class_docstr: Linear multiple rewards generator.
code: def __init__(self, thetas):
      self.thetas = thetas
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import functools
  import gin
  import numpy
  from six.moves import range
  import tensorflow
  from tf_agents.bandits.agents import utils
  from tf_agents.bandits.environments import wheel_py_environment
label_desc: Use image node_id 1 to create a new LinearNormalMultipleRewards object from inherited base classes: object with example: obj = LinearNormalMultipleRewards(thetas)