code: def lookup(self, keys):
      (n,) = keys.shape
      vals = np.empty((n,), dtype="int64")
      faiss.hashtable_int64_to_int64_lookup(
          self.log2_capacity,
          swig_ptr(self.tab),
          n,
          swig_ptr(keys),
          swig_ptr(vals),
      )
      return vals
  
imports: import numpy
  from faiss.loader import *
  import faiss
  import collections.abc
label_desc: Use image node_id 3 for calling the MapInt64ToInt64 obj's underlying member method code with example usage: obj.lookup(keys) and returns: vals