New Frontiers of AI: How Columbia Researchers Are Shaping Ethical and Impactful Innovation
CS researchers were among the experts who considered AI from every angle at the kick-off session of the Columbia AI Summit.
Tag: research
CS@CU At ACL 2024
CS researchers presented their work at the 62nd Annual Meeting of the Association for Computational Linguistics (ACL 2024).
Parallel Structures in Pre-training Data Yield In-Context Learning
Yanda Chen Columbia University, Chen Zhao New York University, Zhou Yu Columbia University, Kathleen McKeown Columbia University, He He New York University
Abstract:
Pre-trained language models (LMs) are capable of in-context learning (ICL): they can adapt to a task with only a few examples given in the prompt without any parameter update. However, it is unclear where this capability comes from as there is a stark distribution shift between pre-training text and ICL prompts. In this work, we study what patterns of the pretraining data contribute to ICL. We find that LMs’ ICL ability depends on parallel structures in the pre-training data—pairs of phrases following similar templates in the same context window. Specifically, we detect parallel structures by checking whether training on one phrase improves prediction of the other, and conduct ablation experiments to study their effect on ICL. We show that removing parallel structures in the pre-training data reduces LMs’ ICL accuracy by 51% (vs 2% from random ablation). This drop persists even when excluding common patterns such as n-gram repetitions and long-range dependency, showing the diversity and generality of parallel structures. A closer look at the detected parallel structures indicates that they cover diverse linguistic tasks and span long distances in the data.
Getting Serious about Humor: Crafting Humor Datasets with Unfunny Large Language Models
Zachary Horvitz Columbia University, Jingru Chen Columbia University, Rahul Aditya Columbia University, Harshvardhan Srivastava Columbia University, Robert West EPFL, Zhou Yu Columbia University, Kathleen McKeown Columbia University
Abstract:
Humor is a fundamental facet of human cognition and interaction. Yet, despite recent advances in natural language processing, humor detection remains a challenging task that is complicated by the scarcity of datasets that pair humorous texts with similar non-humorous counterparts. We investigate whether large language models (LLMs) can generate synthetic data for humor detection via editing texts. We benchmark LLMs on an existing human dataset and show that current LLMs display an impressive ability to “unfun” jokes, as judged by humans and as measured on the downstream task of humor detection. We extend our approach to a code-mixed English-Hindi humor dataset where we find that GPT-4’s synthetic data is highly rated by bilingual annotators and provides challenging adversarial examples for humor classifiers.
ICLEF: In-Context Learning with Expert Feedback for Explainable Style Transfer
Arkadiy Saakyan Columbia University and Smaranda Muresan Columbia University
Abstract:
While state-of-the-art large language models (LLMs) can excel at adapting text from one style to another, current work does not address the explainability of style transfer models. Recent work has explored generating textual explanations from larger teacher models and distilling them into smaller student models. One challenge with such approach is that LLM outputs may contain errors that require expertise to correct, but gathering and incorporating expert feedback is difficult due to cost and availability. To address this challenge, we propose ICLEF, a novel human-AI collaboration approach to model distillation that incorporates scarce expert human feedback by combining in-context learning and model self-critique. We show that our method leads to generation of high-quality synthetic explainable style transfer datasets for formality (E-GYAFC) and subjective bias (EWNC). Via automatic and human evaluation, we show that specialized student models finetuned on our datasets outperform generalist teacher models on the explainable style transfer task in one-shot settings, and perform competitively compared to few-shot teacher models, highlighting the quality of the data and the role of expert feedback. In an extrinsic task of authorship attribution, we show that explanations generated by smaller models fine-tuned on E-GYAFC are more predictive of authorship than explanations generated by few-shot teacher models.
ProLex: A Benchmark for Language Proficiency-oriented Lexical Substitution
Xuanming Zhang Columbia University, Zixun Chen Columbia University, and Zhou Yu Columbia University
Abstract:
Lexical Substitution discovers appropriate substitutes for a given target word in a context sentence. However, the task fails to consider substitutes that are of equal or higher proficiency than the target, an aspect that could be beneficial for language learners looking to improve their writing. To bridge this gap, we propose a new task — language proficiencyoriented lexical substitution. We also introduce ProLex, a novel benchmark designed to assess systems’ ability to generate not only appropriate substitutes but also substitutes that demonstrate better language proficiency. Besides the benchmark, we propose models that can automatically perform the new task. We show that our best model, a Llama2-13B model fine-tuned with task-specific synthetic data, outperforms ChatGPT by an average of 3.2% in F-score and achieves comparable results with GPT-4 on ProLex.
LOCALRQA: From Generating Data to Locally Training, Testing, and Deploying Retrieval-Augmented QA Systems
Xiao Yu Columbia University, Yunan Lu Columbia University, Zhou Yu Columbia University
Abstract:
Retrieval-augmented question-answering systems combine retrieval techniques with large language models to provide answers that are more accurate and informative. Many existing toolkits allow users to quickly build such systems using off-the-shelf models, but they fall short in supporting researchers and developers to customize the model training, testing, and deployment process. We propose LOCALRQA1 , an open-source toolkit that features a wide selection of model training algorithms, evaluation methods, and deployment tools curated from the latest research. As a showcase, we build QA systems using online documentation obtained from Databricks and Faire’s websites. We find 7B-models trained and deployed using LOCALRQA reach a similar performance compared to using OpenAI’s text-ada-002 and GPT-4-turbo.
Large Language Models are Few-Shot Training Example Generators: A Case Study in Fallacy Recognition
Tariq Alhindi Mohamed bin Zayed University of Artificial Intelligence, Smaranda Muresan Columbia University, Preslav Nakov Mohamed bin Zayed University of Artificial Intelligence
Abstract:
Recognizing fallacies is crucial for ensuring the quality and validity of arguments across various domains. However, computational fallacy recognition faces challenges due to the diverse genres, domains, and types of fallacies found in datasets. This leads to a highly multiclass, and even multi-label, setup with substantial class imbalance. In this study, we aim to enhance existing models for fallacy recognition by incorporating additional context and by leveraging large language models to generate synthetic data, thus increasing the representation of the infrequent classes. We experiment with GPT-3.5 to generate synthetic examples and we examine the impact of prompt settings for this. Moreover, we explore zero-shot and few-shot scenarios to evaluate the effectiveness of using the generated examples for training smaller models within a unified fallacy recognition framework. Furthermore, we analyze the overlap between the synthetic data and existing fallacy datasets. Finally, we investigate the usefulness of providing supplementary context for detecting fallacy types that need such context, e.g., diversion fallacies. Our evaluation results demonstrate consistent improvements across fallacy types, datasets, and generators. The code and the synthetic datasets are all publicly available.
Columbia Engineering Professors Win NSF Early Career Award
Brian Smith received an NSF CAREER Award to develop a framework that will improve digital imagery so that blind and low-vision (BLV) individuals can better perceive and interact with visual content in the digital realm.
Baishakhi Ray Wins Most Impactful Paper At ICSME ’23
The paper “An Empirical Study of API Stability and Adoption in the Android Ecosystem”, was recognized as the Most Impactful Paper from among the published papers at ICSME ’13.
CS Professors Win Research Awards from the Columbia Center of AI Technology
The projects will explore algorithmic fairness, unified methods for interpreting artistic images found on the internet, and the development of a differentially-private data market system.
IEEE Micro Top Picks From the 2022 Architecture Conferences
“Revisiting Residue Codes for Modern Memories” from the Computer Engineering group is one of the Top Picks for IEEE Micro Magazine.
Voices of CS: Sitong Wang
The first-year PhD student is developing tools that help people create engaging images and videos.
After growing up in Jiangsu, China, Sitong Wang studied electrical engineering at Chongqing University and the University of Cincinnati. During her co-op at the Hong Kong University of Science and Technology (HKUST), she was introduced to Human-Computer Interaction (HCI). This research area understands and enhances the interaction between humans and computers. She became interested in the field and then took her master’s at Columbia CS. Wang was intrigued by how computation can power the creative process when she worked on a design challenge that blends pop culture references with products or services and helped a group of students promote their beverage start-up.
Encouraged by the creative work she could do, Wang joined the Computational Design Lab as a PhD student to continue to work with Assistant Professor Lydia Chilton and explore ways to design AI-powered creativity support tools. She recently published her first first-author research paper at the Conference on Human Factors in Computing Systems (CHI 2023). She and colleagues designed PopBlends, a system that automatically suggests conceptual blends by connecting a user’s topic with a pop culture domain. Their user study shows that people found twice as many blend suggestions as they did without the system and with half the mental demand.
We caught up with Wang to discuss her research, her work on generative AI tools, and what it is like to be a graduate student at Columbia.
Q: What is PopBlends and why did you choose to focus on the design process?
In the paper, we tackled the creative challenge of designing pop culture blends—images that use pop culture references to promote a product or service. We designed PopBlends, an automated pipeline consisting of three complementary strategies to find creative connections between a product and a pop culture domain.
Our work explores how large language models (LLMs) can provide associative knowledge and commonsense reasoning for creative tasks. We also discuss how to combine the power of traditional knowledge bases and LLMs to support creators in their divergent and convergent thinking.
It can help people, especially those without a design background, create pop culture blends more easily to advertise their brands. We want to make the design process more enjoyable and less cognitively demanding for everyone. We hope to enhance people’s creativity and productivity by scaffolding the creative process and using the power of computation to help people explore the design space more efficiently.
Q: Why did you create a tool incorporating pop culture into product ads?
Pop culture is important in everyday communication. Pop culture blends are helpful for online campaigns because they capture attention and connect the product to something people already know and like. However, creating these images is a challenging conceptual blending task and requires finding connections between two very different domains.
So we built an automated computational pipeline that can effectively support divergent and convergent thinking in finding such creative connections. We explored how to apply generative AI to creative workflows to assist people better—generative AI is powerful, but it is not perfect—thus, it is valuable to use different strategies that combine a knowledge base (which is accurate) and LLM (which has a vast amount of data) to support creative tasks.
Q: How were large language models (LLMs) helpful in your research?
Conceptual blending is complex—the design space is vast and valuable connections are rare—to tackle this challenge, we need to scaffold the ideation process and combine the intelligence of humans and machines. When we started this project, GPT-3 was not yet available; we tried traditional NLP techniques to find attribute associations (e.g., Chewbacca is fluffy) but faced challenges. Then, by chance, we tried GPT-3, which worked well with the necessary prompt engineering.
I was surprised by the associative reasoning capability of LLMs—which is technically a model that predicts the most probable next word. It easily listed related concepts for different domains and could suggest possible creative connections. I was also surprised by the hallucinations the LLMs made through our experiments, and the models could say things that were not true with great confidence.
As an emerging technology, LLMs are powerful in many ways and open up new opportunities for the computational design field. However, LLMs currently have a lot of limitations; it is essential to explore how to build system architectures around them to produce valuable results for people.
Q: How was it like presenting your work at CHI?
I was both nervous and excited because it had been a long time since I had presented in front of a crowd (since we did everything online during COVID). It was also my first time presenting at a computing conference, and the “Large Language Models” session I attended was very popular.
I am grateful to my labmate Vivian Liu, who provided valuable advice, helped me rehearse, and took pictures of me. The presentation went well, and I am glad we had the opportunity to present our work to a large audience of researchers. I would also like to express my gratitude to the researchers I met during the conference, as they provided encouragement and helpful tips that greatly contributed to my experience.
Q: What are you working on now?
I am working on a tool to help journalists transform their print articles into reels using generative AI by assisting them in the creative stages of producing scripts, character boards, and storyboards. In this work, in addition to LLMs, we incorporate text-to-image models and try to combine the power of both to support creators.
During the summer, I will work as a research intern at Adobe, where I will be focusing on AI and video authoring. Our work will revolve around facilitating the future of podcast video creation.
Q: Can you talk about your background and why you pursued a PhD?
My undergraduate program offered great co-op opportunities that allowed me to explore different paths, including roles as an engineer, UI designer, and research intern across Chongqing, Charlottesville, and Hong Kong. During my final co-op, I had the opportunity to work in the HCI lab at the Hong Kong University of Science and Technology (HKUST). This experience ignited my passion for HCI research and marked the beginning of my research journey in this field.
I enjoy exploring unanswered questions, particularly those that reside at the intersection of multiple disciplines. A PhD program provides an excellent opportunity to work on the problems that interest me the most. In addition, I think the training provided at the PhD level can enhance essential skills such as leadership, collaboration, critical thinking, and effective communication.
Q: What are your research interests?
My research interest lies in the creativity support in the HCI field. I am particularly interested in exploring the role of multimodal generative AI in creativity support tools. I enjoy developing co-creative interactive systems to support everyone in their everyday creative tasks.
Q: What research questions or issues do you hope to answer now?
I want to explore the role of generative AI models in future creativity support tools and build co-creative intelligent systems that support multimodal creativity, especially in the dimensions of audio and videos, as they are how we interact with the world. I also want to explore some theoretical questions, such as the overtrust/overreliance in AI, and see how we might understand and resolve them.
Q: Why did you choose to apply to Columbia CS? What attracted you to the program?
I love the vibrant environment of Columbia and NYC and how Columbia is strong in diverse disciplines, such as journalism, business, and law. It is an ideal place to do multi-disciplinary collaborative research.
Also, I got to know Professor Chilton well during my masters at Columbia. She is incredibly supportive and wonderful, and we share many common interests. That is why I chose to continue to work with her for my PhD journey.
Q: What has been the highlight of your time at Columbia?
The highlight would be when I witnessed the success of the students I mentored. It was such a rewarding process to guide and help undergraduate students interested in HCI research begin their journey.
Q: What is your advice to students on how to navigate their time at Columbia? If they want to do research, what should they know or do to prepare?
Enjoy your time in NYC! Please don’t burn yourself out; learn how to manage your time efficiently. Don’t be afraid to try new things—start with manageable tasks, but also step out of your comfort zone. You will have fun!
If you want to do research, find research questions that genuinely interest you and be prepared to face challenges. Most importantly, preserve and trust yourself and your collaborators. Your efforts will eventually pay off!
10 Research Papers Accepted to CVPR 2023
Research from the department has been accepted to the 2023 Computer Vision and Pattern Recognition (CVPR) Conference. The annual event explores machine learning, artificial intelligence, and computer vision research and its applications.
CoWs on Pasture: Baselines and Benchmarks for Language-Driven Zero-Shot Object Navigation
Samir Yitzhak Gadre Columbia University, Mitchell Wortsman University of Washington, Gabriel Ilharco University of Washington, Ludwig Schmidt University of Washington, Shuran Song Columbia University
For robots to be generally useful, they must be able to find arbitrary objects described by people (i.e., be language-driven) even without expensive navigation training on in-domain data (i.e., perform zero-shot inference). We explore these capabilities in a unified setting: language-driven zero-shot object navigation (L-ZSON). Inspired by the recent success of open-vocabulary models for image classification, we investigate a straightforward framework, CLIP on Wheels (CoW), to adapt open-vocabulary models to this task without fine-tuning. To better evaluate L-ZSON, we introduce the Pasture benchmark, which considers finding uncommon objects, objects described by spatial and appearance attributes, and hidden objects described relative to visible objects. We conduct an in-depth empirical study by directly deploying 21 CoW baselines across Habitat, RoboTHOR, and Pasture. In total, we evaluate over 90k navigation episodes and find that (1) CoW baselines often struggle to leverage language descriptions, but are proficient at finding uncommon objects. (2) A simple CoW, with CLIP-based object localization and classical exploration — and no additional training — matches the navigation efficiency of a state-of-the-art ZSON method trained for 500M steps on Habitat MP3D data. This same CoW provides a 15.6 percentage point improvement in success over a state-of-the-art RoboTHOR ZSON model.
Towards Fast Adaptation of Pretrained Contrastive Models for Multi-Channel Video-Language Retrieval
Xudong Lin Columbia University, Simran Tiwari Columbia University, Shiyuan Huang Columbia University, Manling Li UIUC, Mike Zheng Shou National University of Singapore, Heng Ji UIUC, Shih-Fu Chang Columbia University
Multi-channel video-language retrieval require models to understand information from different channels (e.g. video+question, video+speech) to correctly link a video with a textual response or query. Fortunately, contrastive multimodal models are shown to be highly effective at aligning entities in images/videos and text, e.g., CLIP; text contrastive models are extensively studied recently for their strong ability of producing discriminative sentence embeddings, e.g., SimCSE. However, there is not a clear way to quickly adapt these two lines to multi-channel video-language retrieval with limited data and resources. In this paper, we identify a principled model design space with two axes: how to represent videos and how to fuse video and text information. Based on categorization of recent methods, we investigate the options of representing videos using continuous feature vectors or discrete text tokens; for the fusion method, we explore the use of a multimodal transformer or a pretrained contrastive text model. We extensively evaluate the four combinations on five video-language datasets. We surprisingly find that discrete text tokens coupled with a pretrained contrastive text model yields the best performance, which can even outperform state-of-the-art on the iVQA and How2QA datasets without additional training on millions of video-text data. Further analysis shows that this is because representing videos as text tokens captures the key visual information and text tokens are naturally aligned with text models that are strong retrievers after the contrastive pretraining process. All the empirical analysis establishes a solid foundation for future research on affordable and upgradable multimodal intelligence.
DiGeo: Discriminative Geometry-Aware Learning for Generalized Few-Shot Object Detection
Jiawei Ma Columbia University, Yulei Niu Columbia University, Jincheng Xu Columbia University, Shiyuan Huang Columbia University, Guangxing Han Columbia University, Shih-Fu Chang Columbia University
Generalized few-shot object detection aims to achieve precise detection on both base classes with abundant annotations and novel classes with limited training data. Existing approaches enhance few-shot generalization with the sacrifice of base-class performance, or maintain high precision in base-class detection with limited improvement in novel-class adaptation. In this paper, we point out the reason is insufficient Discriminative feature learning for all of the classes. As such, we propose a new training framework, DiGeo, to learn Geometry-aware features of inter-class separation and intra-class compactness. To guide the separation of feature clusters, we derive an offline simplex equiangular tight frame (ETF) classifier whose weights serve as class centers and are maximally and equally separated. To tighten the cluster for each class, we include adaptive class-specific margins into the classification loss and encourage the features close to the class centers. Experimental studies on two few-shot benchmark datasets (VOC, COCO) and one long-tail dataset (LVIS) demonstrate that, with a single model, our method can effectively improve generalization on novel classes without hurting the detection of base classes.
Supervised Masked Knowledge Distillation for Few-Shot Transformers
Han Lin Columbia University, Guangxing Han Columbia University, Jiawei Ma Columbia University, Shiyuan Huang Columbia University, Xudong Lin Columbia University, Shih-Fu Chang Columbia University
Vision Transformers (ViTs) emerge to achieve impressive performance on many data-abundant computer vision tasks by capturing long-range dependencies among local features. However, under few-shot learning (FSL) settings on small datasets with only a few labeled data, ViT tends to overfit and suffers from severe performance degradation due to its absence of CNN-alike inductive bias. Previous works in FSL avoid such problem either through the help of self-supervised auxiliary losses, or through the dextile uses of label information under supervised settings. But the gap between self-supervised and supervised few-shot Transformers is still unfilled. Inspired by recent advances in self-supervised knowledge distillation and masked image modeling (MIM), we propose a novel Supervised Masked Knowledge Distillation model (SMKD) for few-shot Transformers which incorporates label information into self-distillation frameworks. Compared with previous self-supervised methods, we allow intra-class knowledge distillation on both class and patch tokens, and introduce the challenging task of masked patch tokens reconstruction across intra-class images. Experimental results on four few-shot classification benchmark datasets show that our method with simple design outperforms previous methods by a large margin and achieves a new start-of-the-art. Detailed ablation studies confirm the effectiveness of each component of our model. Code for this paper is available here: this https URL.
FLEX: Full-Body Grasping Without Full-Body Grasps
Purva Tendulkar Columbia University, Dídac Surís Columbia University, Carl Vondrick Columbia University
Synthesizing 3D human avatars interacting realistically with a scene is an important problem with applications in AR/VR, video games and robotics. Towards this goal, we address the task of generating a virtual human — hands and full body — grasping everyday objects. Existing methods approach this problem by collecting a 3D dataset of humans interacting with objects and training on this data. However, 1) these methods do not generalize to different object positions and orientations, or to the presence of furniture in the scene, and 2) the diversity of their generated full-body poses is very limited. In this work, we address all the above challenges to generate realistic, diverse full-body grasps in everyday scenes without requiring any 3D full-body grasping data. Our key insight is to leverage the existence of both full-body pose and hand grasping priors, composing them using 3D geometrical constraints to obtain full-body grasps. We empirically validate that these constraints can generate a variety of feasible human grasps that are superior to baselines both quantitatively and qualitatively. See our webpage for more details: this https URL.
Humans As Light Bulbs: 3D Human Reconstruction From Thermal Reflection
Ruoshi Liu Columbia University, Carl Vondrick Columbia University
The relatively hot temperature of the human body causes people to turn into long-wave infrared light sources. Since this emitted light has a larger wavelength than visible light, many surfaces in typical scenes act as infrared mirrors with strong specular reflections. We exploit the thermal reflections of a person onto objects in order to locate their position and reconstruct their pose, even if they are not visible to a normal camera. We propose an analysis-by-synthesis framework that jointly models the objects, people, and their thermal reflections, which combines generative models with differentiable rendering of reflections. Quantitative and qualitative experiments show our approach works in highly challenging cases, such as with curved mirrors or when the person is completely unseen by a normal camera.
Tracking Through Containers and Occluders in the Wild
Basile Van Hoorick Columbia University, Pavel Tokmakov Toyota Research Institute, Simon Stent Woven Planet, Jie Li Toyota Research Institute, Carl Vondrick Columbia University
Tracking objects with persistence in cluttered and dynamic environments remains a difficult challenge for computer vision systems. In this paper, we introduce TCOW, a new benchmark and model for visual tracking through heavy occlusion and containment. We set up a task where the goal is to, given a video sequence, segment both the projected extent of the target object, as well as the surrounding container or occluder whenever one exists. To study this task, we create a mixture of synthetic and annotated real datasets to support both supervised learning and structured evaluation of model performance under various forms of task variation, such as moving or nested containment. We evaluate two recent transformer-based video models and find that while they can be surprisingly capable of tracking targets under certain settings of task variation, there remains a considerable performance gap before we can claim a tracking model to have acquired a true notion of object permanence.
Doubly Right Object Recognition: A Why Prompt for Visual Rationales
Chengzhi Mao Columbia University, Revant Teotia Columbia University, Amrutha Sundar Columbia University, Sachit Menon Columbia University, Junfeng Yang Columbia University, Xin Wang Microsoft Research, Carl Vondrick Columbia University
Many visual recognition models are evaluated only on their classification accuracy, a metric for which they obtain strong performance. In this paper, we investigate whether computer vision models can also provide correct rationales for their predictions. We propose a “doubly right” object recognition benchmark, where the metric requires the model to simultaneously produce both the right labels as well as the right rationales. We find that state-of-the-art visual models, such as CLIP, often provide incorrect rationales for their categorical predictions. However, by transferring the rationales from language models into visual representations through a tailored dataset, we show that we can learn a “why prompt,” which adapts large visual representations to produce correct rationales. Visualizations and empirical experiments show that our prompts significantly improve performance on doubly right object recognition, in addition to zero-shot transfer to unseen tasks and datasets.
What You Can Reconstruct From a Shadow
Ruoshi Liu Columbia University, Sachit Menon Columbia University, Chengzhi Mao Columbia University, Dennis Park Toyota Research Institute, Simon Stent Woven Planet, Carl Vondrick Columbia University
3D reconstruction is a fundamental problem in computer vision, and the task is especially challenging when the object to reconstruct is partially or fully occluded. We introduce a method that uses the shadows cast by an unobserved object in order to infer the possible 3D volumes under occlusion. We create a differentiable image formation model that allows us to jointly infer the 3D shape of an object, its pose, and the position of a light source. Since the approach is end-to-end differentiable, we are able to integrate learned priors of object geometry in order to generate realistic 3D shapes of different object categories. Experiments and visualizations show that the method is able to generate multiple possible solutions that are consistent with the observation of the shadow. Our approach works even when the position of the light source and object pose are both unknown. Our approach is also robust to real-world images where ground-truth shadow mask is unknown.
CLIP-Sculptor: Zero-Shot Generation of High-Fidelity and Diverse Shapes From Natural Language
Aditya Sanghi Autodesk Research, Rao Fu Brown University, Vivian Liu Columbia University, Karl D.D. Willis Autodesk Research, Hooman Shayani Autodesk Research, Amir H. Khasahmadi Autodesk Research, Srinath Sridhar Brown University, Daniel Ritchie Brown University
Recent works have demonstrated that natural language can be used to generate and edit 3D shapes. However, these methods generate shapes with limited fidelity and diversity. We introduce CLIP-Sculptor, a method to address these constraints by producing high-fidelity and diverse 3D shapes without the need for (text, shape) pairs during training. CLIP-Sculptor achieves this in a multi-resolution approach that first generates in a low-dimensional latent space and then upscales to a higher resolution for improved shape fidelity. For improved shape diversity, we use a discrete latent space which is modeled using a transformer conditioned on CLIP’s image-text embedding space. We also present a novel variant of classifier-free guidance, which improves the accuracy-diversity trade-off. Finally, we perform extensive experiments demonstrating that CLIP-Sculptor outperforms state-of-the-art baselines.
7 Papers Accepted to ICLR 2023
Research papers from the department were accepted to the 11th International Conference on Learning Representations (ICLR 2023). ICLR is the premier conference on deep learning where researchers gather to discuss their work in the fields of artificial intelligence, statistics, and data science.
Notable, top 5%
Visual Classification via Description from Large Language Models
Sachit Menon Columbia University, Carl Vondrick Columbia University
Keywords: vision-language models, CLIP, prompting, GPT-3, large language models, zero-shot recognition, multimodal
TL;DR: We enhance zero-shot recognition with vision-language models by comparing to category descriptors from GPT-3, enabling better performance in an interpretable setting that also allows for the incorporation of new concepts and bias mitigation.
Abstract:
Vision-language models such as CLIP have shown promising performance on a variety of recognition tasks using the standard zero-shot classification procedure — computing similarity between the query image and the embedded words for each category. By only using the category name, they neglect to make use of the rich context of additional information that language affords. The procedure gives no intermediate understanding of why a category is chosen and furthermore provides no mechanism for adjusting the criteria used towards this decision. We present an alternative framework for classification with VLMs, which we call classification by description. We ask VLMs to check for descriptive features rather than broad categories: to find a tiger, look for its stripes; its claws; and more. By basing decisions on these descriptors, we can provide additional cues that encourage using the features we want to be used. In the process, we can get a clear idea of what the model “thinks” it is seeing to make its decision; it gains some level of inherent explainability. We query large language models (e.g., GPT-3) for these descriptors to obtain them in a scalable way. Extensive experiments show our framework has numerous advantages past interpretability. We show improvements in accuracy on ImageNet across distribution shifts; demonstrate the ability to adapt VLMs to recognize concepts unseen during training; and illustrate how descriptors can be edited to effectively mitigate bias compared to the baseline.
Notable, top 25%
CROM: Continuous Reduced-Order Modeling of PDEs Using Implicit Neural Representations
Peter Yichen Chen Columbia University, Jinxu Xiang Columbia University, Dong Heon Cho Columbia University, Yue Chang University of Toronto, G A Pershing Columbia University, Henrique Teles Maia Columbia University, Maurizio M Chiaramonte Meta Reality Labs Research, Kevin Thomas Carlberg Meta Reality Labs Research, Eitan Grinspun University of Toronto
Keywords: PDE, implicit neural representation, neural field, latent space traversal, reduced-order modeling, numerical methods
TL;DR: We accelerate PDE solvers via rapid latent space traversal of continuous vector fields leveraging implicit neural representations.
Abstract:
The long runtime of high-fidelity partial differential equation (PDE) solvers makes them unsuitable for time-critical applications. We propose to accelerate PDE solvers using reduced-order modeling (ROM). Whereas prior ROM approaches reduce the dimensionality of discretized vector fields, our continuous reduced-order modeling (CROM) approach builds a low-dimensional embedding of the continuous vector fields themselves, not their discretization. We represent this reduced manifold using continuously differentiable neural fields, which may train on any and all available numerical solutions of the continuous system, even when they are obtained using diverse methods or discretizations. We validate our approach on an extensive range of PDEs with training data from voxel grids, meshes, and point clouds. Compared to prior discretization-dependent ROM methods, such as linear subspace proper orthogonal decomposition (POD) and nonlinear manifold neural-network-based autoencoders, CROM features higher accuracy, lower memory consumption, dynamically adaptive resolutions, and applicability to any discretization. For equal latent space dimension, CROM exhibits 79x and 49x better accuracy, and 39x and 132x smaller memory footprint, than POD and autoencoder methods, respectively. Experiments demonstrate 109x and 89x wall-clock speedups over unreduced models on CPUs and GPUs, respectively. Videos and codes are available on the project page: https://crom-pde.github.io
Posters
Quantile Risk Control: A Flexible Framework for Bounding the Probability of High-Loss Predictions
Jake Snell Princeton University, Thomas P Zollo Columbia University, Zhun Deng Columbia University, Toniann Pitassi Columbia University, Richard Zemel Columbia University
Keywords: distribution-free uncertainty quantification
TL;DR: We propose a framework to rigorously and flexible control the quantiles of the loss distribution incurred by a predictor or set of predictors.
Abstract:
Rigorous guarantees about the performance of predictive algorithms are necessary in order to ensure their responsible use. Previous work has largely focused on bounding the expected loss of a predictor, but this is not sufficient in many risk-sensitive applications where the distribution of errors is important. In this work, we propose a flexible framework to produce a family of bounds on quantiles of the loss distribution incurred by a predictor. Our method takes advantage of the order statistics of the observed loss values rather than relying on the sample mean alone. We show that a quantile is an informative way of quantifying predictive performance, and that our framework applies to a variety of quantile-based metrics, each targeting important subsets of the data distribution. We analyze the theoretical properties of our proposed method and demonstrate its ability to rigorously control loss quantiles on several real-world datasets.
Causal Imitation Learning via Inverse Reinforcement Learning
Kangrui Ruan Columbia University, Junzhe Zhang Columbia University, Xuan Di Columbia University, Elias Bareinboim Columbia University
Keywords: Causal Inference, Graphical Models
TL;DR: This paper proposes novel inverse reinforcement learning methods to learn effective imitating policies from the expert’s demonstrations when unobserved confounders are present.
Abstract:
One of the most common ways children learn when unfamiliar with the environment is by mimicking adults. Imitation learning concerns an imitator learning to behave in an unknown environment from an expert’s demonstration; reward signals remain latent to the imitator. This paper studies imitation learning through causal lenses and extends the analysis and tools developed for behavior cloning (Zhang, Kumor, Bareinboim, 2020) to inverse reinforcement learning. First, we propose novel graphical conditions that allow the imitator to learn a policy performing as well as the expert’s behavior policy, even when the imitator and the expert’s state-action space disagree, and unobserved confounders (UCs) are present. When provided with parametric knowledge about the unknown reward function, such a policy may outperform the expert’s. Also, our method is easily extensible and allows one to leverage existing IRL algorithms even when UCs are present, including the multiplicative-weights algorithm (MWAL) (Syed & Schapire, 2008) and the generative adversarial imitation learning (GAIL) (Ho & Ermon, 2016). Finally, we validate our framework by simulations using real-world and synthetic data.
Neural Causal Models for Counterfactual Identification and Estimation
Kevin Muyuan Xia Columbia University, Yushu Pan Columbia University, Elias Bareinboim Columbia University
Keywords: causal inference, deep learning, neural models, neural causal models, causal identification, causal estimation, counterfactual
TL;DR: We solve the two problems of counterfactual identification and estimation from arbitrary surrogate experiments using a Generative Adversarial Network implementation of the Neural Causal Model.
Abstract:
Evaluating hypothetical statements about how the world would be had a different course of action been taken is arguably one key capability expected from modern AI systems. Counterfactual reasoning underpins discussions in fairness, the determination of blame and responsibility, credit assignment, and regret. In this paper, we study the evaluation of counterfactual statements through neural models. Specifically, we tackle two causal problems required to make such evaluations, i.e., counterfactual identification and estimation from an arbitrary combination of observational and experimental data. First, we show that neural causal models (NCMs) are expressive enough and encode the structural constraints necessary for performing counterfactual reasoning. Second, we develop an algorithm for simultaneously identifying and estimating counterfactual distributions. We show that this algorithm is sound and complete for deciding counterfactual identification in general settings. Third, considering the practical implications of these results, we introduce a new strategy for modeling NCMs using generative adversarial networks. Simulations corroborate with the proposed methodology.
Understanding Zero-shot Adversarial Robustness for Large-Scale Models
Chengzhi Mao Columbia University, Scott Geng Columbia University, Junfeng Yang Columbia University, Xin Wang Microsoft Research, Carl Vondrick Columbia University
Keywords: Adversarial Robustness, Zero-Shot Recognition
Abstract:
Pretrained large-scale vision-language models like CLIP have exhibited strong generalization over unseen tasks. Yet imperceptible adversarial perturbations can significantly reduce CLIP’s performance on new tasks. In this work, we identify and explore the problem of adapting large-scale models for zero-shot adversarial robustness. We first identify two key factors during model adaption–training losses and adaptation methods–that affect the model’s zero-shot adversarial robustness. We then propose a text-guided contrastive adversarial training loss, which aligns the text embeddings and the adversarial visual features with contrastive learning on a small set of training data. We apply this training loss to two adaption methods, model finetuning and visual prompt tuning. We find that visual prompt tuning is more effective in the absence of texts, while finetuning wins in the existence of text guidance. Overall, our approach significantly improves the zero-shot adversarial robustness over CLIP, seeing an average improvement of 31 points over ImageNet and 15 zero-shot datasets. We hope this work can shed light on understanding the zero-shot adversarial robustness of large-scale models.
TempCLR: Temporal Alignment Representation with Contrastive Learning
Yuncong Yang Columbia University, Jiawei Ma Columbia University, Shiyuan Huang Columbia University, Long Chen Columbia University, Xudong Lin Columbia University, Guangxing Han Columbia University, Shih-Fu Chang Columbia University
Keywords: Representation learning, Global Sequence Alignment, Zero/Few-shot Transfer
TL;DR: Global sequence matching under temporal order consistency matters in contrastive-based video-paragraph/text learning.
Abstract:
Video representation learning has been successful in video-text pre-training for zero-shot transfer, where each sentence is trained to be close to the paired video clips in a common feature space. For long videos, given a paragraph of description where the sentences describe different segments of the video, by matching all sentence-clip pairs, the paragraph and the full video are aligned implicitly. However, such unit-level similarity measure may ignore the global temporal context over a long time span, which inevitably limits the generalization ability. In this paper, we propose a contrastive learning framework TempCLR to compare the full video and the paragraph explicitly. As the video/paragraph is formulated as a sequence of clips/sentences, under the constraint of their temporal order, we use dynamic time warping to compute the minimum cumulative cost over sentence-clip pairs as the sequence-level distance. To explore the temporal dynamics, we break the consistency of temporal order by shuffling the video clips or sentences according to the temporal granularity. In this way, we obtain the representations for clips/sentences, which perceive the temporal information and thus facilitate the sequence alignment. In addition to pre-training on the video and paragraph, our approach can also generalize on the matching between different video instances. We evaluate our approach on video retrieval, action step localization, and few-shot action recognition, and achieve consistent performance gain over all three tasks. Detailed ablation studies are provided to justify the approach design.
Voices of CS: Gaurav Jain
The third-year PhD student is creating tools to help people with vision impairments navigate the world.
Imagine walking to your office from the subway station on a Monday morning. You notice a new café on the way, so you decide to take a detour and try a latté. That sounds like a normal way to start the week, right?
But for people with vision impairment or low vision, like those who are categorized as blind and low vision (BLV), this kind of spontaneous exploration while outside is challenging. Current navigation assistance systems (NAS) provide turn-by-turn instructions, but they do not allow visually impaired users to deviate from the shortest path to their destination or make decisions on the fly. As a result, people with vision impairment or low vision often miss out on the freedom to go out and navigate on their own terms.
In a paper published at the ACM Conference On Computer-Supported Cooperative Work And Social Computing (CSCW ‘23), computer science researchers introduced the concept of “Exploration Assistance,” which is an evolution of current NASs that can support BLV people’s exploration in unfamiliar environments. Led by Gaurav Jain, the researchers investigated how NASs should be designed by interviewing BLV people, orientation and mobility instructors, and leaders of blind-serving organizations, to understand their specific needs and challenges. Their findings highlight the types of spatial information required for exploration beyond turn-by-turn instructions and the difficulties faced by BLV people when exploring alone or with the help of others.
Jain, who is advised by Assistant Professor Brian Smith, is a PhD student in the Computer-Enabled Abilities Laboratory (CEAL Lab), where researchers develop computers that help people perceive and interact with the world around them. Their paper presents the results of interviews with BLV people and other stakeholders to identify the types of spatial information BLV people need for exploration and the challenges BLV people face when exploring unfamiliar environments. The paper offers insights into the design and development of new navigation assistance systems that can support BLV people in exploring unfamiliar environments with greater spontaneity and agency.
Based on their findings, they presented several instances of NASs that support the exploration assistance paradigm and identify several challenges that need to be overcome to make these systems a reality. Jain hopes that his research will ultimately enable BLV people to experience greater agency and independence as they navigate and explore their environments. We sat down with Jain to learn more about his research, doing qualitative research, and the thought processes behind writing research papers.
Q: What is exploration assistance and why is it important to do research on it?
This research is incredibly exciting for the blind and low vision (BLV) community, as it represents a significant step towards equal access and agency in exploring unfamiliar environments. For BLV people, the ability to navigate and explore independently is essential to daily life, and current navigation assistance systems often limit their ability to do so. By introducing the concept of exploration assistance, this research opens up new possibilities for BLV people to explore and discover their surroundings with greater spontaneity and freedom. This research has the potential to significantly improve the quality of life for BLV people and is a major development in the ongoing pursuit of accessibility and inclusion for all.
Q: How did you become part of the research project?
This was my first project as a PhD student in the CEAL lab. The project was initiated as a camera-based wearable NAS for BLV people, and we conducted several formative studies with BLV people.
As we progressed, we realized that there was a significant research gap in the research community’s understanding of how NASs could support BLV people’s exploration in navigation. Based on these findings, we shifted our focus toward investigating this gap, and the paper I worked on was the result of this pivot. The paper is titled, “I Want to Figure Things Out”: Supporting Exploration in Navigation for People with Visual Impairments.
Q: The research was more qualitative, right? How did you find working on it?
Over the course of approximately one year, I had the opportunity to work on this project that challenged me to step outside of my comfort zone as a human-computer interaction (HCI) researcher. Before this project, my research experience had primarily focused on computer vision and deep learning. I was more at ease with HCI systems research, which involved designing, building, and evaluating tools and techniques to solve user problems.
This project, however, was a qualitative research study that aimed to gain a deeper understanding of user needs, behaviors, challenges, and attitudes toward technology through in-depth interviews, observations, and other qualitative data collection methods. To prepare for this project, I had to immerse myself in the field of accessibility and navigation assistance for BLV people and read extensively on papers that employed qualitative research methods.
Although it took some time for me to shift my mindset towards qualitative research, this project helped me become a more well-rounded researcher, as I now feel comfortable with both qualitative and systems research. Overall, this project was a significant personal and professional growth experience, as I was able to expand my research expertise and contribute to a worthy cause.
Q: Can you talk about the process of writing the paper? When it came time to start writing, how did you organize your thoughts and the data?
Writing the paper was a critical stage in the research process, and I approached it by first organizing my thoughts and drafting a clear outline. I started by creating an outline of the paper with section and subsection headers, accompanied by a brief summary of what I intended to discuss in each section. This process allowed me to see the overall structure of the paper and ensure that I covered all the essential elements.
Once I had a clear structure in mind, I began to tackle each section of the paper one by one, starting with the introduction and then moving on to the methods, results, and discussion sections. I iteratively refined my writing based on feedback from my advisor, lab mates, and friends.
Throughout the writing process, I also ensured that my writing was clear, concise, and easy to follow. I paid close attention to the flow of ideas and transitions between sections, making sure that each paragraph and sentence contributed to the overall argument and was well-supported by the evidence.
Overall, the process of writing the paper was challenging but rewarding. It allowed me to synthesize the research findings and present them in a compelling way, showcasing the impact of our work on the lives of BLV people.
Q: What did you find surprising or challenging about the process?
Throughout the research process, I encountered various challenges that both surprised and tested me. Interviewing participants, in particular, proved to be an intriguing yet difficult task. Initially, I struggled to guide conversations naturally toward my research questions without leading participants toward a certain answer. However, with each interview, I became more confident and began to enjoy the process. Hearing firsthand from BLV people that our work could make a real impact on their lives was also incredibly rewarding.
Analyzing and synthesizing the interview data was another major challenge. Unlike quantitative data, conversations are often open-ended and context-dependent, making it difficult to separate my own biases from the interviewee’s responses. I spent a considerable amount of time reviewing the interview transcripts and identifying emerging themes. To facilitate this process, I leveraged tools like NVivo to better organize the interview data, and our team held several discussions to refine these themes. To ensure the accuracy of our interpretation, we sought feedback from two BLV interns who worked with us over the summer on another project.
Overall, this research experience pushed me to become more adaptable. While it presented its own unique set of challenges, I am proud to have contributed to a project that has the potential to create meaningful change in the lives of BLV people.
Q: Did it change your view on how you should do research?
Yes, my experience with this research project has certainly changed my view on how to approach research. It has taught me the importance of keeping the paper in mind from the beginning of a project.
Now, I make a conscious effort to think about how I want to present my work and what story I want to tell with the research. This helps me gain more clarity on the direction of the project and how to steer it toward producing meaningful results. As part of my workflow, I now write early drafts of paper introductions even before developing any tools or systems. This allows me to zoom out from the day-to-day technical challenges and see the big picture, which is crucial in making sure that the research is both impactful and well-presented.
Q: What are your tips for writing a research paper?
Writing a research paper can be a challenging task, but here are a few tips that have helped me make the process smoother:
- Start with a rough draft: Don’t expect your first draft to be perfect. It’s important to just start writing and get your ideas on paper. You can always revise and edit later. Use a tool like Microsoft Word or Google Docs to get started instead of working directly with Overleaf. I found this to take the pressure off me.
- Observe your advisor’s edits: Your advisor can be a valuable resource when it comes to writing. Observing your advisor edit your drafts can help you learn from their feedback. I usually ask my advisor, Brian Smith, to describe why he made a certain edit and that helps me understand his process and also identify specific issues where I need to work more on.
- Get feedback and revise: It’s important to get feedback on your paper from others. Share your draft with colleagues, friends, and family, and ask for their honest feedback. Use their feedback to revise and improve your paper. Whenever I’m writing, I socialize my writing with others, including my advisor, my lab mates, my friends, and my family. Interestingly, I get the most useful feedback from my friends and family, who have no idea what my research is about. I ask them to describe what they understood from the text I shared and try to match their description with my intended purpose. Writing is an iterative process; it takes several drafts before you have a polished paper.
Finally, one resource that I would totally recommend to every PhD student at Columbia is Adjunct Professor Janet Kayfetz’s class on Technical Writing. Her class is an excellent way to deeply understand research writing.
Q: What are you working on now?
I am currently working on two exciting projects that further my research goal of developing inclusive physical and digital environments for BLV people. The first project involves enhancing the capabilities of smart streets, streets with sensors like cameras and computing power, to help BLV people navigate street intersections safely.
This project is part of the NSF Engineering Research Center for Smart Streetscapes’ application thrust. The second project is focused on making videos accessible to BLV people by creating high-quality audio descriptions available at scale.
Q: Can you talk about your background and why you decided to pursue a PhD?
My exposure to research during my undergrad was invaluable, as it allowed me to work on diverse projects utilizing computer vision for various applications such as biometric security and medical imaging. These experiences instilled in me a passion for the research process. It was fulfilling to be able to identify problems that I care about, explore solutions, and disseminate new knowledge.
While I knew I enjoyed research, it was during the summer research fellowship at the Indian Institute of Sciences, where I collaborated with Professor P. K. Yalavarthy in the Medical Imaging Group, that crystallized my decision to pursue a PhD. The opportunity to work in a research lab, lead a project, and receive mentorship from an experienced advisor provided a glimpse of what a PhD program entails. I was excited by the prospect of being able to make a real-world impact by solving complex problems, and it was then that I decided to pursue a career in research.
Q: How has your research interest changed since you started your PhD?
I am interested in building Human-AI systems that embed AI technologies (e.g., computer vision) into human interactions to help BLV people better experience the world around them. My work on exploration assistance informs the design of future navigation assistance systems that enable BLV people to experience the physical world with more agency and spontaneity during navigation.
In addition to the physical world, I’ve also broadened my research focus to enhance BLV people’s experiences within the digital world. For example, I developed a system that makes it possible for BLV people to visualize the action in sports broadcasts rather than relying on other people’s descriptions of the game.
Q: What sort of research questions do you hope to answer now?
Accessibility research has traditionally focused on aiding daily-life activities and providing access to digital information for productivity and work, but there’s an increasing realization that providing access to everyday cultural experiences is equally important for inclusion and well-being.
This encompasses various forms of entertainment and recreation, such as watching TV, exploring museums, playing video games, listening to music, and engaging with social media. Ensuring that everyone has equal opportunities to enjoy these experiences is an emerging challenge. My goal is to design human-AI systems that enhance such experiences.
Q: Why did you choose to apply to Columbia CS? What attracted you to the program?
I was drawn to Columbia CS because of the type of problems my advisor works on. His research focused on creating systems that have a direct impact on people’s lives, where evaluating the user’s experience with the system is a key component.
This was a departure from my undergraduate research, where I focused on building systems to achieve high accuracy and efficiency. I found this user-centered approach to be extremely exciting, especially in the context of his project “RAD,” which aimed to make video games accessible to blind gamers. It was a super exciting prospect to be working on similar problems where you can firsthand see how people reacted and benefited from your solutions. This still remains one of the most fulfilling aspects of HCI research for me. In the end, this is what led me to choose Columbia and work with Brian Smith.
Q: What has been the highlight of your time at Columbia?
The first thing that comes to mind is the people that I have had the pleasure of working with and meeting. I am grateful for the opportunity to learn from my advisor and appreciate the incredible atmosphere he has created for me to thrive.
Additionally, I have been fortunate enough to make some amazing friends here at Columbia who have become a vital support system. Balancing work with passions outside of work has also been important to me, and I am grateful for the chance to engage with student clubs such as the dance team, Columbia Bhangra, and meet some amazing people there as well. Overall, the community at Columbia has been a highlight for me.
Q: What is your advice to students on how to navigate their time at Columbia? If they want to do research, what should they know or do to prepare?
One thing that students wanting to do research should know is that research involves a lot of uncertainty and ambiguity. In fact, dealing with uncertainty can be one of the most challenging aspects of research, even more so than learning the technical skills required to complete a project.
In my own experience, staying motivated about the problem statement has been key to powering through those uncertain moments. Therefore, it is important to be true to yourself about what you are really excited about and work on those problems. Ultimately, this approach can go a long way in helping you navigate your time at Columbia and make the most of your research opportunities.
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