tinyml implement in nrf52840

Hi,

Most user friendly way would be to use Edge Impulse, they have a platform that is up to date and a active forum as well. 

As for documents from us at Nordic there is not much, we some posts here:

(+) Audio Recognition using Edge Impulse Machine Learning on the nRF52840 DK - Blogs - Nordic Blog - Nordic DevZone (nordicsemi.com)

(+) Where can I find the presentation used in the "Powering the next generation of IoT with Embedded Machine Learning" webinar? - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)

Blog post: (+) TensorFlow and nRF - Blogs - Nordic Blog - Nordic DevZone (nordicsemi.com)

(+) Running Edge Impulse on nRF52840 in a custom board. - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)

Nordic Semiconductor and Edge Impulse bring accessible Machine Learning to cellular IoT solutions - nordicsemi.com

Tiny machine learning now more accessible for developers (nordicsemi.com)

Check out this Devzone post on the same topic: (+) TensorFlow Lite Micro support for machine learning - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)

Regards,
Jonathan

Also, you can check this: https://forum.edgeimpulse.com/t/deploy-edge-impulse-to-nrf52832-via-nrf5-sdk/3024