Search Results for author: Litian Liang

Found 8 papers, 1 papers with code

A Quantitative Approach for Evaluating Disease Focus and Interpretability of Deep Learning Models for Alzheimer's Disease Classification

no code implementations7 Sep 2024 Thomas Yu CHow Tam, Litian Liang, Ke Chen, Haohan Wang, Wei Wu

To bridge such gap, in this study, we developed a quantitative disease-focusing strategy to first enhance the interpretability of DL models using saliency maps and brain segmentations; then we propose a disease-focus (DF) score that quantifies how much a DL model focuses on brain areas relevant to AD pathology based on clinically known MRI-based pathological regions of AD.

Data Augmentation

Robo360: A 3D Omnispective Multi-Material Robotic Manipulation Dataset

no code implementations9 Dec 2023 Litian Liang, Liuyu Bian, Caiwei Xiao, Jialin Zhang, Linghao Chen, Isabella Liu, Fanbo Xiang, Zhiao Huang, Hao Su

Building robots that can automate labor-intensive tasks has long been the core motivation behind the advancements in computer vision and the robotics community.

Representation Learning

Reparameterized Policy Learning for Multimodal Trajectory Optimization

no code implementations20 Jul 2023 Zhiao Huang, Litian Liang, Zhan Ling, Xuanlin Li, Chuang Gan, Hao Su

We then present a practical model-based RL method, called Reparameterized Policy Gradient (RPG), which leverages the multimodal policy parameterization and learned world model to achieve strong exploration capabilities and high data efficiency.

Reinforcement Learning (RL)

Reducing Variance in Temporal-Difference Value Estimation via Ensemble of Deep Networks

1 code implementation16 Sep 2022 Litian Liang, Yaosheng Xu, Stephen Mcaleer, Dailin Hu, Alexander Ihler, Pieter Abbeel, Roy Fox

On a set of 26 benchmark Atari environments, MeanQ outperforms all tested baselines, including the best available baseline, SUNRISE, at 100K interaction steps in 16/26 environments, and by 68% on average.

Target Entropy Annealing for Discrete Soft Actor-Critic

no code implementations6 Dec 2021 Yaosheng Xu, Dailin Hu, Litian Liang, Stephen Mcaleer, Pieter Abbeel, Roy Fox

Soft Actor-Critic (SAC) is considered the state-of-the-art algorithm in continuous action space settings.

Atari Games Scheduling

Temporal-Difference Value Estimation via Uncertainty-Guided Soft Updates

no code implementations28 Oct 2021 Litian Liang, Yaosheng Xu, Stephen Mcaleer, Dailin Hu, Alexander Ihler, Pieter Abbeel, Roy Fox

Under the belief that $\beta$ is closely related to the (state dependent) model uncertainty, Entropy Regularized Q-Learning (EQL) further introduces a principled scheduling of $\beta$ by maintaining a collection of the model parameters that characterizes model uncertainty.

Q-Learning Scheduling

Modular Framework for Visuomotor Language Grounding

no code implementations5 Sep 2021 Kolby Nottingham, Litian Liang, Daeyun Shin, Charless C. Fowlkes, Roy Fox, Sameer Singh

Natural language instruction following tasks serve as a valuable test-bed for grounded language and robotics research.

Instruction Following

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