code: def nclasses(self):
      return len(self.p._label_vocab._id2token)
  
file_path: ktrain/ktrain/text/ner/dataset.py
imports: from ...dataset import SequenceDataset
  from ...imports import *
label_desc: Use image node_id 9 for calling the NERSequence obj's underlying member method code with example usage: obj.nclasses() and returns: len