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LLaRA: Supercharging Robot Learning Data for Vision-Language Policy
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LLaRA converts behavior-cloning trajectories into conversation-style instruction data with image-coordinate actions and adds six self-supervised auxiliary datasets to finetune LLaVA-1.5-7B into a robot policy.
Problem
Adapting pretrained vision-language models into robot action policies is hard when robot demonstration data is limited, and conversation-style instruction data for robotics is under-explored.
Approach
Formulate robot actions as text with 2D image coordinates (normalized to [0,1]) inside visual instruction-tuning conversations, and enhance the data with six auxiliary self-supervised instruction datasets (localization, detection, action/future prediction, spatial and temporal relations) derived from existing trajectories without extra action labels.
Key results
- In the real world with finetuning on xArm-Det, D-inBC + Aux (C) + OD reaches 91.6% average success... more precisely, the xArm-Action finetuned variant reaches 91.6% average success versus 31.6% for GPT-4o in zero-shot.
- Compared to VIMA's most capable released model (trained on 660k trajectories), LLaRA's best model is reported to perform better while using about 12% of the expert trajectories and only the front view.
- Auxiliary datasets give large gains when training data is limited, e.g. real-world finetuning on xArm-Det rises from 0% (inBC) to 88.3% with Aux (D).
Measured effects reported in the paper
| What was changed | Where | Measured | Effect |
|---|---|---|---|
| Use conversation-style inBC instead of RT-2 Style action tokens | LLaRA robot policy · VIMA-Bench simulation | success rate | Helped |
| Add object-detection descriptions for reference images (D-inBC) | LLaRA · VIMA-Bench simulation | success rate | Helped |
| Add auxiliary instruction-tuning datasets | LLaRA · VIMA-0.8k and VIMA-8k | success rate | Helped |
| Add auxiliary instruction-tuning datasets | LLaRA D-inBC · VIMA-80k | success rate | Mixed |
| Add Aux (D) to inBC (ablation) | LLaRA · Real-world zero-shot, average success rate (%) | average success rate (%): 36.6 -> 16.6 | Hurt |
| Add Aux (D) to inBC (ablation) | LLaRA · Real-world finetuning on xArm-Det, average success rate (%) | average success rate (%): 0 -> 88.3 | Helped |
| Add Aux (C) to D-inBC with object detection (ablation) | LLaRA · Real-world finetuning on xArm-Action, average success rate (%) | average success rate (%): 60 -> 91.6 | Helped |
| Add Aux (C) to D-inBC with object detection (ablation) | LLaRA · Real-world joint training on xArm-Det, average success rate (%) | average success rate (%): 68.3 -> 83.3 | Helped |
| Replace structured reference-image coordinates with natural-language descriptions (ablation) | D-inBC + Aux (D) · VIMA-8k L1/L2/L3 | success rate (%): 62.3 -> 61.9; 57.7 -> 54.2; 52.1 -> 55.4 | Mixed |
| Replace structured reference-image coordinates with natural-language descriptions (ablation) | D-inBC + Aux (D) · Real-world xArm-Det and xArm-Action | average success rate (%): 88.3 -> 75; 75 -> 80 | Mixed |
Surprising findings
- RT-2 Style baselines scored 0% in all real-world settings, including with VIMA-660k pretraining, showing that token-based action outputs struggle with limited data.
- Auxiliary data gains diminish or even hurt when the BC dataset is large (VIMA-80k) and in zero-shot real-world evaluation, where aux data caused overfitting to the VIMA domain.
Limitations
- Real-world evaluation uses only 20 episodes per setting and a single robot arm with a fixed camera and linear calibration mapping.
- Auxiliary data can hurt performance in zero-shot settings and when the BC dataset is large, requiring careful tuning of its amount.
- Only single-image inputs are used; multiple reference images are converted to text via object detection.
Experimental setup
Datasets: VIMA-Bench (VIMA dataset subsets) xArm-Det xArm-Action Instruct-BC (inBC) Description-Instruct-BC (D-inBC) auxiliary datasets (localization, detection, action prediction, future prediction, spatial relationship, temporal relati
Benchmarks: VIMA-Bench (L1-L3) real-world xArm tasks T1-T3 real-world generalization tasks with distractors and unseen T4
Metrics: success rate
Baselines: RT-2 Style VIMA GPT-4o OpenVLA
Builds on: LLaVA RT-2 VIMA-Bench OWLv2
Closest papers by meaning
- FineVLA: Fine-Grained Instruction Alignment for Steerable Vision-Language-Action Policies (NeurIPS 2026 · similarity 0.91)
- Beyond Data Scaling: Representation-Centric Pre-training for Vision-Language-Action Models (NeurIPS 2026 · similarity 0.91)
- NS-VLA: Towards Neuro-Symbolic Vision-Language-Action Models (NeurIPS 2026 · similarity 0.90)
- ElegantVLA: Learning When to Think for Efficient Vision-Language-Action Models (NeurIPS 2026 · similarity 0.90)
- VLAS: Vision-Language-Action Model with Speech Instructions for Customized Robot Manipulation (ICLR 2025 · similarity 0.90)
- PriorVLA: Prior-Preserving Adaptation for Vision-Language-Action Models (NeurIPS 2026 · similarity 0.90)
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