---
license: other
tags: [meta-reasoning, qwen3_5, condgen]
base_model: HerrHruby/MR_midtrain_9B_v4
---

# MR_midtrain_9B_v4_condgen

`HerrHruby/MR_midtrain_9B_v4` with the vision tower re-keyed from
`model.language_model.visual.*` to `model.visual.*`. **Weights are byte-identical**;
only 333 tensor NAMES change.

## Why

verl's Megatron bridge (mbridge) resolves the tower by literal key name and fails
on the released layout with

```
KeyError: 'model.visual.patch_embed.proj.weight'
```

transformers 5.5.4 and vLLM both load either layout — they resolve through the HF
module tree — so the released repo is fine for inference and unusable for
Megatron training. Both v3 artifacts use the flat layout, which is why v3 trained
and v4 did not. This export reconciles against the working v3 export at **0
unmatched keys**.

Use this repo for RL/Megatron training; either repo works for inference.
Regenerate with `meta_reason_rl/e_rl/scripts/fix_v4_condgen_keys.py`.