Amazon Lex Cheat Sheet

• A service that can help you build conversational interfaces using voice and text.
• Uses automatic speech recognition (ASR) to convert speech to text.
• Uses natural language understanding (NLU) for recognizing the intent of the text.
• Provides highly-engaging user experiences and lifelike conversational interactions.
• Gets more intelligent over time by using deep learning.

Common Use Cases

• AI Chatbots
• Informational bots
• Enterprise Productivity bots
• Voice Assistants

Concepts

• Bots
  • Performs automated tasks such as ordering food or booking flights.
  • Supports multiple intents – for example, a bot can book a reservation or may choose to cancel it.

• Intent
  • A set of actions given to a bot by a user.
  • Intent name
    • A description for the intent (e.g. ‘BookFlights’, ‘OrderFood’)
  • Sample utterances
    • Describes the tone of the intent.
  • How to fulfill the intent
    • Describes the method of fulfilling an intent.
    • Deeply integrates with AWS Lambda to fulfill the intent.
• Slot
  • An optional parameter is used as a part of the intent configuration.
  • Slot type
    • You can create a custom or built-in slot type.
    • Each slot type should have a unique name within an AWS account.

Amazon Lex Pricing

• Pay-as-you-go payment model
• $0.004 per voice request
• $0.00075 per text request

Note: If you are studying for the AWS Certified Machine Learning Specialty exam, we highly recommend that you take our AWS Certified Machine Learning – Specialty Practice Exams and read our Machine Learning Specialty exam study guide.

Amazon Lex Cheat Sheet References:

https://aws.amazon.com/lex/faqs/
https://docs.aws.amazon.com/lex/latest/dg/how-it-works.html
https://aws.amazon.com/lex/pricing/