Search Results for author: Brian Williams

Found 21 papers, 3 papers with code

Iterated Piecewise Affine (IPA) Approximation for Language Modeling

no code implementations21 Jun 2023 Davood Shamsi, Wen-Yu Hua, Brian Williams

In this work, we demonstrate the application of a first-order Taylor expansion to approximate a generic function $F: R^{n \times m} \to R^{n \times m}$ and utilize it in language modeling.

Language Modelling

Convex Risk Bounded Continuous-Time Trajectory Planning and Tube Design in Uncertain Nonconvex Environments

1 code implementation26 May 2023 Ashkan Jasour, Weiqiao Han, Brian Williams

To address the risk bounded trajectory planning problem, we leverage the notion of risk contours to transform the risk bounded planning problem into a deterministic optimization problem.

Trajectory Planning

LACoS-BLOOM: Low-rank Adaptation with Contrastive objective on 8 bits Siamese-BLOOM

no code implementations10 May 2023 Wen-Yu Hua, Brian Williams, Davood Shamsi

Third, we apply a Siamese architecture on BLOOM model with a contrastive objective to ease the multi-lingual labeled data scarcity.

Language Modelling Large Language Model +5

Non-Gaussian Uncertainty Minimization Based Control of Stochastic Nonlinear Robotic Systems

no code implementations2 Mar 2023 Weiqiao Han, Ashkan Jasour, Brian Williams

In particular, in the provided optimization problem, we use moments and characteristic functions to propagate uncertainties throughout the nonlinear motion model of robotic systems.

Karyotype AI for Precision Oncology

no code implementations20 Nov 2022 Zahra Shamsi, Drew Bryant, Jacob Wilson, Xiaoyu Qu, Avinava Dubey, Konik Kothari, Mostafa Dehghani, Mariya Chavarha, Valerii Likhosherstov, Brian Williams, Michael Frumkin, Fred Appelbaum, Krzysztof Choromanski, Ali Bashir, Min Fang

These individual chromosomes were used to train and assess deep learning models for classifying the 24 human chromosomes and identifying chromosomal aberrations.

Few-Shot Learning Inductive Bias

Providing Insights for Open-Response Surveys via End-to-End Context-Aware Clustering

no code implementations2 Mar 2022 Soheil Esmaeilzadeh, Brian Williams, Davood Shamsi, Onar Vikingstad

When analyzing surveys with open-ended textual responses, it is extremely time-consuming, labor-intensive, and difficult to manually process all the responses into an insightful and comprehensive report.

Clustering Language Modelling

Risk Conditioned Neural Motion Planning

1 code implementation4 Aug 2021 Xin Huang, Meng Feng, Ashkan Jasour, Guy Rosman, Brian Williams

In this paper, we propose an extension of soft actor critic model to estimate the execution risk of a plan through a risk critic and produce risk-bounded policies efficiently by adding an extra risk term in the loss function of the policy network.

Motion Planning

Automatic Curricula via Expert Demonstrations

no code implementations16 Jun 2021 Siyu Dai, Andreas Hofmann, Brian Williams

We propose Automatic Curricula via Expert Demonstrations (ACED), a reinforcement learning (RL) approach that combines the ideas of imitation learning and curriculum learning in order to solve challenging robotic manipulation tasks with sparse reward functions.

Imitation Learning Reinforcement Learning (RL)

Optimal Mixed Discrete-Continuous Planningfor Linear Hybrid Systems

no code implementations16 Feb 2021 Jingkai Chen, Brian Williams, Chuchu Fan

Planning in hybrid systems with both discrete and continuous control variables is important for dealing with real-world applications such as extra-planetary exploration and multi-vehicle transportation systems.

Continuous Control Robotics Systems and Control Systems and Control

DAG-GPs: Learning Directed Acyclic Graph Structure For Multi-Output Gaussian Processes

no code implementations1 Jan 2021 Benjamin J. Ayton, Brian Williams

We introduce the DAG-GP model, which linearly combines latent Gaussian processes so that MOGP outputs follow a directed acyclic graph structure.

Gaussian Processes

Scalable and Safe Multi-Agent Motion Planning with Nonlinear Dynamics and Bounded Disturbances

no code implementations16 Dec 2020 Jingkai Chen, Jiaoyang Li, Chuchu Fan, Brian Williams

We present a scalable and effective multi-agent safe motion planner that enables a group of agents to move to their desired locations while avoiding collisions with obstacles and other agents, with the presence of rich obstacles, high-dimensional, nonlinear, nonholonomic dynamics, actuation limits, and disturbances.

Motion Planning Robotics Multiagent Systems

An Empowerment-based Solution to Robotic Manipulation Tasks with Sparse Rewards

no code implementations15 Oct 2020 Siyu Dai, Wei Xu, Andreas Hofmann, Brian Williams

In order to provide adaptive and user-friendly solutions to robotic manipulation, it is important that the agent can learn to accomplish tasks even if they are only provided with very sparse instruction signals.

reinforcement-learning Reinforcement Learning (RL)

Fast Risk Assessment for Autonomous Vehicles Using Learned Models of Agent Futures

1 code implementation27 May 2020 Allen Wang, Xin Huang, Ashkan Jasour, Brian Williams

The presented methods address a wide range of representations for uncertain predictions including both Gaussian and non-Gaussian mixture models for predictions of both agent positions and controls.

Autonomous Vehicles Position

Moment State Dynamical Systems for Nonlinear Chance-Constrained Motion Planning

no code implementations23 Mar 2020 Allen Wang, Ashkan Jasour, Brian Williams

Chance-constrained motion planning requires uncertainty in dynamics to be propagated into uncertainty in state.

Motion Planning

Efficiently Exploring Ordering Problems through Conflict-directed Search

no code implementations15 Apr 2019 Jingkai Chen, Cheng Fang, David Wang, Andrew Wang, Brian Williams

In this paper, we present Conflict-directed Incremental Total Ordering (CDITO), a conflict-directed search method to incrementally and systematically generate event total orders given ordering relations and conflicts returned by sub-solvers.

Benchmarking Scheduling

Complexity Bounds for the Controllability of Temporal Networks with Conditions, Disjunctions, and Uncertainty

no code implementations8 Jan 2019 Nikhil Bhargava, Brian Williams

In temporal planning, many different temporal network formalisms are used to model real world situations.

Time Resource Networks

no code implementations9 Feb 2016 Szymon Sidor, Peng Yu, Cheng Fang, Brian Williams

The problem of scheduling under resource constraints is widely applicable.

Management Scheduling

Drake: An Efficient Executive for Temporal Plans with Choice

no code implementations18 Jan 2014 Patrick Raymond Conrad, Brian Williams

We benchmark Drakes performance on random structured problems, and find that Drake reduces the size of the compiled representation by a factor of over 500 for large problems, while incurring only a modest increase in run-time latency, compared to prior work in compiled executives for temporal plans with discrete choices.

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