code: def imbalance_factor(k, assign):
      assign = np.ascontiguousarray(assign, dtype="int64")
      return faiss.imbalance_factor(
          len(assign), k, faiss.swig_ptr(assign)
      )
  
imports: import numpy
  import faiss
  import time
  from multiprocessing.pool import ThreadPool
label_desc: Use image node_id 6 for calling a global function with example usage: imbalance_factor(k, assign) and returns: faiss