Rasa3.X 多轮对话中Slots的重置

原贴链接 https://github.com/RasaHQ/rasa/issues/3105

应用情形：在现有的Form填槽的过程中检测到新的意图，采用暴力覆盖原有Form的slots，并开始新意图的Form

假设现有意图包括：ask_route, ask_price, ask_train_time。
在rules.yml中添加处理新意图的规则

version: "3.0"
rules:
  - rule: repeat ask route during route form
    condition:
      - active_loop: route_form
    steps:
      - intent: ask_route
      - action: utter_test_success
      - action: action_slot_reset  # for test
      - action: action_restarted   # for test
      
  - rule: repeat ask price during route form
    condition:
      - active_loop: route_form
    steps:
      - intent: ask_price
      - action: utter_test_success
      - action: action_slot_reset  # for test
      - action: action_restarted  # for test

  - rule: repeat ask train time during route form
    condition:
      - active_loop: route_form
    steps:
      - intent: ask_train_time
      - action: utter_test_success
      - action: action_slot_reset  # for test
      - action: action_restarted  # for test

在actions.py中添加对应reset和restart的action

# for test
class ActionRestarted(Action):  
    def name(self):         
        return 'action_restarted'   
    def run(self, dispatcher, tracker, domain): 
        return[Restarted()] 
    
class ActionSlotReset(Action):  
    def name(self):         
        return 'action_slot_reset'  
    def run(self, dispatcher, tracker, domain):         
         #获得nlu数据（意图和词槽数据）
        content = tracker.latest_message
        intent = content['intent']['name']
        dispatcher.utter_message("{} ".format(intent))
        if intent == 'ask_route':
            return [AllSlotsReset(), Form("route_form")]
        elif intent == 'ask_price':
            return [AllSlotsReset(), Form("price_form")]
        elif intent == 'ask_train_time':
            return [AllSlotsReset(), Form("train_time_form")]
        else:
            return [AllSlotsReset()]