class_docstr: Attribute:
      polygons (list[ndarray]): list[ndarray]: polygons for this mask.
          Each ndarray has format [x, y, x, y, ...]
      mask (ndarray): a binary mask
code: def area(self):
      return self.mask.sum()
  
imports: import colorsys
  import logging
  import math
  from enum import Enum, unique
  import numpy
  import matplotlib
  import matplotlib.colors
  import matplotlib.figure
  import torch
  from matplotlib.backends.backend_agg import FigureCanvasAgg
  from PIL import Image
  from ..data.registry.catalog import MetadataCatalog
  from ..data.structures import BitMasks, Boxes, BoxMode, Keypoints, PolygonMasks
label_desc: Use image node_id 7 for calling the GenericMask obj's underlying member method code with example usage: obj.area() and returns: self