code: def holes(cls, dataset):
      coords = cls.values(dataset, dataset.kdims[0])
      splits = np.where(np.isnan(coords.astype("float")))[0]
      return [[[]] * (len(splits) + 1)]
  
imports: import sys
  import warnings
  import numpy
  import param
  from ..None import util
  from ..element import Element
  from ..ndmapping import NdMapping
  from .util import finite_range
label_desc: Use image node_id 29 for calling the Interface obj's underlying member method code with example usage: obj.holes(cls, dataset) and returns: list