class_docstr: Calculates smoothing coefficient for each language.
code: def __init__(self, smoothing_exponent):
      self._smoothing_exponent = smoothing_exponent
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
  import apache_beam
  import tensorflow.compat.v1
  from tensorflow_text.python.ops.bert_tokenizer import BertTokenizer
  from tensorflow_text.python.ops.wordpiece_tokenizer import WordpieceTokenizer
  from tensorflow_text.tools.wordpiece_vocab import wordpiece_tokenizer_learner_lib
label_desc: Use image node_id 1 to create a new CalculateCoefficients object from inherited base classes: beam with example: obj = CalculateCoefficients(smoothing_exponent)