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Alvin Wan

9 accepted papers

2025

Representation Bending for Large Language Model Safety

ACL 2025long

Large Language Models (LLMs) have emerged as powerful tools, but their inherent safety risks – ranging from harmful content generation to broader societal harms – pose significant challenges. These risks can be amplified by the recent adversarial attacks, fine-tuning vulnerabilities, and the increas…

2023

AutoFocusFormer: Image Segmentation off the Grid

CVPR 2023poster

Real world images often have highly imbalanced content density. Some areas are very uniform, e.g., large patches of blue sky, while other areas are scattered with many small objects. Yet, the commonly used successive grid downsampling strategy in convolutional deep networks treats all areas equally.…

2023

UPSCALE: Unconstrained Channel Pruning

ICML 2023poster

As neural networks grow in size and complexity, inference speeds decline. To combat this, one of the most effective compression techniques -- channel pruning -- removes channels from weights. However, for multi-branch segments of a model, channel removal can introduce inference-time memory copies. I…

2021

FBNetV3: Joint Architecture-Recipe Search Using Predictor Pretraining

CVPR 2021poster

Neural Architecture Search (NAS) yields state-of-the-art neural networks that outperform their best manually-designed counterparts. However, previous NAS methods search for architectures under one set of training hyper-parameters (i.e., a training recipe), overlooking superior architecture-recipe co…

Cited by 133PDFScholar
2021

NBDT: Neural-Backed Decision Tree

ICLR 2021poster

Machine learning applications such as finance and medicine demand accurate and justifiable predictions, barring most deep learning methods from use. In response, previous work combines decision trees with deep learning, yielding models that (1) sacrifice interpretability for accuracy or (2) sacrific…

2021

Visual Transformers: Where Do Transformers Really Belong in Vision Models?

ICCV 2021poster

A recent trend in computer vision is to replace convolutions with transformers. However, the performance gain of transformers is attained at a steep cost, requiring GPU years and hundreds of millions of samples for training. This excessive resource usage compensates for a misuse of transformers: Tra…

Cited by 32PDFScholar
2020

FBNetV2: Differentiable Neural Architecture Search for Spatial and Channel Dimensions

CVPR 2020poster

Differentiable Neural Architecture Search (DNAS) has demonstrated great success in designing state-of-the-art, efficient neural networks. However, DARTS-based DNAS's search space is small when compared to other search methods', since all candidate network layers must be explicitly instantiated in me…

Cited by 383PDFcodeScholar
2018

Shift: A Zero FLOP, Zero Parameter Alternative to Spatial Convolutions

CVPR 2018poster

Neural networks rely on convolutions to aggregate spatial information. However, spatial convolutions are expensive in terms of model size and computation, both of which grow quadratically with respect to kernel size. In this paper, we present a parameter-free, FLOP-free "shift" operation as an alter…

Cited by 494SourcePDFScholar
2018

SqueezeSeg: Convolutional Neural Nets with Recurrent CRF for Real-Time Road-Object Segmentation from 3D LiDAR Point Cloud

ICRA 2018poster

We address semantic segmentation of road-objects from 3D LiDAR point clouds. In particular, we wish to detect and categorize instances of interest, such as cars, pedestrians and cyclists. We formulate this problem as a point-wise classification problem, and propose an end-to-end pipeline called Sque…

Cited by 1173SourceScholar