Meeting Schedule

Location: Hybrid - Buchanan 430, and the zoom link below

Time: Wednesdays at 10:30am, Mountain Time

Zoom link: https://cuboulder.zoom.us/j/97014876908

Date	Title
01/24/2024	Planning, introductions, welcome!
01/31/2024	Brunch Social
02/07/2024	No Meeting - Virtual PhD Open House
02/14/2024	ACL paper clinic
02/21/2024	Cancelled in favor of LING Circle talk by Professor Gibbs
02/28/2024	Short talks by Kathy McKeown and Robin Burke Kathy's web page: https://www.cs.columbia.edu/~kathy/ Title: Addressing Large Language Models that Lie: Case Studies in Summarization Kathleen McKeown Columbia University The advent of large language models promises a new level of performance in generation of text of all kinds, enabling generation of text that is far more fluent, coherent and relevant than was previously possible. However, they also introduce a major new problem: they wholly hallucinate facts out of thin air. When summarizing an input document, they may incorrectly intermingle facts from the input, they may introduce facts that were not mentioned at all, and worse yet, they may even make up things that are not true in the real world. In this talk, I will discuss our work in characterizing the kinds of errors that can occur and methods that we have developed to help mitigate hallucination in language modeling approaches to text summarization for a variety of genres. Kathleen R. McKeown is the Henry and Gertrude Rothschild Professor of Computer Science at Columbia University and the Founding Director of the Data Science Institute, serving as Director from 2012 to 2017. In earlier years, she served as Department Chair (1998-2003) and as Vice Dean for Research for the School of Engineering and Applied Science (2010-2012). A leading scholar and researcher in the field of natural language processing, McKeown focuses her research on the use of data for societal problems; her interests include text summarization, question answering, natural language generation, social media analysis and multilingual applications. She has received numerous honors and awards, including 2023 IEEE Innovation in Societal Infrastructure Award, American Philosophical Society Elected member, American Academy of Arts and Science elected member, American Association of Artificial Intelligence Fellow, a Founding Fellow of the Association for Computational Linguistics and an Association for Computing Machinery Fellow. Early on she received the National Science Foundation Presidential Young Investigator Award, and a National Science Foundation Faculty Award for Women. In 2010, she won both the Columbia Great Teacher Award—an honor bestowed by the students—and the Anita Borg Woman of Vision Award for Innovation. Title: Multistakeholder fairness in recommender systems Robin Burke University of Colorado Boulder Abstract: Research in machine learning fairness makes two key simplifying assumptions that have proven challenging to move beyond. One assumption is that we can productively concentrate on a uni-dimensional version of the problem: achieving fairness for a single protected group defined by a single sensitive feature. The second assumption is that technical solutions need not engage with the essentially political nature of claims surrounding fairness. I argue that relaxing these assumptions is necessary for machine learning fairness to achieve practical utility. While some recent research in rich subgroup fairness has considered ways to relax the first assumption, these approaches require that fairness be defined in the same way for all groups, which amounts to a hardening of the second assumption. In this talk, I argue for a formulation of machine learning fairness based on social choice and exemplify the approach in the area of recommender systems. Social choice is inherently multi-agent, escaping the single group assumption and, in its classic formulation, places no constraints on agents' preferences. In addition, social choice was developed to formalize political decision-making mechanisms, such as elections, and therefore offers some hope of directly addressing the inherent politics of fairness. Social choice has complexities of its own, however, and the talk will outline a research agenda aimed at understanding the challenges and opportunities afforded by this approach to machine learning fairness. Bio: Information Science Department Chair and Professor Robin Burke conducts research in personalized recommender systems, a field he helped found and develop. His most recent projects explore fairness, accountability and transparency in recommendation through the integration of objectives from diverse stakeholders. Professor Burke is the author of more than 150 peer-reviewed articles in various areas of artificial intelligence including recommender systems, machine learning and information retrieval. His work has received support from the National Science Foundation, the National Endowment for the Humanities, the Fulbright Commission and the MacArthur Foundation, among others.
03/06/2024	Jon Cai, CU Boulder Computer Science, PhD proposal defense Title: Learning Fast and Slow with Semantics Abstract: Abstract Meaning Representation(AMR) is a linguistic formalism that capture and encode semantics of natural language. It is one of the most widely accepted implementation over the truth value based theory of meanings. The impact of AMR has broadened since its introduction from its original design objective to help machine translation to more NLP tasks such as information extraction, summarizations and multi-modality semantic alignments etc. Meanwhile, AMR serves as a theoretical tool for computational semantics researches to advance semantic theories. Being able to model holistic semantics thus become one of the ultimate goal for NLP and computational linguistics community. Despite the amazing advancement of LLMs in recent years, we still see gaps between shallow and deep semantic understanding of machine learning models. In this proposal, we go through the generalization issues that AMR parsing models renders and our proposed solutions over how could we design new methodologies and analytical tools to help us navigate the labyrinth of modeling semantics via AMR.
03/13/2024	Veronica Qing Lyu, Title:Faithful Chain of Thought Reasoning. ( https://aclanthology.org/2023.ijcnlp-main.20/ } Abstract: While Chain-of-Thought (CoT) prompting boosts Language Models' (LM) performance on a gamut of complex reasoning tasks, the generated reasoning chain does not necessarily reflect how the model arrives at the answer (aka. faithfulness). We propose Faithful CoT, a reasoning framework involving two stages: Translation (Natural Language query → symbolic reasoning chain) and Problem Solving (reasoning chain → answer), using an LM and a deterministic solver respectively. This guarantees that the reasoning chain provides a faithful explanation of the final answer. Aside from interpretability, Faithful CoT also improves empirical performance: it outperforms standard CoT on 9 of 10 benchmarks from 4 diverse domains, with a relative accuracy gain of 6.3% on Math Word Problems (MWP), 3.4% on Planning, 5.5% on Multi-hop Question Answering (QA), and 21.4% on Relational Inference. Furthermore, with GPT-4 and Codex, it sets the new state-of-the-art few-shot performance on 7 datasets (with 95.0+ accuracy on 6 of them), showing a strong synergy between faithfulness and accuracy. Bio: Veronica Qing Lyu is a fifth-year PhD student in Computer and Information Science at the University of Pennsylvania, advised by Chris Callison-Burch and Marianna Apidianaki. Her current research interests lie in the intersection of linguistics and natural language processing, explainable AI, and reasoning. Her paper "Faithful Chain-of-Thought Reasoning" received the Area Chair Award at IJCNLP-AACL 2023 (Interpretability and Analysis of Models for NLP track). She will co-organize a tutorial on “Explanations in the Era of Large Language Models” in NAACL 2024. Before Penn, she studied linguistics as an undergraduate student at the Department of Foreign Languages and Literatures at Tsinghua University.
03/20/2024	Jie's Practice Talk
03/27/2024	No Meeting - Spring Break
04/03/2024	CLASIC Industry Day
04/10/2024	Rehan's Dissertation Defense
04/17/2024	Maggie's Proposal
04/24/2024	Téa's Senior Thesis Defense
05/01/2024	Sagi's Proposal
05/08/2024	Mary's Prelim

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