code: def default_target_policy_smoothing_func(batch_action):
      """Add noises to actions for target policy smoothing."""
      xp = cuda.get_array_module(batch_action)
      noise = xp.clip(
          xp.random.normal(
              loc=0, scale=0.2, size=batch_action.shape
          ).astype(batch_action.dtype),
          -0.5,
          0.5,
      )
      return xp.clip(batch_action + noise, -1, 1)
  
imports: import collections
  import copy
  from logging import getLogger
  import chainer
  from chainer import cuda
  import chainer.functions
  import numpy
  from chainerrl.agent import AttributeSavingMixin
  from chainerrl.agent import BatchAgent
  from chainerrl.misc.batch_states import batch_states
  from chainerrl.misc.copy_param import synchronize_parameters
  from chainerrl.replay_buffer import batch_experiences
  from chainerrl.replay_buffer import ReplayUpdater
label_desc: Use image node_id 2 for calling a global function with example usage: default_target_policy_smoothing_func(batch_action) and returns: xp