 3.0]]
      self._default_labels = [[0.0, 0.0, 1.0], [0.0, 0.0, 2.0]]
      self._default_loss = 9.0
      self._default_weights = [1.0] * 3
      self._default_weights_feature_name = "weights"
      self._default_weighted_loss = 27
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import tensorflow
  from tensorflow import estimator
  from tensorflow_ranking.python import head
  from tensorflow_ranking.python import metrics
label_desc: Use image node_id 1 for calling the RankingHeadTest obj's underlying member method code with example usage: obj.setUp() without return types