code: def encode(bimask):
      if len(bimask.shape) == 3:
          return _mask.encode(bimask)
      elif len(bimask.shape) == 2:
          h, w = bimask.shape
          return _mask.encode(bimask.reshape((h, w, 1), order="F"))[0]
  
imports: import json
  import pathlib
  import zipfile
  import numpy
  from tinygrad.helpers import fetch
  import pycocotools._mask
  from examples.mask_rcnn import Masker
  from pycocotools.coco import COCO
  from pycocotools.cocoeval import COCOeval
label_desc: Use image node_id 2 for calling a global function with example usage: encode(bimask) and returns: _mask, _mask