[Day 9] A local Japanese sentiment AI (BERT) read 8 years of a LINE chat, and the ups and downs surfaced from numbers alone

Intro Day 9. Today is less about model internals and more of a personal experiment: have a local AI analyze the entire chat history with one LINE friend. (LINE is the dominant messaging app in Japan.) When I exported it, 8 years were sitting there — from the very first message to today. It started,