Google has posted a blog explaining the way AI, or machine learning, tasks are processed on the new Pixel 3 models. Instead of sending user data to its servers for processing, most tasks are now processed by the device itself, preserving user privacy.
https://www.notebookcheck.net/Pixel-3-uses-onboard-AI-processing-to-preserve-privacy-and-deliver-new-features.338760.0.html