Filtering with excluded slots

Now you're going to put together some of the ideas from previous exercises in order to allow users to tell your bot about what they do and do not want, split across multiple messages.

The negated_ents() function has already been defined for you. Additionally, a slightly tweaked version of the find_hotels() function, which accepts a neg_params dictionary in addition to a params dictionary, has been defined.

This exercise is part of the course

Building Chatbots in Python

Exercise instructions

Define a respond() function which accepts a message, params, and neg_params as arguments.
Use the negated_ents() function with message and ent_vals as arguments. Store the result in negated.
Use the tweaked find_hotels() function with the params and neg_params dictionaries as arguments to find matching hotels. Store the result in results.
Initialize the params and neg_params dictionaries outside the respond() function and hit 'Submit Answer' to see the bot's responses!

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Define the respond function
def ____:
    # Extract the entities
    entities = interpreter.parse(message)["entities"]
    ent_vals = [e["value"] for e in entities]
    # Look for negated entities
    negated = ____
    for ent in entities:
        if ent["value"] in negated and negated[ent["value"]]:
            neg_params[ent["entity"]] = str(ent["value"])
        else:
            params[ent["entity"]] = str(ent["value"])
    # Find the hotels
    results = ____
    names = [r[0] for r in results]
    n = min(len(results),3)
    # Return the correct response
    return responses[n].format(*names), params, neg_params

# Initialize params and neg_params
params = ____
neg_params = ____

# Pass the messages to the bot
for message in ["I want a cheap hotel", "but not in the north of town"]:
    print("USER: {}".format(message))
    response, params, neg_params = respond(message, params, neg_params)
    print("BOT: {}".format(response))

Edit and Run Code

This exercise is part of the course

Building Chatbots in Python

IntermediateSkill Level

4.7+

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In this chapter, you'll learn how to build your first chatbot. After gaining a bit of historical context, you'll set up a basic structure for receiving text and responding to users, and then learn how to add the basic elements of personality. You'll then build rule-based systems for parsing text.

Exercise 1: Introduction to conversational software Exercise 2: EchoBot I Exercise 3: EchoBot II Exercise 4: Creating a personality Exercise 5: Chitchat Exercise 6: Adding variety Exercise 7: ELIZA I: asking questions Exercise 8: Text processing with regular expressions Exercise 9: ELIZA II: Extracting key phrases Exercise 10: ELIZA III: Pronouns Exercise 11: ELIZA IV: Putting it all together

Here, you'll use machine learning to turn natural language into structured data using spaCy, scikit-learn, and rasa NLU. You'll start with a refresher on the theoretical foundations and then move onto building models using the ATIS dataset, which contains thousands of sentences from real people interacting with a flight booking system.

Exercise 1: Understanding intents and entities Exercise 2: Intent classification with regex I Exercise 3: Intent classification with regex II Exercise 4: Entity extraction with regex Exercise 5: Word vectors Exercise 6: word vectors with spaCy Exercise 7: Intents and classification Exercise 8: Intent classification with sklearn Exercise 9: Entity extraction Exercise 10: Using spaCy's entity recognizer Exercise 11: Assigning roles using spaCy's parser Exercise 12: Robust language understanding with rasa NLU Exercise 13: Rasa NLU Exercise 14: Data-efficient entity recognition

In this chapter, you'll build a personal assistant to help you plan a trip. It will be able to respond to questions like "are there any cheap hotels in the north of town?" by looking inside a hotel’s database for matching results.

Exercise 1: Virtual assistants and accessing data Exercise 2: SQL basics Exercise 3: SQL statements in Python Exercise 4: Exploring a DB with natural language Exercise 5: Creating queries from parameters Exercise 6: Using your custom function to find hotels Exercise 7: Creating SQL from natural language Exercise 8: Incremental slot filling and negation Exercise 9: Refining your search Exercise 10: Basic negation Exercise 11: Filtering with excluded slots

Current Exercise

Everything you've built so far has statelessly mapped intents to actions and responses. It's amazing how far you can get with that! But to build more sophisticated bots you will always want to add some statefulness. That's what you'll do here, as you build a chatbot that helps users order coffee.

Exercise 1: Why statefulness is key Exercise 2: Form filling Exercise 3: Asking contextual questions Exercise 4: Dealing with rejection Exercise 5: Asking questions & queuing answers Exercise 6: Pending actions I Exercise 7: Pending actions II Exercise 8: Pending state transitions Exercise 9: Putting it all together I Exercise 10: Putting it all together II Exercise 11: Frontiers of dialogue research Exercise 12: Generating text with neural networks Exercise 13: Congratulations!