code: def set_item(self,item):
          "For inference, will briefly replace the dataset with one that only contains `item`."
          self.item = self.x.process_one(item)
          yield None
          self.item = Nonf set_item(self,item):
          "For inference, will briefly replace the dataset with one that only contains `item`."
          self.item = self.x.process_one(item)
          yield None
          self.item = None
docs: For inference, will briefly replace the dataset with one that only contains `item`.