code: def testInvalidParams(self):
      with self.assertRaisesRegex(ValueError, "nearly-zero vector"):
          multi_objective_scalarizer.HyperVolumeScalarizer([], [])
      with self.assertRaisesRegex(
          ValueError, "at least two objectives"
      ):
          multi_objective_scalarizer.HyperVolumeScalarizer(
              [1], [self._hv_params[0]]
          )
  
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 2 for calling the HyperVolumeScalarizerTest obj's underlying member method code with example usage: obj.testInvalidParams() without return types