Search Results for author: Chenwei Wu

Found 11 papers, 6 papers with code

No Spurious Local Minima in a Two Hidden Unit ReLU Network

no code implementations ICLR 2018 Chenwei Wu, Jiajun Luo, Jason D. Lee

Deep learning models can be efficiently optimized via stochastic gradient descent, but there is little theoretical evidence to support this.

Vocal Bursts Valence Prediction

Guarantees for Tuning the Step Size using a Learning-to-Learn Approach

1 code implementation30 Jun 2020 Xiang Wang, Shuai Yuan, Chenwei Wu, Rong Ge

Solving this problem using a learning-to-learn approach -- using meta-gradient descent on a meta-objective based on the trajectory that the optimizer generates -- was recently shown to be effective.

Secure Data Sharing With Flow Model

1 code implementation24 Sep 2020 Chenwei Wu, Chenzhuang Du, Yang Yuan

In the classical multi-party computation setting, multiple parties jointly compute a function without revealing their own input data.

BIG-bench Machine Learning Image Classification +1

Dissecting Hessian: Understanding Common Structure of Hessian in Neural Networks

no code implementations8 Oct 2020 Yikai Wu, Xingyu Zhu, Chenwei Wu, Annie Wang, Rong Ge

We can analyze the properties of these smaller matrices and prove the structure of top eigenspace random 2-layer networks.

Generalization Bounds

Beyond Lazy Training for Over-parameterized Tensor Decomposition

no code implementations NeurIPS 2020 Xiang Wang, Chenwei Wu, Jason D. Lee, Tengyu Ma, Rong Ge

We show that in a lazy training regime (similar to the NTK regime for neural networks) one needs at least $m = \Omega(d^{l-1})$, while a variant of gradient descent can find an approximate tensor when $m = O^*(r^{2. 5l}\log d)$.

Tensor Decomposition

Towards Understanding the Data Dependency of Mixup-style Training

1 code implementation ICLR 2022 Muthu Chidambaram, Xiang Wang, Yuzheng Hu, Chenwei Wu, Rong Ge

Despite seeing very few true data points during training, models trained using Mixup seem to still minimize the original empirical risk and exhibit better generalization and robustness on various tasks when compared to standard training.

Provably Learning Diverse Features in Multi-View Data with Midpoint Mixup

1 code implementation24 Oct 2022 Muthu Chidambaram, Xiang Wang, Chenwei Wu, Rong Ge

Mixup is a data augmentation technique that relies on training using random convex combinations of data points and their labels.

Data Augmentation Image Classification

Hiding Data Helps: On the Benefits of Masking for Sparse Coding

1 code implementation24 Feb 2023 Muthu Chidambaram, Chenwei Wu, Yu Cheng, Rong Ge

Furthermore, drawing from the growing body of work on self-supervised learning, we propose a novel masking objective for which recovering the ground-truth dictionary is in fact optimal as the signal increases for a large class of data-generating processes.

Dictionary Learning Self-Supervised Learning

BenchMD: A Benchmark for Unified Learning on Medical Images and Sensors

1 code implementation17 Apr 2023 Kathryn Wantlin, Chenwei Wu, Shih-Cheng Huang, Oishi Banerjee, Farah Dadabhoy, Veeral Vipin Mehta, Ryan Wonhee Han, Fang Cao, Raja R. Narayan, Errol Colak, Adewole Adamson, Laura Heacock, Geoffrey H. Tison, Alex Tamkin, Pranav Rajpurkar

Finally, we evaluate performance on out-of-distribution data collected at different hospitals than the training data, representing naturally-occurring distribution shifts that frequently degrade the performance of medical AI models.

Self-Supervised Learning

The Role of Linguistic Priors in Measuring Compositional Generalization of Vision-Language Models

no code implementations4 Oct 2023 Chenwei Wu, Li Erran Li, Stefano Ermon, Patrick Haffner, Rong Ge, Zaiwei Zhang

Compositionality is a common property in many modalities including natural languages and images, but the compositional generalization of multi-modal models is not well-understood.

DF-DM: A foundational process model for multimodal data fusion in the artificial intelligence era

no code implementations18 Apr 2024 David Restrepo, Chenwei Wu, Constanza Vásquez-Venegas, Luis Filipe Nakayama, Leo Anthony Celi, Diego M López

In the big data era, integrating diverse data modalities poses significant challenges, particularly in complex fields like healthcare.

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