Developer builds on-device AI model that autocompletes piano music in real time

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A developer has trained a 125-million-parameter transformer model designed to autocomplete piano performances in real time. Similar in concept to code-completion tools like GitHub Copilot, the model takes a few notes played on a MIDI piano as input and continues the musical phrase. The system runs entirely on-device, achieving approximately 108 notes per second on an iPhone 15. The app is currently available for free, and the creator has offered to answer questions about the model architecture, training process, and Core ML implementation.

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