DexSkill: Skill Segmentation Using Haptic Data for Learning Autonomous Long-Horizon Robotic Manipulation Tasks

PAPER WEBSITE:

https://arq-crisp.github.io/DexSkills/

ABSTRACT:

Effective execution of long-horizon tasks with dexterous robotic hands remains a significant challenge in real-world problems. While learning from human demonstrations have shown encouraging results, they require extensive data collection for training. Hence, decomposing long-horizon tasks into reusable primitive skills is a more efficient approach. To achieve so, we developed DexSkills, a novel supervised learning framework that addresses long-horizon dexterous manipulation tasks using primitive skills. DexSkills is trained to recognize and replicate a select set of skills using human demonstration data, which can then segment a demonstrated long-horizon dexterous manipulation task into a sequence of primitive skills to achieve one-shot execution by the robot directly. Significantly, DexSkills operates solely on proprioceptive and tactile data, i.e., haptic data. Our real-world robotic experiments show that DexSkills can accurately segment skills, thereby enabling autonomous robot execution of a diverse range of tasks.

DEMONSTRATION:

The dataset includes data of 20 haptic skils (10 repetitions each):

Skill Number	Skill Name	Skill Number	Skill Name	Skill Number	Skill Name	Skill Number	Skill Name	Skill Number	Skill Name
1	Reach	2	Setup Position	3	PreTouch	4	Touch	5	Flip
6	Wipe Forth	7	Wipe Back	8	PreGrasp	9	Grasp	10	Lift with Grasp
11	Transport Forward	12	Place	13	PreRotate	14	Rotate	15	Shake Up
16	Shake Down	17	Twist	18	Vertical Place	19	Pour	20	Release

And 20 Long Tasks executed as a sequence of skills.

Task	I	II	III	IV	V	VI	VII	VIII	IX	X
A (s)	1	5	3	4	7	6	8	9	10	20
B (t)	4	7	8	9	10	11	12	2
C (b)	13	14	10	15	16	17	18
D (s)	6	7	6	7	6	7
E (b)	5	8	9	10	15	19
F (b)	8	9	10	17
G (b)	1	5	8	9
H (t)	15	16	15	12
I (s)	16	15	16	20
J (b)	9	10	17	20
K (t)	4	8	9
L (s)	13	14	17
M (s)	9	20	2
N (s)	17	10	16
O (b)	10	17	19
P (t)	19	17	18
Q (s)	5	8	2
R (b)	1	13	2
S (s)	18	10	20
T (b)	10	17	18

DATASET:

The dataset provides the following modalities:

• Proprioception
• Tactile Sensing

The dataset files are organised as following:

DexSkill_dataset
    └─ dataset / Long-horizon task dataset
         └── data_0.pt
         └── ...
         └── data_i.pt
         │   ├── state_input
         │   ├── state_output
         │   ├── feature_input
         │   ├── feature_output
         │   ├── label
    

There are 60 dataset files for the training, each consisting of a batch size of 256 with data shuffled. The dataset is saved in a dictionary style.

• data['state_input'] contains the raw haptic data, including the end-effector state, filtered tactile information, filtered contact indicators, and the AH joint state.
• data['feature_input'] includes proposed features while excluding the raw haptic data.
• data['state_output'] and data['features_output'] is the proposed feature at the next timestep, which is used to train the auto-regressive autoencoder.
• data['label'] includes the skill name for the recorded task.

The .pt files located within the /DexSkill_dataset/dataset directory encompass a comprehensive collection of recorded demonstrations across 20 primitive skills. Additionally, within the /DexSkill_dataset/LH_dataset folder, each .pt file correspond to a specific long-horizon manipulation task, with no shuffling involved to preserve the time-series sequence of these tasks.

All trained policies, including those of our framework and comparative works, are inside the trained_policy folder. Furthermore, the json_file within this dataset provides human-labeled task segmentation for all long-horizon tasks, serving as a ground truth.

The demo code for load the dataset and train the classifier is in the file /code/train_classifier.py

VIDEO AND DEMO:

Task.B.Decluttering.Passata.mp4

longhorizondemoB480.mp4