code: def testInvalidObjectives(self):
      with self.assertRaisesRegex(
          ValueError, "The number of input objectives should be"
      ):
          multi_objectives = tf.constant([[1, 2, 3]], dtype=tf.float32)
          self._scalarizer(multi_objectives)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import copy
  import tensorflow.compat.v2
  from tf_agents.bandits.multi_objective import multi_objective_scalarizer
label_desc: Use image node_id 3 for calling the LinearScalarizerTest obj's underlying member method code with example usage: obj.testInvalidObjectives() without return types