code: def load(cls, serialised):
          
          pipeline = cls()
          for fn_name in serialised:
              try:
                  fn = cls.registered_functions[fn_name]
              except KeyError:
                  raise BaseLunrException(
                      "Cannot load unregistered function ".format(fn_name)
                  )
              else:
                  pipeline.add(fn)
  
          return pipeline
docs: Loads a previously serialised pipeline.