code: def brightness(
      im: np.ndarray, brightness_lower: float, brightness_upper: float
  ) -> np.ndarray:
      """
      Randomly disturb the brightness of the picture, user can use np.random.seed to fix the random behavior.
  
      Args:
          im(np.ndarray): Input image.
          brightness_lower(float): Lower bound of brightness.
          brightness_upper(float): Upper bound of brightness.
      """
      brightness_delta = np.random.uniform(
          brightness_lower, brightness_upper
      )
      im = PIL.ImageEnhance.Brightness(im).enhance(brightness_delta)
      return im
  
file_path: PaddleHub/paddlehub/vision/functional.py
imports: import os
  from typing import List, Union
  import cv2
  import PIL
  import numpy
label_desc: Use image node_id 7 for calling a global function with example usage: brightness(im, brightness_lower, brightness_upper) and returns: im