code: def length(cls, dataset):
      geom_type = cls.geom_type(dataset)
      if geom_type != "Point":
          return len(dataset.data)
      return sum([geom_length(g) for g in dataset.data.geometry])
  
imports: import sys
  import warnings
  from collections import defaultdict
  import numpy
  import pandas
  from holoviews.core.util import isscalar, unique_iterator, unique_array
  from holoviews.core.data import Dataset, Interface, MultiInterface, PandasAPI
  from holoviews.core.data.interface import DataError
  from holoviews.core.data import PandasInterface
  from holoviews.core.data.spatialpandas import get_value_array
  from holoviews.core.dimension import dimension_name
  from holoviews.element import Path
  from ..util import asarray, geom_to_array, geom_types, geom_length
  from .geom_dict import geom_from_dict
label_desc: Use image node_id 23 for calling the GeoPandasInterface obj's underlying member method code with example usage: obj.length(cls, dataset) and returns: sum, len