code: def box_area(boxes):
      """
      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
      Returns:
          area (Tensor[N]): area for each box
      """
      return (boxes[:, 2] - boxes[:, 0]) * (boxes[:, 3] - boxes[:, 1])
  
imports: from collections import OrderedDict
  import torch
  from torch import nn
  from torch.jit.annotations import Dict
  from torch.nn import functional
label_desc: Use image node_id 11 for calling a global function with example usage: box_area(boxes) and returns: unknown