Amazon Lex のアイコン

Amazon Lex Specialized2016年〜

A service for building conversational interfaces using voice and text

About 2 min read

What It Does

Amazon Lex is a service for building conversational interfaces for chatbots and voice bots. Using the same natural language understanding (NLU) and automatic speech recognition (ASR) technology as Alexa, it understands user intent and returns appropriate responses.

Use Cases

Used for customer support chatbots, call center interactive voice response (IVR), internal help desk bots, and conversational interfaces for reservation systems.

Everyday Analogy

Think of it like a restaurant receptionist. They understand the customer's (user's) requests like 'I'd like to make a reservation' or 'I'd like to see the menu' (intent), gather the necessary information (date, party size), and take the appropriate action (process the reservation).

What Is Lex?

Amazon Lex is a service for building conversational AI. You define intents (user goals), slots (required information), and fulfillment (processing) for a bot, and it collects information through dialogue with users and executes processing via Lambda functions. It supports both text and voice.

Intents and Slots

An intent is the goal a user wants to achieve (e.g., 'Book a hotel'). Slots are the information needed to fulfill the intent (check-in date, number of nights, room type). Lex collects slot values through conversation with the user, and once all slots are filled, it executes the fulfillment (Lambda function). For practical know-how on intents and slots, related books (Amazon) are also a great learning resource.

Getting Started

Create a bot in the Lex console and define intents and slots. Test the conversation in the test window to verify behavior. Integrate with Amazon Connect for a call center voice bot, or embed it in a website for a chatbot.

Things to Watch Out For

  • Pricing differs between text requests and voice requests. Voice requests have a higher unit price
  • The free tier includes 10,000 text requests and 5,000 voice requests per month for 12 months
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