class_docstr: Coref Sample
class_docstr_tok: ["Coref","Sample"]
docstr: the number of sentences in this sample
  
  :param:
  :return int: the number of sentences in this sample
docstr_tok: ["the","number","of","sentences","in","this","sample",":","param",":",":","return","int",":","the","number","of","sentences","in","this","sample"]
code: def num_sentences(self):
      r"""
      the number of sentences in this sample
  
      :param:
      :return int: the number of sentences in this sample
  
      """
      return len(self.sen_map)
  
imports: from ....common.settings import ORIGIN, TASK_MASK
  from ....common.utils.fp_utils import *
  from ....common.utils.shift_utils import *
  from .sample import Sample
  from ..field import ListField, TextField
label_desc: Use image node_id 8 for calling the CorefSample obj's underlying member method code with example usage: obj.num_sentences() and returns: len