code: def sem(self, world):
      def f1(P):
          def f2(Q):
              return len(list(filter(Q, filter(P, world)))) == 0
  
          return f2
  
      return f1
  
imports: import argparse
  import collections
  import torch
  from search_inference import BestFirstSearch, HashingMarginal, memoize
  import pyro
  import pyro.distributions
label_desc: Use image node_id 1 for calling the NoneMeaning obj's underlying member method code with example usage: obj.sem(world) and returns: f1, f2, unknown