What is the primary function of Amazon Lex?

The primary function of Amazon Lex is to create chatbots based on intents and entities. Amazon Lex is a service that provides advanced natural language processing capabilities, allowing developers to build conversational interfaces into applications. By defining intents, which represent the goals of the users, and entities, which correspond to the specific details that users provide, developers can train the models to understand and respond to user inputs effectively. This allows businesses to create sophisticated chatbots that can interact with users in a natural manner, mimicking human-like conversations.

While other options present features related to natural language processing and data analysis, they do not align with Amazon Lex's core purpose. For instance, converting spoken language into text is primarily handled by services like Amazon Transcribe, which is focused on speech recognition. Analyzing data sets visually is a function of services such as Amazon QuickSight, which is used for data visualization and insights. Optimizing machine learning parameters is typically associated with services that manage model training processes, such as Amazon SageMaker.