class_docstr: a pre-processor is either a faiss.VectorTransform or an IndentPreproc
class_docstr_tok: ["a","pre-processor","is","either","a","faiss.VectorTransform","or","an","IndentPreproc"]
code: def __init__(self, d):
      self.d_in = self.d_out = d
  
imports: from __future__ import print_function
  import numpy
  import time
  import os
  import sys
  import faiss
  import re
  from multiprocessing.pool import ThreadPool
  from datasets import ivecs_read
label_desc: Use image node_id 1 to create a new IdentPreproc object  with example: obj = IdentPreproc(d)