code: def convert_to_cpu_index(index):
      if "Gpu" not in str(type(index)):
          return index
      return faiss.index_gpu_to_cpu(index)
  
imports: import numpy
  import torch
  from ..distances import BatchedDistance, CosineSimilarity
  from .None import common_functions
label_desc: Use image node_id 3 for calling a global function with example usage: convert_to_cpu_index(index) and returns: faiss, index