code: def __init__(self, M):
      import faiss
  
      self.index = faiss.IndexFlatL2(M.shape[1])
      self.index.add(M.astype("float32"))
  
file_path: pygraphistry/graphistry/ai_utils.py
imports: import pandas
  import numpy
  import graphistry
  from .constants import DISTANCE, WEIGHT, BATCH
  from logging import getLogger
label_desc: Use image node_id 1 to create a new FaissVectorSearch object  with example: obj = FaissVectorSearch(M)