class_docstr: Transforms an input by replacing its number word
  exmaple:
  {
      hypothesis: Mr Zhang has more than 20 students in Fudan university.
      premise: Mr Zhang has 10 students in Fudan university.
      y: contradicition
  }
code: def __init__(self):
      super().__init__()
  
file_path: textflint/textflint/generation/transformation/NLI/num_word.py
imports: from ..transformation import Transformation
  from ....common.utils.num_word import _get_contradictory_hypothesis
label_desc: Use image node_id 1 to create a new NumWord object from inherited base classes: Transformation with example: obj = NumWord()