code: def sanitize(x):
      return np.ascontiguousarray(x, dtype="float32")
  
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 1 for calling a global function with example usage: sanitize(x) and returns: np