Search Results for author: Joseph J. Lim

Found 38 papers, 12 papers with code

Task-Induced Representation Learning

no code implementations ICLR 2022 Jun Yamada, Karl Pertsch, Anisha Gunjal, Joseph J. Lim

We investigate the effectiveness of unsupervised and task-induced representation learning approaches on four visually complex environments, from Distracting DMControl to the CARLA driving simulator.

Contrastive Learning Decision Making +2

Adversarial Skill Chaining for Long-Horizon Robot Manipulation via Terminal State Regularization

no code implementations15 Nov 2021 Youngwoon Lee, Joseph J. Lim, Anima Anandkumar, Yuke Zhu

However, these approaches require larger state distributions to be covered as more policies are sequenced, and thus are limited to short skill sequences.

Distilling Motion Planner Augmented Policies into Visual Control Policies for Robot Manipulation

1 code implementation11 Nov 2021 I-Chun Arthur Liu, Shagun Uppal, Gaurav S. Sukhatme, Joseph J. Lim, Peter Englert, Youngwoon Lee

Learning complex manipulation tasks in realistic, obstructed environments is a challenging problem due to hard exploration in the presence of obstacles and high-dimensional visual observations.

Imitation Learning Motion Planning +1

Learning to Synthesize Programs as Interpretable and Generalizable Policies

1 code implementation NeurIPS 2021 Dweep Trivedi, Jesse Zhang, Shao-Hua Sun, Joseph J. Lim

To alleviate the difficulty of learning to compose programs to induce the desired agent behavior from scratch, we propose to first learn a program embedding space that continuously parameterizes diverse behaviors in an unsupervised manner and then search over the learned program embedding space to yield a program that maximizes the return for a given task.

Program Synthesis

Demonstration-Guided Reinforcement Learning with Learned Skills

no code implementations ICLR Workshop SSL-RL 2021 Karl Pertsch, Youngwoon Lee, Yue Wu, Joseph J. Lim

Prior approaches for demonstration-guided RL treat every new task as an independent learning problem and attempt to follow the provided demonstrations step-by-step, akin to a human trying to imitate a completely unseen behavior by following the demonstrator's exact muscle movements.


Policy Transfer across Visual and Dynamics Domain Gaps via Iterative Grounding

1 code implementation1 Jul 2021 Grace Zhang, Linghan Zhong, Youngwoon Lee, Joseph J. Lim

In this paper, we propose a novel policy transfer method with iterative "environment grounding", IDAPT, that alternates between (1) directly minimizing both visual and dynamics domain gaps by grounding the source environment in the target environment domains, and (2) training a policy on the grounded source environment.

Message Passing Adaptive Resonance Theory for Online Active Semi-supervised Learning

no code implementations2 Dec 2020 Taehyeong Kim, Injune Hwang, Hyundo Lee, Hyunseo Kim, Won-Seok Choi, Joseph J. Lim, Byoung-Tak Zhang

Active learning is widely used to reduce labeling effort and training time by repeatedly querying only the most beneficial samples from unlabeled data.

Active Learning

Generalization to New Actions in Reinforcement Learning

2 code implementations ICML 2020 Ayush Jain, Andrew Szot, Joseph J. Lim

A fundamental trait of intelligence is the ability to achieve goals in the face of novel circumstances, such as making decisions from new action choices.


Motion Planner Augmented Reinforcement Learning for Robot Manipulation in Obstructed Environments

no code implementations22 Oct 2020 Jun Yamada, Youngwoon Lee, Gautam Salhotra, Karl Pertsch, Max Pflueger, Gaurav S. Sukhatme, Joseph J. Lim, Peter Englert

In contrast, motion planners use explicit models of the agent and environment to plan collision-free paths to faraway goals, but suffer from inaccurate models in tasks that require contacts with the environment.


Accelerating Reinforcement Learning with Learned Skill Priors

1 code implementation22 Oct 2020 Karl Pertsch, Youngwoon Lee, Joseph J. Lim

We validate our approach, SPiRL (Skill-Prior RL), on complex navigation and robotic manipulation tasks and show that learned skill priors are essential for effective skill transfer from rich datasets.


Learning to Coordinate Manipulation Skills via Skill Behavior Diversification

1 code implementation ICLR 2020 Youngwoon Lee, Jingyun Yang, Joseph J. Lim

When mastering a complex manipulation task, humans often decompose the task into sub-skills of their body parts, practice the sub-skills independently, and then execute the sub-skills together.

Program Guided Agent

no code implementations ICLR 2020 Shao-Hua Sun, Te-Lin Wu, Joseph J. Lim

Developing agents that can learn to follow natural language instructions has been an emerging research direction.

IKEA Furniture Assembly Environment for Long-Horizon Complex Manipulation Tasks

1 code implementation17 Nov 2019 Youngwoon Lee, Edward S. Hu, Zhengyu Yang, Alex Yin, Joseph J. Lim

The IKEA Furniture Assembly Environment is one of the first benchmarks for testing and accelerating the automation of complex manipulation tasks.

Industrial Robots reinforcement-learning +1

Multimodal Model-Agnostic Meta-Learning via Task-Aware Modulation

2 code implementations NeurIPS 2019 Risto Vuorio, Shao-Hua Sun, Hexiang Hu, Joseph J. Lim

Model-agnostic meta-learners aim to acquire meta-learned parameters from similar tasks to adapt to novel tasks from the same distribution with few gradient updates.

Few-Shot Image Classification General Classification +1

Generalizing Reinforcement Learning to Unseen Actions

no code implementations25 Sep 2019 Ayush Jain*, Andrew Szot*, Jincheng Zhou, Joseph J. Lim

Hence, we propose a framework to enable generalization over both these aspects: understanding an action’s functionality, and using actions to solve tasks through reinforcement learning.

Decision Making reinforcement-learning +1

Keyframing the Future: Discovering Temporal Hierarchy with Keyframe-Inpainter Prediction

no code implementations25 Sep 2019 Karl Pertsch, Oleh Rybkin, Jingyun Yang, Konstantinos G. Derpanis, Kostas Daniilidis, Joseph J. Lim, Andrew Jaegle

To flexibly and efficiently reason about temporal sequences, abstract representations that compactly represent the important information in the sequence are needed.

Toward Multimodal Model-Agnostic Meta-Learning

no code implementations18 Dec 2018 Risto Vuorio, Shao-Hua Sun, Hexiang Hu, Joseph J. Lim

One important limitation of such frameworks is that they seek a common initialization shared across the entire task distribution, substantially limiting the diversity of the task distributions that they are able to learn from.

Few-Shot Image Classification Meta-Learning

Simulator Predictive Control: Using Learned Task Representations and MPC for Zero-Shot Generalization and Sequencing

1 code implementation4 Oct 2018 Zhanpeng He, Ryan Julian, Eric Heiden, Hejia Zhang, Stefan Schaal, Joseph J. Lim, Gaurav Sukhatme, Karol Hausman

We complete unseen tasks by choosing new sequences of skill latents to control the robot using MPC, where our MPC model is composed of the pre-trained skill policy executed in the simulation environment, run in parallel with the real robot.

Auto-conditioned Recurrent Mixture Density Networks for Learning Generalizable Robot Skills

no code implementations29 Sep 2018 Hejia Zhang, Eric Heiden, Stefanos Nikolaidis, Joseph J. Lim, Gaurav S. Sukhatme

Personal robots assisting humans must perform complex manipulation tasks that are typically difficult to specify in traditional motion planning pipelines, where multiple objectives must be met and the high-level context be taken into consideration.

Motion Planning

Model-Agnostic Meta-Learning for Multimodal Task Distributions

no code implementations27 Sep 2018 Risto Vuorio, Shao-Hua Sun, Hexiang Hu, Joseph J. Lim

In this paper, we augment MAML with the capability to identify tasks sampled from a multimodal task distribution and adapt quickly through gradient updates.

Few-Shot Image Classification Meta-Learning

Scaling simulation-to-real transfer by learning composable robot skills

1 code implementation26 Sep 2018 Ryan Julian, Eric Heiden, Zhanpeng He, Hejia Zhang, Stefan Schaal, Joseph J. Lim, Gaurav Sukhatme, Karol Hausman

In particular, we first use simulation to jointly learn a policy for a set of low-level skills, and a "skill embedding" parameterization which can be used to compose them.

Demo2Vec: Reasoning Object Affordances From Online Videos

no code implementations CVPR 2018 Kuan Fang, Te-Lin Wu, Daniel Yang, Silvio Savarese, Joseph J. Lim

Watching expert demonstrations is an important way for humans and robots to reason about affordances of unseen objects.

3D Interpreter Networks for Viewer-Centered Wireframe Modeling

no code implementations3 Apr 2018 Jiajun Wu, Tianfan Xue, Joseph J. Lim, Yuandong Tian, Joshua B. Tenenbaum, Antonio Torralba, William T. Freeman

3D-INN is trained on real images to estimate 2D keypoint heatmaps from an input image; it then predicts 3D object structure from heatmaps using knowledge learned from synthetic 3D shapes.

Image Retrieval Keypoint Estimation

Unsupervised Visual-Linguistic Reference Resolution in Instructional Videos

no code implementations CVPR 2017 De-An Huang, Joseph J. Lim, Li Fei-Fei, Juan Carlos Niebles

We propose an unsupervised method for reference resolution in instructional videos, where the goal is to temporally link an entity (e. g., "dressing") to the action (e. g., "mix yogurt") that produced it.

Referring Expression

Target-driven Visual Navigation in Indoor Scenes using Deep Reinforcement Learning

2 code implementations16 Sep 2016 Yuke Zhu, Roozbeh Mottaghi, Eric Kolve, Joseph J. Lim, Abhinav Gupta, Li Fei-Fei, Ali Farhadi

To address the second issue, we propose AI2-THOR framework, which provides an environment with high-quality 3D scenes and physics engine.

3D Reconstruction Feature Engineering +2

Single Image 3D Interpreter Network

no code implementations29 Apr 2016 Jiajun Wu, Tianfan Xue, Joseph J. Lim, Yuandong Tian, Joshua B. Tenenbaum, Antonio Torralba, William T. Freeman

In this work, we propose 3D INterpreter Network (3D-INN), an end-to-end framework which sequentially estimates 2D keypoint heatmaps and 3D object structure, trained on both real 2D-annotated images and synthetic 3D data.

Image Retrieval Keypoint Estimation

Galileo: Perceiving Physical Object Properties by Integrating a Physics Engine with Deep Learning

no code implementations NeurIPS 2015 Jiajun Wu, Ilker Yildirim, Joseph J. Lim, Bill Freeman, Josh Tenenbaum

Humans demonstrate remarkable abilities to predict physical events in dynamic scenes, and to infer the physical properties of objects from static images.

Scene Understanding

Discovering States and Transformations in Image Collections

no code implementations CVPR 2015 Phillip Isola, Joseph J. Lim, Edward H. Adelson

Our system works by generalizing across object classes: states and transformations learned on one set of objects are used to interpret the image collection for an entirely new object class.

Looking Beyond the Visible Scene

no code implementations CVPR 2014 Aditya Khosla, Byoungkwon An An, Joseph J. Lim, Antonio Torralba

In this work, we propose to look beyond the visible elements of a scene; we demonstrate that a scene is not just a collection of objects and their configuration or the labels assigned to its pixels - it is so much more.

Scene Understanding

Sketch Tokens: A Learned Mid-level Representation for Contour and Object Detection

no code implementations CVPR 2013 Joseph J. Lim, C. L. Zitnick, Piotr Dollar

Our features, called sketch tokens, are learned using supervised mid-level information in the form of hand drawn contours in images.

Contour Detection object-detection +1

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