class_docstr: Random mask tokens from src sentence.
code: def _parse_opts(self):
      self.temperature = self.opts.tokenmask_temperature
  
imports: import random
  import numpy
  from onmt.constants import DefaultTokens
  from onmt.transforms import register_transform
  from .transform import Transform, ObservableStats
label_desc: Use image node_id 3 for calling the TokenMaskTransform obj's underlying member method code with example usage: obj._parse_opts() without return types