## How to Make Your Own JEV Model from an Open LLM Turn a small open-source Qwen LLM into a fast, single-pass text classifier by swapping its language-modeling head ## What is JEV, and where and why you need it Imagine you are building a robot to sort mail. You give it a set of simple rules: if the envelope is small, put it in the "letters" bin; if the envelope is large, put it in the "packages" bin. This is how traditional computer programming works. It relies on exact, rigid rules that humans write, usually in the form of "if-then" statements. However, the world is messy, and a lot of…