code: def __init__(self, **kwargs):
      super().__init__(**kwargs)
      self.ps = PorterStemmer()
  
imports: from nboost.plugins import Plugin
  from nboost.delegates import ResponseDelegate
  from nboost.database import DatabaseRow
  import numpy
  from multiprocessing import Pool, cpu_count
  import math
  from nltk.stem import PorterStemmer
  from nltk.tokenize import word_tokenize
  from nltk.corpus import stopwords
  import nltk
label_desc: Use image node_id 1 to create a new PrerankPlugin object from inherited base classes: Plugin with example: obj = PrerankPlugin()