Search Results for author: Ran Liu

Found 18 papers, 9 papers with code

Balanced Data, Imbalanced Spectra: Unveiling Class Disparities with Spectral Imbalance

no code implementations18 Feb 2024 Chiraag Kaushik, Ran Liu, Chi-Heng Lin, Amrit Khera, Matthew Y Jin, Wenrui Ma, Vidya Muthukumar, Eva L Dyer

Classification models are expected to perform equally well for different classes, yet in practice, there are often large gaps in their performance.

Data Augmentation

Frequency-Aware Masked Autoencoders for Multimodal Pretraining on Biosignals

1 code implementation12 Sep 2023 Ran Liu, Ellen L. Zippi, Hadi Pouransari, Chris Sandino, Jingping Nie, Hanlin Goh, Erdrin Azemi, Ali Moin

To achieve effective pretraining in the presence of potential distributional shifts, we propose a frequency-aware masked autoencoder ($\texttt{bio}$FAME) that learns to parameterize the representation of biosignals in the frequency space.

LatentDR: Improving Model Generalization Through Sample-Aware Latent Degradation and Restoration

1 code implementation28 Aug 2023 Ran Liu, Sahil Khose, Jingyun Xiao, Lakshmi Sathidevi, Keerthan Ramnath, Zsolt Kira, Eva L. Dyer

To address this challenge, we propose a novel approach for distribution-aware latent augmentation that leverages the relationships across samples to guide the augmentation procedure.

Domain Generalization

A Feature Set of Small Size for the PDF Malware Detection

no code implementations9 Aug 2023 Ran Liu, Charles Nicholas

Machine learning (ML)-based malware detection systems are becoming increasingly important as malware threats increase and get more sophisticated.

feature selection Malware Detection

Can Feature Engineering Help Quantum Machine Learning for Malware Detection?

no code implementations3 May 2023 Ran Liu, Maksim Eren, Charles Nicholas

With the increasing number and sophistication of malware attacks, malware detection systems based on machine learning (ML) grow in importance.

Feature Engineering feature selection +2

MTNeuro: A Benchmark for Evaluating Representations of Brain Structure Across Multiple Levels of Abstraction

1 code implementation1 Jan 2023 Jorge Quesada, Lakshmi Sathidevi, Ran Liu, Nauman Ahad, Joy M. Jackson, Mehdi Azabou, Jingyun Xiao, Christopher Liding, Matthew Jin, Carolina Urzay, William Gray-Roncal, Erik C. Johnson, Eva L. Dyer

To bridge this gap, we introduce a new dataset, annotations, and multiple downstream tasks that provide diverse ways to readout information about brain structure and architecture from the same image.

Attribute Semantic Segmentation

Clustering and Analysis of GPS Trajectory Data using Distance-based Features

no code implementations1 Dec 2022 Zann Koh, Yuren Zhou, Billy Pik Lik Lau, Ran Liu, Keng Hua Chong, Chau Yuen

We propose a new mobility metric, Daily Characteristic Distance, and use it to generate features for each user together with Origin-Destination matrix features.

Clustering

Seeing the forest and the tree: Building representations of both individual and collective dynamics with transformers

1 code implementation10 Jun 2022 Ran Liu, Mehdi Azabou, Max Dabagia, Jingyun Xiao, Eva L. Dyer

By enabling flexible pre-training that can be transferred to neural recordings of different size and order, our work provides a first step towards creating a foundation model for neural decoding.

Time Series Time Series Analysis

"Good Robot! Now Watch This!": Repurposing Reinforcement Learning for Task-to-Task Transfer

1 code implementation Conference On Robot Learning (CoRL) 2021 Andrew Hundt, Aditya Murali, Priyanka Hubli, Ran Liu, Nakul Gopalan, Matthew Gombolay, Gregory D. Hager

Based upon this insight, we propose See-SPOT-Run (SSR), a new computational approach to robot learning that enables a robot to complete a variety of real robot tasks in novel problem domains without task-specific training.

Few-Shot Learning Meta Reinforcement Learning +3

Dual Band GNSS Antenna Phase Center Characterization for Automotive Applications

no code implementations5 Nov 2021 Ran Liu, Daniel N. Aloi

In this paper, a low-cost small size dual-band ceramic GNSS patch antenna is presented from design to real sample.

Position

Drop, Swap, and Generate: A Self-Supervised Approach for Generating Neural Activity

1 code implementation NeurIPS 2021 Ran Liu, Mehdi Azabou, Max Dabagia, Chi-Heng Lin, Mohammad Gheshlaghi Azar, Keith B. Hengen, Michal Valko, Eva L. Dyer

Our approach combines a generative modeling framework with an instance-specific alignment loss that tries to maximize the representational similarity between transformed views of the input (brain state).

Relative Localization of Mobile Robots with Multiple Ultra-WideBand Ranging Measurements

no code implementations19 Jul 2021 Zhiqiang Cao, Ran Liu, Chau Yuen, Achala Athukorala, Benny Kai Kiat Ng, Muraleetharan Mathanraj, U-Xuan Tan

We propose an approach to estimate the relative pose between a group of robots by equipping each robot with multiple UWB ranging nodes.

Pose Tracking

Offline reinforcement learning with uncertainty for treatment strategies in sepsis

no code implementations9 Jul 2021 Ran Liu, Joseph L. Greenstein, James C. Fackler, Jules Bergmann, Melania M. Bembea, Raimond L. Winslow

Guideline-based treatment for sepsis and septic shock is difficult because sepsis is a disparate range of life-threatening organ dysfunctions whose pathophysiology is not fully understood.

reinforcement-learning Reinforcement Learning (RL)

Understand and Improve Contrastive Learning Methods for Visual Representation: A Review

no code implementations6 Jun 2021 Ran Liu

Traditional supervised learning methods are hitting a bottleneck because of their dependency on expensive manually labeled data and their weaknesses such as limited generalization ability and vulnerability to adversarial attacks.

Contrastive Learning Self-Supervised Learning

WiFi Fingerprint Clustering for Urban Mobility Analysis

no code implementations4 May 2021 Sumudu HasalaMarakkalage, Billy Pik Lik Lau, Yuren Zhou, Ran Liu, Chau Yuen, Wei Quin Yow, Keng Hua Chong

We propose a system architecture to scan the surrounding WiFi AP, and perform unsupervised learning to demonstrate that it is possible to identify three major insights, namely the indoor POI within a building, neighbourhood activity, and micro-mobility of the users.

Clustering

A Physiology-Driven Computational Model for Post-Cardiac Arrest Outcome Prediction

1 code implementation9 Feb 2020 Han B. Kim, Hieu Nguyen, Qingchu Jin, Sharmila Tamby, Tatiana Gelaf Romer, Eric Sung, Ran Liu, Joseph Greenstein, Jose I. Suarez, Christian Storm, Raimond Winslow, Robert D. Stevens

Combined EHR-PTS24 models had higher discrimination (area under the receiver operating characteristic curve [AUC]) than models which used either EHR or PTS24 alone, for the prediction of survival (AUC 0. 85, 0. 80 and 0. 68 respectively) and neurological outcome (0. 87, 0. 83 and 0. 78).

Time Series Analysis

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