code: def randn(mean: float = 0.0, std: float = 1.0) -> "tune.sample.Float":
      """
      Sample a float from normal distribution.
  
      :param mean: Mean of the normal distribution. Default to 0.0.
      :param std: Std of the normal distribution. Default to 1.0.
      """
      return tune.randn(mean, std)
  
file_path: BigDL/python/orca/src/bigdl/orca/automl/hp.py
imports: import ray.tune
  import numpy
  from typing import List, Union, Callable
label_desc: Use image node_id 5 for calling a global function with example usage: randn(mean, std) and returns: tune