class_docstr: A speaker with its names, list of mentions and matching test functions
code: def __str__(self):
      return f"{self.speaker_id} <names> {self.speaker_names}"
  
imports: import re
  import io
  from six import string_types, integer_types
  from spacy.tokens import Span, Token
  from neuralcoref.train.compat import unicode_
  from neuralcoref.train.utils import encode_distance, parallel_process
  import spacy
  import numpy
label_desc: Use image node_id 2 for calling the Speaker obj's underlying member method code with example usage: obj.__str__() and returns: self, str, self