class_docstr: Calculates BLEU score using the Moses multi-bleu.perl script.
    
class_docstr_tok: ["Calculates","BLEU","score","using","the","Moses","multi-bleu.perl","script","."]
code: def default_params():
      params = TextMetricSpec.default_params()
      params.update(
          {
              "rouge_type": "",
          }
      )
      return params
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from __future__ import unicode_literals
  from pydoc import locate
  import abc
  import numpy
  import six
  import tensorflow
  from tensorflow.contrib import metrics
  from tensorflow.contrib.learn import MetricSpec
  from seq2seq.data import postproc
  from seq2seq.configurable import Configurable
  from seq2seq.metrics import rouge
  from seq2seq.metrics import bleu
label_desc: Use image node_id 2 for calling the RougeMetricSpec obj's underlying member method code with example usage: obj.default_params() and returns: params