code: def invert_input(X):
      X = X.copy()
      mean = np.array([0.485, 0.456, 0.406])
      variance = np.array([0.229, 0.224, 0.225])
  
      X *= variance * 255
      X += mean * 255
      return X.clip(0, 255).astype("uint8")
  
imports: import typing
  import cv2
  import numpy
  import tensorflow
  import efficientnet.tfkeras
  from tensorflow import keras
  from .None import tools
label_desc: Use image node_id 2 for calling a global function with example usage: invert_input(X) and returns: X