code: def ioa(boxes1, boxes2):
      """Computes pairwise intersection-over-area between box collections.
  
      Intersection-over-area (ioa) between two boxes box1 and box2 is defined as
      their intersection area over box2's area. Note that ioa is not symmetric,
      that is, IOA(box1, box2) != IOA(box2, box1).
  
      Args:
        boxes1: a numpy array with shape [N, 4] holding N boxes.
        boxes2: a numpy array with shape [M, 4] holding N boxes.
  
      Returns:
        a numpy array with shape [N, M] representing pairwise ioa scores.
      """
      intersect = intersection(boxes1, boxes2)
      areas = np.expand_dims(area(boxes2), axis=0)
      return intersect / areas
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import numpy
label_desc: Use image node_id 4 for calling a global function with example usage: ioa(boxes1, boxes2) and returns: unknown