Search Results for author: Kristina Lerman

Found 50 papers, 21 papers with code

The Strong Pull of Prior Knowledge in Large Language Models and Its Impact on Emotion Recognition

no code implementations25 Mar 2024 Georgios Chochlakis, Alexandros Potamianos, Kristina Lerman, Shrikanth Narayanan

The promise of ICL is that the LLM can adapt to perform the present task at a competitive or state-of-the-art level at a fraction of the cost.

Emotion Recognition In-Context Learning

Don't Blame the Data, Blame the Model: Understanding Noise and Bias When Learning from Subjective Annotations

1 code implementation6 Mar 2024 Abhishek Anand, Negar Mokhberian, Prathyusha Naresh Kumar, Anweasha Saha, Zihao He, Ashwin Rao, Fred Morstatter, Kristina Lerman

Researchers have raised awareness about the harms of aggregating labels especially in subjective tasks that naturally contain disagreements among human annotators.

How Susceptible are Large Language Models to Ideological Manipulation?

1 code implementation18 Feb 2024 Kai Chen, Zihao He, Jun Yan, Taiwei Shi, Kristina Lerman

Large Language Models (LLMs) possess the potential to exert substantial influence on public perceptions and interactions with information.

Whose Emotions and Moral Sentiments Do Language Models Reflect?

no code implementations16 Feb 2024 Zihao He, Siyi Guo, Ashwin Rao, Kristina Lerman

We define the problem of affective alignment, which measures how LMs' emotional and moral tone represents those of different groups.

Hate Speech Detection

Reading Between the Tweets: Deciphering Ideological Stances of Interconnected Mixed-Ideology Communities

1 code implementation2 Feb 2024 Zihao He, Ashwin Rao, Siyi Guo, Negar Mokhberian, Kristina Lerman

Recent advances in NLP have improved our ability to understand the nuanced worldviews of online communities.

Characterizing Online Eating Disorder Communities with Large Language Models

no code implementations17 Jan 2024 Minh Duc Chu, Aryan Karnati, Zihao He, Kristina Lerman

We argue that social media platforms create a feedback loop that amplifies the growth of content and communities that promote eating disorders like anorexia and bulimia.

Capturing Perspectives of Crowdsourced Annotators in Subjective Learning Tasks

no code implementations16 Nov 2023 Negar Mokhberian, Myrl G. Marmarelis, Frederic R. Hopp, Valerio Basile, Fred Morstatter, Kristina Lerman

Previous studies have shed light on the pitfalls of label aggregation and have introduced a handful of practical approaches to tackle this issue.

Classification

CPL-NoViD: Context-Aware Prompt-based Learning for Norm Violation Detection in Online Communities

1 code implementation16 May 2023 Zihao He, Jonathan May, Kristina Lerman

Detecting norm violations in online communities is critical to maintaining healthy and safe spaces for online discussions.

Few-Shot Learning

A Data Fusion Framework for Multi-Domain Morality Learning

no code implementations4 Apr 2023 Siyi Guo, Negar Mokhberian, Kristina Lerman

Language models can be trained to recognize the moral sentiment of text, creating new opportunities to study the role of morality in human life.

Data-Driven Estimation of Heterogeneous Treatment Effects

no code implementations16 Jan 2023 Christopher Tran, Keith Burghardt, Kristina Lerman, Elena Zheleva

In this work, we provide a survey of state-of-the-art data-driven methods for heterogeneous treatment effect estimation using machine learning, broadly categorizing them as methods that focus on counterfactual prediction and methods that directly estimate the causal effect.

counterfactual

ALCAP: Alignment-Augmented Music Captioner

1 code implementation21 Dec 2022 Zihao He, Weituo Hao, Wei-Tsung Lu, Changyou Chen, Kristina Lerman, Xuchen Song

Music captioning has gained significant attention in the wake of the rising prominence of streaming media platforms.

Contrastive Learning Music Captioning +1

Anger Breeds Controversy: Analyzing Controversy and Emotions on Reddit

no code implementations1 Dec 2022 Kai Chen, Zihao He, Rong-Ching Chang, Jonathan May, Kristina Lerman

We collect discussions from a wide variety of topical forums and use emotion detection to recognize a range of emotions from text, including anger, fear, joy, admiration, etc.

Using Emotion Embeddings to Transfer Knowledge Between Emotions, Languages, and Annotation Formats

1 code implementation31 Oct 2022 Georgios Chochlakis, Gireesh Mahajan, Sabyasachee Baruah, Keith Burghardt, Kristina Lerman, Shrikanth Narayanan

In this work, we study how we can build a single model that can transition between these different configurations by leveraging multilingual models and Demux, a transformer-based model whose input includes the emotions of interest, enabling us to dynamically change the emotions predicted by the model.

Emotion Recognition

Leveraging Label Correlations in a Multi-label Setting: A Case Study in Emotion

1 code implementation28 Oct 2022 Georgios Chochlakis, Gireesh Mahajan, Sabyasachee Baruah, Keith Burghardt, Kristina Lerman, Shrikanth Narayanan

First, we develop two modeling approaches to the problem in order to capture word associations of the emotion words themselves, by either including the emotions in the input, or by leveraging Masked Language Modeling (MLM).

Emotion Recognition Language Modelling +1

Noise Audits Improve Moral Foundation Classification

no code implementations13 Oct 2022 Negar Mokhberian, Frederic R. Hopp, Bahareh Harandizadeh, Fred Morstatter, Kristina Lerman

Morality classification relies on human annotators to label the moral expressions in text, which provides training data to achieve state-of-the-art performance.

Classification Cultural Vocal Bursts Intensity Prediction

Zero-shot meta-learning for small-scale data from human subjects

no code implementations29 Mar 2022 Julie Jiang, Kristina Lerman, Emilio Ferrara

While developments in machine learning led to impressive performance gains on big data, many human subjects data are, in actuality, small and sparsely labeled.

Meta-Learning Zero-Shot Learning

Emergent Instabilities in Algorithmic Feedback Loops

1 code implementation18 Jan 2022 Keith Burghardt, Kristina Lerman

In this work, we explore algorithmic confounding in collaborative filtering-based recommendation algorithms through teacher-student learning simulations.

Collaborative Filtering Recommendation Systems

DoGR: Disaggregated Gaussian Regression for Reproducible Analysis of Heterogeneous Data

1 code implementation31 Aug 2021 Nazanin Alipourfard, Keith Burghardt, Kristina Lerman

Quantitative analysis of large-scale data is often complicated by the presence of diverse subgroups, which reduce the accuracy of inferences they make on held-out data.

regression

Pattern Discovery in Time Series with Byte Pair Encoding

no code implementations30 May 2021 Nazgol Tavabi, Kristina Lerman

The growing popularity of wearable sensors has generated large quantities of temporal physiological and activity data.

Time Series Time Series Analysis

Individualized Context-Aware Tensor Factorization for Online Games Predictions

no code implementations22 Feb 2021 Julie Jiang, Kristina Lerman, Emilio Ferrara

Individual behavior and decisions are substantially influenced by their contexts, such as location, environment, and time.

Inherent Trade-offs in the Fair Allocation of Treatments

no code implementations30 Oct 2020 Yuzi He, Keith Burghardt, Siyi Guo, Kristina Lerman

Explicit and implicit bias clouds human judgement, leading to discriminatory treatment of minority groups.

Fairness

Origins of Algorithmic Instabilities in Crowdsourced Ranking

no code implementations23 Oct 2020 Keith Burghardt, Tad Hogg, Raissa M. D'Souza, Kristina Lerman, Marton Posfai

We use this data to construct a model that quantifies how judgement heuristics and option quality combine when deciding between two options.

Social and Information Networks Human-Computer Interaction

TILES-2018, a longitudinal physiologic and behavioral data set of hospital workers

no code implementations18 Mar 2020 Karel Mundnich, Brandon M. Booth, Michelle L'Hommedieu, Tiantian Feng, Benjamin Girault, Justin L'Hommedieu, Mackenzie Wildman, Sophia Skaaden, Amrutha Nadarajan, Jennifer L. Villatte, Tiago H. Falk, Kristina Lerman, Emilio Ferrara, Shrikanth Narayanan

We designed the study to investigate the use of off-the-shelf wearable and environmental sensors to understand individual-specific constructs such as job performance, interpersonal interaction, and well-being of hospital workers over time in their natural day-to-day job settings.

Privacy Preserving

COVID-19: The First Public Coronavirus Twitter Dataset

7 code implementations16 Mar 2020 Emily Chen, Kristina Lerman, Emilio Ferrara

At the time of this writing, the novel coronavirus (COVID-19) pandemic outbreak has already put tremendous strain on many countries' citizens, resources and economies around the world.

Social and Information Networks Populations and Evolution

Learning Behavioral Representations from Wearable Sensors

no code implementations16 Nov 2019 Nazgol Tavabi, Homa Hosseinmardi, Jennifer L. Villatte, Andrés Abeliuk, Shrikanth Narayanan, Emilio Ferrara, Kristina Lerman

Continuous collection of physiological data from wearable sensors enables temporal characterization of individual behaviors.

Learning Fair and Interpretable Representations via Linear Orthogonalization

1 code implementation28 Oct 2019 Yuzi He, Keith Burghardt, Kristina Lerman

To reduce human error and prejudice, many high-stakes decisions have been turned over to machine algorithms.

Fairness

Follow the Leader: Documents on the Leading Edge of Semantic Change Get More Citations

1 code implementation9 Sep 2019 Sandeep Soni, Kristina Lerman, Jacob Eisenstein

However, simply knowing that a word has changed in meaning is insufficient to identify the instances of word usage that convey the historical or the newer meaning.

Diachronic Word Embeddings Word Embeddings

A Survey on Bias and Fairness in Machine Learning

2 code implementations23 Aug 2019 Ninareh Mehrabi, Fred Morstatter, Nripsuta Saxena, Kristina Lerman, Aram Galstyan

With the commercialization of these systems, researchers are becoming aware of the biases that these applications can contain and have attempted to address them.

BIG-bench Machine Learning Fairness

Discovering Hidden Structure in High Dimensional Human Behavioral Data via Tensor Factorization

no code implementations21 May 2019 Homa Hosseinmardi, Hsien-Te Kao, Kristina Lerman, Emilio Ferrara

In recent years, the rapid growth in technology has increased the opportunity for longitudinal human behavioral studies.

Friendship Paradox Biases Perceptions in Directed Networks

1 code implementation13 May 2019 Nazanin Alipourfard, Buddhika Nettasinghe, Andres Abeliuk, Vikram Krishnamurthy, Kristina Lerman

For example, in an online network of a social media platform, the number of people who mention a topic in their posts---i. e., its global popularity---can be dramatically different from how people see it in their social feeds---i. e., its perceived popularity---where the feeds aggregate their friends' posts.

Social and Information Networks Physics and Society

Characterizing Activity on the Deep and Dark Web

no code implementations1 Mar 2019 Nazgol Tavabi, Nathan Bartley, Andrés Abeliuk, Sandeep Soni, Emilio Ferrara, Kristina Lerman

The deep and darkweb (d2web) refers to limited access web sites that require registration, authentication, or more complex encryption protocols to access them.

Tensor Embedding: A Supervised Framework for Human Behavioral Data Mining and Prediction

no code implementations31 Aug 2018 Homa Hosseinmardi, Amir Ghasemian, Shrikanth Narayanan, Kristina Lerman, Emilio Ferrara

Today's densely instrumented world offers tremendous opportunities for continuous acquisition and analysis of multimodal sensor data providing temporal characterization of an individual's behaviors.

Using Simpson's Paradox to Discover Interesting Patterns in Behavioral Data

1 code implementation8 May 2018 Nazanin Alipourfard, Peter G. Fennell, Kristina Lerman

We describe a data-driven discovery method that leverages Simpson's paradox to uncover interesting patterns in behavioral data.

Can you Trust the Trend: Discovering Simpson's Paradoxes in Social Data

2 code implementations13 Jan 2018 Nazanin Alipourfard, Peter G. Fennell, Kristina Lerman

We present a statistical method to automatically identify Simpson's paradox in data by comparing statistical trends in the aggregate data to those in the disaggregated subgroups.

Computers and Society

Network Vector: Distributed Representations of Networks with Global Context

no code implementations7 Sep 2017 Hao Wu, Kristina Lerman

We propose a neural embedding algorithm called Network Vector, which learns distributed representations of nodes and the entire networks simultaneously.

General Classification Node Classification

The Myopia of Crowds: A Study of Collective Evaluation on Stack Exchange

no code implementations24 Feb 2016 Keith Burghardt, Emanuel F. Alsina, Michelle Girvan, William Rand, Kristina Lerman

Our results suggest that, rather than evaluate all available answers to a question, users rely on simple cognitive heuristics to choose an answer to vote for or accept.

Question Answering

The DARPA Twitter Bot Challenge

no code implementations20 Jan 2016 V. S. Subrahmanian, Amos Azaria, Skylar Durst, Vadim Kagan, Aram Galstyan, Kristina Lerman, Linhong Zhu, Emilio Ferrara, Alessandro Flammini, Filippo Menczer, Andrew Stevens, Alexander Dekhtyar, Shuyang Gao, Tad Hogg, Farshad Kooti, Yan Liu, Onur Varol, Prashant Shiralkar, Vinod Vydiswaran, Qiaozhu Mei, Tim Hwang

A number of organizations ranging from terrorist groups such as ISIS to politicians and nation states reportedly conduct explicit campaigns to influence opinion on social media, posing a risk to democratic processes.

Portrait of an Online Shopper: Understanding and Predicting Consumer Behavior

no code implementations15 Dec 2015 Farshad Kooti, Kristina Lerman, Luca Maria Aiello, Mihajlo Grbovic, Nemanja Djuric, Vladan Radosavljevic

Linking online shopping to income, we find that shoppers from more affluent areas purchase more expensive items and buy them more frequently, resulting in significantly more money spent on online purchases.

Social and Information Networks Computers and Society

Tripartite Graph Clustering for Dynamic Sentiment Analysis on Social Media

no code implementations24 Feb 2014 Linhong Zhu, Aram Galstyan, James Cheng, Kristina Lerman

We further investigate the evolution of user-level sentiments and latent feature vectors in an online framework and devise an efficient online algorithm to sequentially update the clustering of tweets, users and features with newly arrived data.

Clustering Graph Clustering +1

Spectral Clustering with Epidemic Diffusion

no code implementations11 Mar 2013 Laura M. Smith, Kristina Lerman, Cristina Garcia-Cardona, Allon G. Percus, Rumi Ghosh

Existing methods for spectral clustering use the eigenvalues and eigenvectors of the graph Laplacian, an operator that is closely associated with random walks on graphs.

Clustering

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