code: def add_box(self, box: np.ndarray, color: np.ndarray = None):
      if color is None:
          color = self.edgecolor
      (x0, y0, x1, y1) = box
      width = x1 - x0
      height = y1 - y0
      self.ax.add_patch(
          mpl.patches.Rectangle(
              (x0, y0),
              width,
              height,
              fill=False,
              edgecolor=color,
              linewidth=self.font_size // 3,
              alpha=self.alpha,
              linestyle=self.linestyle,
          )
      )
  
imports: import colorsys
  import io
  import os
  from typing import Union
  import matplotlib
  import matplotlib.colors
  import matplotlib.figure
  import numpy
  import requests
  import torch
  from matplotlib.backends.backend_agg import FigureCanvasAgg
  from mmf.datasets.processors.frcnn_processor import img_tensorize
  from PIL import Image
label_desc: Use image node_id 2 for calling the SingleImageViz obj's underlying member method code with example usage: obj.add_box(box, color) without return types