MLP on Qwen 4B mimicking Jev
X post: a builder reports a small MLP on top of Qwen 4B already reproduces Jev-like decision behaviour.
This summary is based on how curated lists describe the project; its README was not available to review.
Overview
This is a post on X in which a builder reports that training a small MLP on top of Qwen 4B hidden states already reproduces Jev-like decision behaviour. It belongs to a wider set of community experiments showing that a frozen open model plus a light head can approximate a hosted decision model.
No thread text beyond the list summary was available, so the training data, evaluation and accuracy are unknown. It is mainly a pointer for researchers exploring head-training approaches.
What the decision model decides
| Type | Question | Answers |
|---|---|---|
| Choice | Pick one option from Qwen 4B hidden states via a small MLP (inferred)(inferred) | — |
How it works
- Run Qwen 4B over state and question.
- Feed hidden states to a small MLP head.
- Compare outputs with Jev's decisions.
Strengths
- Suggests Jev-like behaviour is reachable with a small trained head.
Caveats
- Social post only; no code, data or metrics in the sources.
At a glance
- Type
- Discussion
- Status
- discussion
Use cases and integrations
How curated lists describe it
X: builder reports that a small MLP trained on top of Qwen 4B already reproduces Jev-like decision behaviour.
yibie/awesome-jev
Frequently asked questions
What is claimed?
That a small MLP on Qwen 4B reproduces Jev-like decisions.
Is there code?
None is referenced in the sources.
Are there numbers?
Not in the available summary.
Related projects
Auto-generated write-up of a Reddit post claiming an open RLCD-trained Jev model; content is generic and largely inaccurate.
ProjectPythonHacker News thread on Decision Index 0.2.1, which compared about 70 open reproductions of Jev's decision model.
DiscussiondiscussionChinese X post rounding up five promising open Jev replicas: Laya 421M, Decider-2B, NanoJev 0.6B, Reflex and System-One 4B.
DiscussiondiscussionShow HN thread announcing an open-source decision model that its authors claim beats TypeSafe Jev.
DiscussiondiscussionHacker News thread about an open-source Jev alternative built on Qwen-2.5-1B with RLCD training.
DiscussiondiscussionList of System One decision models, open implementations, agents, tools, SDKs, baselines and benchmarks, with a sortable web version.
Projectproduction