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Apple's machine learning team published an all-new research paper today that dives deep into how Apple uses AI to power one of the most basic Siri commands. In order to keep the'Hey Siri' command from running on the main processor all day, Apple's new publication reveals that the company uses a tiny, low-power auxiliary processor that's embedded in the Motion Coprocessor just to listen to the phrase. In the paper published on its blog today, Apple also discusses how it found unique ways to use machine learning to prevent false triggers of the'Hey Siri' command. To detect when someone actually wants to trigger Siri, Apple converts your voice using a Deep Neural Network into a probability distribution over speech sounds. A confidence score is then created and if it's high enough, Siri wakes up.