如何从零开始,使用rasa构建一个chatbot?

自己的笔记,只是写给自己偶尔复习一下rasa的。只有我自己能看懂这篇含糊其辞语焉不详的文章。

如何安装rasa?

参考官方文档:rasa安装

如何初始化一个rasa项目?

rasa init

"Creates a new project with example training data, actions, and config files."——by rasa document

需要自己编写哪些文件?

domain.yml

更多信息请参考官方文档:Domain

The domain defines the universe in which your assistant operates. It specifies the intents, entities, slots, responses, forms, and actions your bot should know about. It also defines a configuration for conversation sessions.

示例:

version: "2.0"

intents:
  - affirm
  - deny
  - greet
  - thankyou
  - goodbye
  - search_concerts
  - search_venues
  - compare_reviews
  - bot_challenge
  - nlu_fallback
  - how_to_get_started

entities:
  - name

slots:
  concerts:
    type: list
    influence_conversation: false
  venues:
    type: list
    influence_conversation: false
  likes_music:
    type: bool
    influence_conversation: true

responses:
  utter_greet:
    - text: "Hey there!"
  utter_goodbye:
    - text: "Goodbye :("
  utter_default:
    - text: "Sorry, I didn't get that, can you rephrase?"
  utter_youarewelcome:
    - text: "You're very welcome."
  utter_iamabot:
    - text: "I am a bot, powered by Rasa."
  utter_get_started:
    - text: "I can help you find concerts and venues. Do you like music?"
  utter_awesome:
    - text: "Awesome! You can ask me things like \"Find me some concerts\" or \"What's a good venue\""

actions:
  - action_search_concerts
  - action_search_venues
  - action_show_concert_reviews
  - action_show_venue_reviews
  - action_set_music_preference

session_config:
  session_expiration_time: 60  # value in minutes
  carry_over_slots_to_new_session: true

  1. intent

In a given user message, the thing that a user is trying to convey or accomplish (e,g., greeting, specifying a location).

示例:

intents:
- greet:
    use_entities:
      - name
      - first_name
    ignore_entities:
      - location
      - age

点我了解intent更多信息

  1. entity

Keywords that can be extracted from a user message. For example: a telephone number, a person's name, a location, the name of a product

示例:

entities:
   - PERSON           
   - time          
   - city:            
       roles:
       - from
       - to
   - topping:         
       groups:
       - 1
       - 2

点我了解entity更多信息

  1. slot

A key-value store that Rasa uses to track information over the course of a conversation.

类型:

  • text
  • bool
  • categorical
  • float
  • list
  • any
  • Custom Slot Types

点我了解slot更多信息

  1. response

A message that an assistant sends to a user. This can include text, buttons, images, and other content.

点我了解response更多信息

  1. form

A type of custom action that asks the user for multiple pieces of information.

示例:

forms:
  restaurant_form:
    required_slots:
        cuisine:
          - type: from_entity
            entity: cuisine
        num_people:
          - type: from_entity
            entity: number

点我了解form更多信息

  1. action

After each user message, the model will predict an action that the assistant should perform next. This page gives you an overview of the different types of actions you can use.

点我了解action更多信息

actions.py

更多信息请参考官方文档:Custom Actions

A custom action can run any code you want, including API calls, database queries etc. They can turn on the lights, add an event to a calendar, check a user's bank balance, or anything else you can imagine.

stories.yml

更多信息请参考官方文档:Stories

Stories are a type of training data used to train your assistant's dialogue management model. Stories can be used to train models that are able to generalize to unseen conversation paths.

rules.yml

更多信息请参考官方文档:Rules

Rules are a type of training data used to train your assistant's dialogue management model. Rules describe short pieces of conversations that should always follow the same path.

nlu.yml

更多信息请参考官方文档:NLU Training Data

NLU training data stores structured information about user messages.

config.yml

更多信息请参考官方文档:Model Configuration

The configuration file defines the components and policies that your model will use to make predictions based on user input.

如何训练?

rasa train

“Trains a model using your NLU data and stories, saves trained model in ./models.”——by rasa document

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