code: def setUp(self):
      super(LinearScalarizerTest, self).setUp()
      self._scalarizer = multi_objective_scalarizer.LinearScalarizer(
          [1, 2, 3, -1]
      )
      self._batch_multi_objectives = tf.constant(
          [[1, 2, 3, 4], [5, 6, 7, 8], [-1, -2, -3, -4]],
          dtype=tf.float32,
      )
  
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 1 for calling the LinearScalarizerTest obj's underlying member method code with example usage: obj.setUp() without return types