code: def standardized(array: np.ndarray):
      """Normalize the values in an array.
  
      Args:
          array (np.ndarray): Array of values to normalize.
  
      Returns:
          array with zero mean and unit standard deviation.
      """
      return (array - array.mean()) / max(1e-4, array.std())
  
file_path: ray/rllib/utils/sgd.py
imports: import logging
  import numpy
  import random
  from ray.rllib.utils.annotations import DeveloperAPI
  from ray.rllib.policy.sample_batch import SampleBatch, MultiAgentBatch
  from ray.rllib.utils.metrics.learner_info import LearnerInfoBuilder
label_desc: Use image node_id 1 for calling a global function with example usage: standardized(array) and returns: unknown