# 2026-04-06 LEWM ViT Transfer Notes

## Root-cause fix

The first LEWM runs were stopped because the data path still resized each camera view to `224x224` **before** multiview fusion. That preserved the final tensor shape but broke the original LEWM geometry.

Corrected path now is:

- **Training dataset**: keep stored per-view `256x256` images (`data.image_resize_shape=null` at launch; dataset instantiate override is `None` for LEWM)
- **Eval rollout input**: resize live MuJoCo `480x640` camera images to `256x256` per view
- **Backbone**: fuse `front, top, r_vis` on the LEWM axis, then resize fused short side to `224`

## Verification

- Local tests passed (`38 passed` across the focused suite)
- Remote check:
  - dataset sample image shape: `(2, 3, 256, 256)`
  - eval-prepared live frame shape: `(3, 256, 256)`
- Remote smoke passed with real checkpoint:
  - `smoke-lewm-imf-rawpath-emb384-20260406-002002`

## Current runs

- `lewm-vit-imf-raw256fix-sim-transfer-emb384-l12-ph16-ex08-step50k-roll10-5880g0-20260406-002124`
- `lewm-vit-imf-raw256fix-sim-transfer-emb256-l12-ph16-ex08-step50k-roll10-5880g1-20260406-002124`