code: def evaluate(self):
      self._evaluate(
          self.index_factory_fn,
          self.index_file,
          self.xq_index_file,
          self.nprobe,
      )
  
imports: import faiss
  import numpy
  import os
  from tqdm import tqdm, trange
  import sys
  import logging
  from faiss.contrib.ondisk import merge_ondisk
  from faiss.contrib.big_batch_search import big_batch_search
  from faiss.contrib.exhaustive_search import knn_ground_truth
  from faiss.contrib.evaluation import knn_intersection_measure
  from utils import get_intersection_cardinality_frequencies, margin, is_pretransform_index
  from dataset import create_dataset_from_oivf_config
label_desc: Use image node_id 13 for calling the OfflineIVF obj's underlying member method code with example usage: obj.evaluate() without return types