code: def __init__(self, *args, **kwargs):
      super().__init__()
      self.perturb_strategy = "omit_text"
  
imports: import numpy
  from abc import ABC, abstractmethod
  from .text_utils import extract_non_overlapping_ngrams
label_desc: Use image node_id 1 to create a new RemovalPerturbation object from inherited base classes: PerturbationModelBase with example: obj = RemovalPerturbation()