code: def perturb_sentence(present, n, prob_change=0.5):
      raw = np.zeros((n, len(self.words)), "|U80")
      data = np.ones((n, len(self.words)))
  
imports: from .None import utils
  from .None import anchor_base
  from .None import anchor_explanation
  import numpy
  import json
  import os
  import string
  import sys
  from io import open
  import numpy
label_desc: Use image node_id 4 for calling the SentencePerturber obj's underlying member method code with example usage: obj.perturb_sentence(present, n, prob_change) without return types