code: def area(boxes):
      """Computes area of boxes.
  
      Args:
        boxes: Numpy array with shape [N, 4] holding N boxes
  
      Returns:
        a numpy array with shape [N*1] representing box areas
      """
      return (boxes[:, 2] - boxes[:, 0]) * (boxes[:, 3] - boxes[:, 1])
  
imports: import numpy
label_desc: Use image node_id 1 for calling a global function with example usage: area(boxes) and returns: unknown