code: def iou(box_mask_list1, box_mask_list2):
      """Computes pairwise intersection-over-union between box and mask collections.
  
      Args:
        box_mask_list1: BoxMaskList holding N boxes and masks
        box_mask_list2: BoxMaskList holding M boxes and masks
  
      Returns:
        a numpy array with shape [N, M] representing pairwise iou scores.
      """
      return np_mask_ops.iou(
          box_mask_list1.get_masks(), box_mask_list2.get_masks()
      )
  
file_path: SlowFast/ava_evaluation/np_box_mask_list_ops.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import numpy
  from .None import np_box_list_ops, np_box_mask_list, np_mask_ops
label_desc: Use image node_id 4 for calling a global function with example usage: iou(box_mask_list1, box_mask_list2) and returns: np_mask_ops