Portrait de Shahrad Mohammadzadeh

Shahrad Mohammadzadeh

Maîtrise recherche - McGill
Superviseur⋅e principal⋅e
Reihaneh Rabbany
Co-supervisor
Doina Precup
Sujets de recherche
Apprentissage de représentations
Apprentissage multimodal
Apprentissage par renforcement
Apprentissage profond
Raisonnement
Réseaux de neurones en graphes
Systèmes de recommandation
Traitement du langage naturel
Site web
Google Scholar
GitHub

Publications

AIF-GEN: Open-Source Platform and Synthetic Dataset Suite for Reinforcement Learning on Large Language Models
Jacob Chmura
Shahrad Mohammadzadeh
Ivan Anokhin
Jacob-Junqi Tian
Mandana Samiei
Taz Scott-Talib
Irina Rish
Doina Precup
Reihaneh Rabbany
Nishanth Anand
2025-06-08
CODEML @ International Conference on Machine Learning (publié)
openreview.net
openreview.net
Hallucination Detox: Sensitivity Dropout (SenD) for Large Language Model Training
Shahrad Mohammadzadeh
Juan David Guerra
Marco Bonizzato
Reihaneh Rabbany
Golnoosh Farnadi
As large language models (LLMs) become increasingly prevalent, concerns about their reliability, particularly due to hallucinations - factua… (voir plus)lly inaccurate or irrelevant outputs - have grown. Our research investigates the relationship between the uncertainty in training dynamics and the emergence of hallucinations. Using models from the Pythia suite and several hallucination detection metrics, we analyze hallucination trends and identify significant variance during training. To address this, we propose Sensitivity Dropout (SenD), a novel training protocol designed to reduce hallucination variance during training by deterministically dropping embedding indices with significant variability. In addition, we develop an unsupervised hallucination detection metric, Efficient EigenScore (EES), which approximates the traditional EigenScore in 2x speed. This metric is integrated into our training protocol, allowing SenD to be both computationally scalable and effective at reducing hallucination variance. SenD improves test-time reliability of Pythia and Meta's Llama models by up to 17% and enhances factual accuracy in Wikipedia, Medical, Legal, and Coding domains without affecting downstream task performance.
2024-12-31
Association for Computational Linguistics (publié)
doi.org
openreview.net
Epistemic Integrity in Large Language Models
Bijean Ghafouri
Shahrad Mohammadzadeh
James Zhou
Pratheeksha Nair
Jacob-Junqi Tian
Mayank Goel
Reihaneh Rabbany
Jean-François Godbout
Kellin Pelrine
Large language models are increasingly relied upon as sources of information, but their propensity for generating false or misleading statem… (voir plus)ents with high confidence poses risks for users and society. In this paper, we confront the critical problem of epistemic miscalibration—where a model's linguistic assertiveness fails to reflect its true internal certainty. We introduce a new human-labeled dataset and a novel method for measuring the linguistic assertiveness of Large Language Models which cuts error rates by over 50% relative to previous benchmarks. Validated across multiple datasets, our method reveals a stark misalignment between how confidently models linguistically present information and their actual accuracy. Further human evaluations confirm the severity of this miscalibration. This evidence underscores the urgent risk of the overstated certainty Large Language Models hold which may mislead users on a massive scale. Our framework provides a crucial step forward in diagnosing and correcting this miscalibration, offering a path to safer and more trustworthy AI across domains.
2024-10-11
NeurIPS.cc/2024/Workshop/SafeGenAi (poster)
doi.org
openreview.net