open-world AR world-model checkpoints

Autoregressive (block-causal) video world models for robot manipulation, built on the Wan2.1-T2V-1.3B DiT backbone. Use them with the open-world repo for open-loop trajectory replay, policy evaluation, and interactive SpaceMouse teleoperation.

Each model is a self-contained folder: the weights, the inference config that reproduces the geometry the checkpoint was trained with, and its action-normalization stats.

wm_student_2view/
├── wm_student_2view.pt     # ARWorldModel state_dict
├── inference_config.py     # get_args() -> ARWMArgs  (canonical config)
└── stats.json              # train-set action percentiles (7-d)

Available models

Both are undistilled students: sample with the many-step (32) preview schedule, and do not pass --distilled.

wm_student_2view

A DROID world model at 192×320, 2 height-stacked views. Actions are absolute 7-d cartesian EEF poses (xyz + Euler-XYZ + gripper) injected per-frame (cross_attn_aligned), with fully-causal single-frame blocks and 4 frames of history. Plain 16-channel latent input — no geometric conditioning, so no geometry sidecar is needed at inference.

Supports trajectory replay, policy evaluation, and teleoperation.

This is an undistilled student: it needs the 32-step sampler. Its inference_config.py sets stage="student_init", which is what selects that schedule — do not pass --distilled (that few-step deployment schedule is for a distilled checkpoint and produces a blurry colour-wash here). Few-step (2/4-step) distilled releases are planned; they will be separate entries in the table above.

wm_student_3view_bimanual

The TRI bimanual platform at 192×320, 3 height-stacked views (scene + 2 wrists), 20-d cartesian absolute actions, and a 16-d aux state head. This is a camera_cond model: patch_embedding.weight is (1536, 25, 1, 2, 2) — 16 latent + 9 geometry channels (3 trajectory band + 6 camera ray-map) — so it is not loadable with a 16-channel config, and geometry inputs must be supplied at inference.

Two caveats today:

• Its inference_config.py is still the older constants-style file (NUM_CAMS = 3, …) rather than a get_args() -> ARWMArgs factory, so passing the model name to the repo does not work yet — only wm_student_2view resolves by name. Use an explicit --config configs/inference/ar_wan_student_3view_bimanual.py with a downloaded checkpoint path.
• Trajectory replay only. Policy evaluation and teleoperation go through a rollout path that has no camera_cond support (it allocates 16-channel latents and passes no geometry), and expects a 7-d DROID state rather than this model's 20-d bimanual vector.

Usage

The repo resolves a model name to this folder and downloads what it needs, so you do not have to manage paths or keep a config in sync:

# open-loop trajectory replay
python scripts/replay_ar.py \
    --config wm_student_2view --checkpoint wm_student_2view \
    --latent-root <droid_latents> --split val

# policy evaluation (pi0.5 closed-loop inside the world model)
uv run python scripts/run_evaluation.py --config configs/evaluation/teleop_ar_pi05.yaml

# interactive teleoperation
python scripts/interactive_ar.py --config wm_student_2view --checkpoint wm_student_2view

To fetch a whole model folder directly instead:

hf download tennyyyin/open-world-ar-wm --include 'wm_student_2view/*' \
    --local-dir checkpoints/ar_wm
# the bimanual model must be fetched this way (it does not resolve by name yet):
hf download tennyyyin/open-world-ar-wm --include 'wm_student_3view_bimanual/*' \
    --local-dir checkpoints/ar_wm

See the repo docs: docs/MODELS.md, docs/EVAL.md, docs/TRAJECTORY_REPLAY.md, docs/TELEOPERATION.md.