code: def box_area(boxes: np.array) -> np.array:
      """
      Computes the area of a set of bounding boxes, which are specified by its
      (x1, y1, x2, y2) coordinates.
  
      Args:
          boxes (Tensor[N, 4]): boxes for which the area will be computed. They
              are expected to be in (x1, y1, x2, y2) format with
              ``0 <= x1 < x2`` and ``0 <= y1 < y2``.
  
      Returns:
          area (Tensor[N]): area for each box
      """
      assert boxes.ndim == 2 and boxes.shape[-1] == 4
      return (boxes[:, 2] - boxes[:, 0]) * (boxes[:, 3] - boxes[:, 1])
  
imports: import xml.etree.ElementTree
  from collections import defaultdict
  from pathlib import Path
  from typing import Any, Dict, List, Optional, Sequence, Tuple, Union
  import numpy
  from prettytable import PrettyTable
  from tqdm import tqdm
  import json
  import os
  import re
label_desc: Use image node_id 6 for calling a global function with example usage: box_area(boxes) and returns: unknown