Search Results for author: Linfeng Zhao

Found 11 papers, 2 papers with code

Practice Makes Perfect: Planning to Learn Skill Parameter Policies

no code implementations22 Feb 2024 Nishanth Kumar, Tom Silver, Willie McClinton, Linfeng Zhao, Stephen Proulx, Tomás Lozano-Pérez, Leslie Pack Kaelbling, Jennifer Barry

We consider a setting where a robot is initially equipped with (1) a library of parameterized skills, (2) an AI planner for sequencing together the skills given a goal, and (3) a very general prior distribution for selecting skill parameters.

Active Learning Decision Making

Can Euclidean Symmetry be Leveraged in Reinforcement Learning and Planning?

no code implementations17 Jul 2023 Linfeng Zhao, Owen Howell, Jung Yeon Park, Xupeng Zhu, Robin Walters, Lawson L. S. Wong

In robotic tasks, changes in reference frames typically do not influence the underlying physical properties of the system, which has been known as invariance of physical laws. These changes, which preserve distance, encompass isometric transformations such as translations, rotations, and reflections, collectively known as the Euclidean group.

reinforcement-learning

Equivariant Single View Pose Prediction Via Induced and Restricted Representations

no code implementations7 Jul 2023 Owen Howell, David Klee, Ondrej Biza, Linfeng Zhao, Robin Walters

We show that an algorithm that learns a three-dimensional representation of the world from two dimensional images must satisfy certain geometric consistency properties which we formulate as SO(2)-equivariance constraints.

Pose Estimation Pose Prediction

Scaling up and Stabilizing Differentiable Planning with Implicit Differentiation

no code implementations24 Oct 2022 Linfeng Zhao, Huazhe Xu, Lawson L. S. Wong

To alleviate this issue, we propose to differentiate through the Bellman fixed-point equation to decouple forward and backward passes for Value Iteration Network and its variants, which enables constant backward cost (in planning horizon) and flexible forward budget and helps scale up to large tasks.

Visual Navigation

Learning Symmetric Embeddings for Equivariant World Models

1 code implementation24 Apr 2022 Jung Yeon Park, Ondrej Biza, Linfeng Zhao, Jan Willem van de Meent, Robin Walters

Incorporating symmetries can lead to highly data-efficient and generalizable models by defining equivalence classes of data samples related by transformations.

Learning Symmetric Representations for Equivariant World Models

no code implementations29 Sep 2021 Jung Yeon Park, Ondrej Biza, Linfeng Zhao, Jan-Willem van de Meent, Robin Walters

In this paper, we use equivariant transition models as an inductive bias to learn symmetric latent representations in a self-supervised manner.

Inductive Bias

Model-based Navigation in Environments with Novel Layouts Using Abstract $2$-D Maps

no code implementations1 Jan 2021 Linfeng Zhao, Lawson L. S. Wong

To learn this ability, we need to efficiently train an agent on environments with a small proportion of training maps and share knowledge effectively across the environments.

Decision Making

Deep Imitation Learning for Bimanual Robotic Manipulation

1 code implementation NeurIPS 2020 Fan Xie, Alexander Chowdhury, M. Clara De Paolis Kaluza, Linfeng Zhao, Lawson L. S. Wong, Rose Yu

Compared to baselines, our model generalizes better and achieves higher success rates on several simulated bimanual robotic manipulation tasks.

Imitation Learning

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