class_docstr: Sentence level augmentation that uses MarianMTModel to back-translate.
  
  https://huggingface.co/transformers/model_doc/marian.html
class_docstr_tok: ["Sentence","level","augmentation","that","uses","MarianMTModel","to","back-translate",".","https",":","\/\/huggingface.co\/transformers\/model_doc\/marian.html"]
code: def __init__(self, **kwargs):
      from textattack.transformations.sentence_transformations import (
          BackTranslation,
      )
  
      transformation = BackTranslation(chained_back_translation=5)
      super().__init__(transformation, **kwargs)
  
imports: import random
  from textattack.constraints.pre_transformation import RepeatModification, StopwordModification
  from textattack.constraints.semantics.sentence_encoders import UniversalSentenceEncoder
  from .None import Augmenter
label_desc: Use image node_id 1 to create a new BackTranslationAugmenter object from inherited base classes: Augmenter with example: obj = BackTranslationAugmenter()