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Lucian Popa

12 accepted papers

2026

Constraint-Guided Clustering for Identifying in-Vehicle Electronic Control Units from Voltage Data

AAAI 2026technical

Identifying in-vehicle electronic control units based on voltage characteristics has been the subject of extensive research in cybersecurity. However, the results reported so far generally depend on restricted datasets and supervised learning. In this work, we show that clustering, i.e., unsupervise

Cited by 0SourcePDFScholar
2025

Activated LoRA: Fine-tuned LLMs for Intrinsics

NeurIPS 2025poster

Low-Rank Adaptation (LoRA) has emerged as a highly efficient framework for finetuning the weights of large foundation models, and has become the go-to method for data-driven customization of LLMs. Despite the promise of highly customized behaviors and capabilities, switching between relevant LoRAs i…

Cited by 0SourcecodeScholar
2025

DELIFT: Data Efficient Language model Instruction Fine-Tuning

ICLR 2025poster

Fine-tuning large language models (LLMs) is crucial for task specialization but often becomes resource-intensive due to redundant or uninformative data. Existing data selection methods typically rely either on computationally expensive gradient-based metrics or static embeddings that fail to adapt d…

2025

Identifying Noise in Human-Created Datasets using Training Dynamics from Generative Models

EMNLP 2025

Instruction fine-tuning enhances the alignment of autoregressive language models (ArLMs) with human intent but relies on large-scale annotated datasets prone to label and text noise. In this paper, we show that existing noise detection techniques designed for autoencoder models (AeLMs) do not direct

Cited by 0SourcePDFScholar
2024

ConTReGen: Context-driven Tree-structured Retrieval for Open-domain Long-form Text Generation

EMNLP 2024finding

Open-domain long-form text generation requires generating coherent, comprehensive responses that address complex queries with both breadth and depth. This task is challenging due to the need to accurately capture diverse facets of input queries. Existing iterative retrieval-augmented generation (RAG…

Cited by 1SourcePDFScholar
2024

Seed-Guided Fine-Grained Entity Typing in Science and Engineering Domains

AAAI 2024technical

Accurately typing entity mentions from text segments is a fundamental task for various natural language processing applications. Many previous approaches rely on massive human-annotated data to perform entity typing. Nevertheless, collecting such data in highly specialized science and engineering do…

2023

Are Human Explanations Always Helpful? Towards Objective Evaluation of Human Natural Language Explanations

ACL 2023long

Human-annotated labels and explanations are critical for training explainable NLP models. However, unlike human-annotated labels whose quality is easier to calibrate (e.g., with a majority vote), human-crafted free-form explanations can be quite subjective. Before blindly using them as ground truth…

Cited by 16SourcePDFScholar
2023

Beyond Labels: Empowering Human Annotators with Natural Language Explanations through a Novel Active-Learning Architecture

EMNLP 2023long findings

Real-world domain experts (e.g., doctors) rarely annotate only a decision label in their day-to-day workflow without providing explanations. Yet, existing low-resource learning techniques, such as Active Learning (AL), that aim to support human annotators mostly focus on the label while neglecting t…

Cited by 0SourcecodeScholar
2022

AUTOMATA: Gradient Based Data Subset Selection for Compute-Efficient Hyper-parameter Tuning

NeurIPS 2022accept

Deep neural networks have seen great success in recent years; however, training a deep model is often challenging as its performance heavily depends on the hyper-parameters used. In addition, finding the optimal hyper-parameter configuration, even with state-of-the-art (SOTA) hyper-parameter optimiz…

2022

Domain Representative Keywords Selection: A Probabilistic Approach

ACL 2022findings

We propose a probabilistic approach to select a subset of a target domain representative keywords from a candidate set, contrasting with a context domain. Such a task is crucial for many downstream tasks in natural language processing. To contrast the target domain and the context domain, we adapt t…

2022

Learning to Robustly Aggregate Labeling Functions for Semi-supervised Data Programming

ACL 2022findings

A critical bottleneck in supervised machine learning is the need for large amounts of labeled data which is expensive and time-consuming to obtain. Although a small amount of labeled data cannot be used to train a model, it can be used effectively for the generation of humaninterpretable labeling fu…

2021

LNN-EL: A Neuro-Symbolic Approach to Short-text Entity Linking

ACL 2021long

Entity linking (EL) is the task of disambiguating mentions appearing in text by linking them to entities in a knowledge graph, a crucial task for text understanding, question answering or conversational systems. In the special case of short-text EL, which poses additional challenges due to limited c…