code: def get_index(
      embedding_dim: int,
      num_centroids: int,
      num_probe: int,
      num_subquantizers: int,
      bits_per_code: int,
      device: Optional[torch.device] = None,
      # pyre-ignore[11]
  ) -> Union[faiss.GpuIndexIVFPQ, faiss.IndexIVFPQ]:
      """
      returns a FAISS IVFPQ index, placed on the device passed in
  
      Args:
          embedding_dim (int): indexed embedding dimension,
          num_centroids (int): the number of centroids (Voronoi cells),
          num_probe (int): The number of centroids (Voronoi cells) to probe. Must be <= num_centroids. Sweeping powers of 2 for nprobe and picking one of those based on recall statistics (e.g., 1, 2, 4, 8, ..,) is typically done.,
          num_subquantizers (int): the number of subquanitizers in Product Quantization (PQ) compression of subvectors,
          bits_per_code (int): The number of bits for each subvector in Product Quantization (PQ),
  
      Example::
  
          get_index()
  
      """
      if device is not None and device.type == "cuda":
          # pyre-fixme[16]
          res = faiss.StandardGpuResources()
          # pyre-fixme[16]
          config = faiss.GpuIndexIVFPQConfig()
          # pyre-ignore[16]
          index = faiss.GpuIndexIVFPQ(
              res,
              embedding_dim,
              num_centroids,
              num_subquantizers,
              bits_per_code,
              # pyre-fixme[16]
              faiss.METRIC_L2,
              config,
          )
      else:
          # pyre-fixme[16]
          quantizer = faiss.IndexFlatL2(embedding_dim)
          # pyre-fixme[16]
          index = faiss.IndexIVFPQ(
              quantizer,
              embedding_dim,
              num_centroids,
              num_subquantizers,
              bits_per_code,
          )
      index.nprobe = num_probe
      return index
  
imports: from typing import Optional, Union
  import faiss
  import faiss.contrib.torch_utils
  import torch
label_desc: Use image node_id 1 for calling a global function with example usage: get_index(embedding_dim, num_centroids, num_probe, num_subquantizers, bits_per_code, device) and returns: index