Search Results for author: Raha Moraffah

Found 22 papers, 5 papers with code

Linked Causal Variational Autoencoder for Inferring Paired Spillover Effects

1 code implementation9 Aug 2018 Vineeth Rakesh, Ruocheng Guo, Raha Moraffah, Nitin Agarwal, Huan Liu

Modeling spillover effects from observational data is an important problem in economics, business, and other fields of research.

Variational Inference

Deep causal representation learning for unsupervised domain adaptation

no code implementations28 Oct 2019 Raha Moraffah, Kai Shu, Adrienne Raglin, Huan Liu

Recent research on deep domain adaptation proposed to mitigate this problem by forcing the deep model to learn more transferable feature representations across domains.

Representation Learning Unsupervised Domain Adaptation

Use of Bayesian Nonparametric methods for Estimating the Measurements in High Clutter

no code implementations30 Nov 2020 Bahman Moraffah, Christ Richmond, Raha Moraffah, Antonia Papandreou-Suppappola

We robustly and accurately estimate the trajectory of the moving target in a high clutter environment with an unknown number of clutters by employing Bayesian nonparametric modeling.

Causal Inference for Time series Analysis: Problems, Methods and Evaluation

no code implementations11 Feb 2021 Raha Moraffah, Paras Sheth, Mansooreh Karami, Anchit Bhattacharya, Qianru Wang, Anique Tahir, Adrienne Raglin, Huan Liu

In this paper, we focus on two causal inference tasks, i. e., treatment effect estimation and causal discovery for time series data, and provide a comprehensive review of the approaches in each task.

Causal Discovery Causal Inference +3

Evaluation Methods and Measures for Causal Learning Algorithms

no code implementations7 Feb 2022 Lu Cheng, Ruocheng Guo, Raha Moraffah, Paras Sheth, K. Selcuk Candan, Huan Liu

To bridge from conventional causal inference (i. e., based on statistical methods) to causal learning with big data (i. e., the intersection of causal inference and machine learning), in this survey, we review commonly-used datasets, evaluation methods, and measures for causal learning using an evaluation pipeline similar to conventional machine learning.

Benchmarking BIG-bench Machine Learning +1

PEACE: Cross-Platform Hate Speech Detection- A Causality-guided Framework

1 code implementation15 Jun 2023 Paras Sheth, Tharindu Kumarage, Raha Moraffah, Aman Chadha, Huan Liu

Hate speech detection refers to the task of detecting hateful content that aims at denigrating an individual or a group based on their religion, gender, sexual orientation, or other characteristics.

Hate Speech Detection

Causality Guided Disentanglement for Cross-Platform Hate Speech Detection

1 code implementation3 Aug 2023 Paras Sheth, Tharindu Kumarage, Raha Moraffah, Aman Chadha, Huan Liu

By disentangling input into platform-dependent features (useful for predicting hate targets) and platform-independent features (used to predict the presence of hate), we learn invariant representations resistant to distribution shifts.

Disentanglement Hate Speech Detection

ConDA: Contrastive Domain Adaptation for AI-generated Text Detection

1 code implementation7 Sep 2023 Amrita Bhattacharjee, Tharindu Kumarage, Raha Moraffah, Huan Liu

Given the potential malicious nature in which these LLMs can be used to generate disinformation at scale, it is important to build effective detectors for such AI-generated text.

Contrastive Learning Text Detection +1

Towards LLM-guided Causal Explainability for Black-box Text Classifiers

no code implementations23 Sep 2023 Amrita Bhattacharjee, Raha Moraffah, Joshua Garland, Huan Liu

Inspired by recent endeavors to utilize Large Language Models (LLMs) as experts, in this work, we aim to leverage the instruction-following and textual understanding capabilities of recent state-of-the-art LLMs to facilitate causal explainability via counterfactual explanation generation for black-box text classifiers.

counterfactual Counterfactual Explanation +6

How Reliable Are AI-Generated-Text Detectors? An Assessment Framework Using Evasive Soft Prompts

no code implementations8 Oct 2023 Tharindu Kumarage, Paras Sheth, Raha Moraffah, Joshua Garland, Huan Liu

The novel universal evasive prompt is achieved in two steps: First, we create an evasive soft prompt tailored to a specific PLM through prompt tuning; and then, we leverage the transferability of soft prompts to transfer the learned evasive soft prompt from one PLM to another.

A Generative Approach to Surrogate-based Black-box Attacks

no code implementations5 Feb 2024 Raha Moraffah, Huan Liu

Different from the discriminative approach, we propose a generative surrogate that learns the distribution of samples residing on or close to the target's decision boundaries.

Causal Feature Selection for Responsible Machine Learning

no code implementations5 Feb 2024 Raha Moraffah, Paras Sheth, Saketh Vishnubhatla, Huan Liu

This survey focuses on the current study of causal feature selection: what it is and how it can reinforce the four aspects of responsible ML.

Adversarial Robustness Domain Generalization +2

Exploiting Class Probabilities for Black-box Sentence-level Attacks

no code implementations5 Feb 2024 Raha Moraffah, Huan Liu

Sentence-level attacks craft adversarial sentences that are synonymous with correctly-classified sentences but are misclassified by the text classifiers.

Sentence

Adversarial Text Purification: A Large Language Model Approach for Defense

no code implementations5 Feb 2024 Raha Moraffah, Shubh Khandelwal, Amrita Bhattacharjee, Huan Liu

Adversarial purification is a defense mechanism for safeguarding classifiers against adversarial attacks without knowing the type of attacks or training of the classifier.

Adversarial Text Language Modelling +2

The Wolf Within: Covert Injection of Malice into MLLM Societies via an MLLM Operative

1 code implementation20 Feb 2024 Zhen Tan, Chengshuai Zhao, Raha Moraffah, YiFan Li, Yu Kong, Tianlong Chen, Huan Liu

Unlike direct harmful output generation for MLLMs, our research demonstrates how a single MLLM agent can be subtly influenced to generate prompts that, in turn, induce other MLLM agents in the society to output malicious content.

Misinformation

EAGLE: A Domain Generalization Framework for AI-generated Text Detection

no code implementations23 Mar 2024 Amrita Bhattacharjee, Raha Moraffah, Joshua Garland, Huan Liu

With the advancement in capabilities of Large Language Models (LLMs), one major step in the responsible and safe use of such LLMs is to be able to detect text generated by these models.

Contrastive Learning Domain Generalization +1

Cross-Platform Hate Speech Detection with Weakly Supervised Causal Disentanglement

no code implementations17 Apr 2024 Paras Sheth, Tharindu Kumarage, Raha Moraffah, Aman Chadha, Huan Liu

Content moderation faces a challenging task as social media's ability to spread hate speech contrasts with its role in promoting global connectivity.

Disentanglement Hate Speech Detection

Cannot find the paper you are looking for? You can Submit a new open access paper.