VLA-Adapter-LIBERO-Spatial-5000

VLA-Adapter policy: a Qwen2.5-0.5B prism backbone (fused DINOv2 + SigLIP vision) with a layer-wise Bridge-Attention action head, fine-tuned on LIBERO.

Backbone	qwen25-0_5b-extra
LLM	896 hidden x 24 layers
Vision	vit_large_patch14_reg4_dinov2.lvd142m + vit_so400m_patch14_siglip_224
Image size	224x224
Action head	MLP-ResNet, Bridge Attention (Pro)
Objective	L1 regression over the action chunk
Checkpoint	configs+libero_spatial_no_noops+b16+lr-0.0001+lora-r64+dropout-0.0--image_aug--VLA-Adapter--libero_spatial_no_noops--20260727_221630--5000_chkpt
unnorm_key	libero_spatial_no_noops
Evaluated on	libero_spatial

Component files were renamed to the convention the evaluation loader expects:

• action_head--5000_checkpoint.pt -> action_head--checkpoint.pt
• proprio_projector--5000_checkpoint.pt -> proprio_projector--checkpoint.pt

Evaluating

The evaluation code loads the action head and proprio projector from a local directory, and only accepts a Hub repo id if it is in its hardcoded allowlist, so download the repo first:

hf download Zenma/VLA-Adapter-LIBERO-Spatial-5000 --local-dir ckpts/VLA-Adapter-LIBERO-Spatial-5000

python experiments/robot/libero/run_libero_eval.py \
    --pretrained_checkpoint ckpts/VLA-Adapter-LIBERO-Spatial-5000 \
    --task_suite_name libero_spatial \
    --num_images_in_input 2 \
    --use_proprio True \
    --use_l1_regression True \
    --num_open_loop_steps 8

use_pro_version is inferred from whether the checkpoint path contains "Pro", so keep that substring in the directory name -- this checkpoint is a Pro head.

Loading the VLM alone

from transformers import AutoModelForVision2Seq, AutoProcessor

processor = AutoProcessor.from_pretrained("Zenma/VLA-Adapter-LIBERO-Spatial-5000", trust_remote_code=True)
vla = AutoModelForVision2Seq.from_pretrained("Zenma/VLA-Adapter-LIBERO-Spatial-5000", trust_remote_code=True)

This gives the backbone only. Action prediction additionally needs action_head--checkpoint.pt and proprio_projector--checkpoint.pt from this repo, instantiated as in experiments/robot/openvla_utils.py.