message: Update beam_search_decoder.py
  probably not the neatest way to update my previous pull request...
diff: @@ -921,6 +921,7 @@ def _get_scores(log_probs, sequence_lengths, length_penalty_weight,
  """
  length_penalty_ = _length_penalty(
  sequence_lengths=sequence_lengths, penalty_factor=length_penalty_weight)
  + length_penalty_ = math_ops.cast(length_penalty_, dtype=log_probs.dtype)
  scores = log_probs / length_penalty_
  coverage_penalty_weight = ops.convert_to_tensor(
  