class_docstr: A dataset that is not completely random but still challenging to
  index
class_docstr_tok: ["A","dataset","that","is","not","completely","random","but","still","challenging","to","index"]
code: def get_queries(self):
      return self.xq
  
imports: import os
  import numpy
  import faiss
  from .vecs_io import fvecs_read, ivecs_read, bvecs_mmap, fvecs_mmap
  from .exhaustive_search import knn
label_desc: Use image node_id 2 for calling the SyntheticDataset obj's underlying member method code with example usage: obj.get_queries() and returns: self