code: def imflip_(img, direction="horizontal"):
      """Inplace flip an image horizontally or vertically.
  
      Args:
          img (ndarray): Image to be flipped.
          direction (str): The flip direction, either "horizontal" or
              "vertical" or "diagonal".
  
      Returns:
          ndarray: The flipped image (inplace).
      """
      assert direction in ["horizontal", "vertical", "diagonal"]
      if direction == "horizontal":
          return cv2.flip(img, 1, img)
      elif direction == "vertical":
          return cv2.flip(img, 0, img)
      else:
          return cv2.flip(img, -1, img)
  
imports: import numbers
  import cv2
  import numpy
  from ..utils import to_2tuple
  from .io import imread_backend
label_desc: Use image node_id 8 for calling a global function with example usage: imflip_(img, direction) and returns: cv2, cv2, cv2