Model Card for ACT for AlohaTransferCube
Action Chunking Transformer Policy (as per Learning Fine-Grained Bimanual Manipulation with Low-Cost Hardware) trained for the AlohaTransferCube environment from gym-aloha.
How to Get Started with the Model
See the LeRobot library (particularly the evaluation script) for instructions on how to load and evaluate this model.
Training Details
Trained with LeRobot@d747195
The model was trained using LeRobot's training script and with the aloha_sim_transfer_cube_human dataset.
Here are the loss and evaluation success rate (with 50 rollouts) during training.
Evaluation
The model was evaluated on the AlohaTransferCube environment from gym-aloha and compared to a similar model trained with the original ACT repository. Each episode marks a success if the cube is successfully picked by one robot arm and transferred to the other robot arm.
Here are the success rate results for 500 episodes worth of evaluation. The first row is the naive mean. The second row assumes a uniform prior and computes the beta posterior, then calculates the mean and lower/upper confidence bounds (with a 68.2% confidence interval centered on the mean).
| Ours | Theirs | |
|---|---|---|
| Success rate for 500 episodes (%) | 87.6 | 68.0 |
| Beta distribution lower/mean/upper (%) | 86.0 / 87.5 / 88.9 | 65.8 / 67.9 / 70.0 |
The original code was heavily refactored, and some bugs were spotted along the way. The differences in code may account for the difference in success rate. Another possibility is that our simulation environment may use slightly different heuristics to evaluate success (we've observed that success is registered as soon as the second arm's gripper makes antipodal contact with the cube). Finally, one should observe that the in-training evaluation jumps up towards the end of training. This may need further investigation (Is it statistically significant? If so, what is the cause?).