code: def _cmp_models(self, m1, m2):
          
  
          # Don't alter m1/m2 by mistake
          m1 = copy.deepcopy(m1)
          m2 = copy.deepcopy(m2)
  
          # Remove keys added by bravado-core
          def _cleanup(d):
              """Remove all keys in the blacklist"""
              for k in ('x-model', 'x-persist', 'x-scope'):
                  if k in d:
                      del d[k]
              for v in list(d.values()):
                  if isinstance(v, dict):
                      _cleanup(v)
  
          _cleanup(m1)
          _cleanup(m2)
  
          # log.debug("model1:\n" + pprint.pformat(m1))
          # log.debug("model2:\n" + pprint.pformat(m2))
          return not m1 == m2
docs: Compare two models from different swagger APIs and tell if they are
          equal (return 0), or not (return != 0)