[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, we talked a lot, it went quiet for a while, then picked up again. That whole arc is in there.

Because the content is what it is, nothing left my machine: everything ran locally on my DGX Spark.

What I used: my home AI box (DGX Spark) + a Japanese sentiment model (for tone) + a bigger local model (to guess events from numbers).