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Alexander Ororbia

4 accepted papers

2025

SR-AIF: Solving Sparse-Reward Robotic Tasks From Pixels with Active Inference and World Models

ICRA 2025

Although research has produced promising results demonstrating the utility of active inference (AIF) in Markov decision processes (MDPs), there is relatively less work that builds AIF models in the context of environments and problems that take the form of partially observable Markov decision proces

Cited by 10SourceScholar
2023

Active Predictive Coding: Brain-Inspired Reinforcement Learning for Sparse Reward Robotic Control Problems

ICRA 2023poster

In this article, we propose a backpropagation-free approach to robotic control through the neuro-cognitive computational framework of neural generative coding (NGC), designing an agent completely built from predictive processing circuits that facilitate dynamic, online learning from sparse rewards,…

Cited by 23SourceScholar
2023

Disagreement Matters: Preserving Label Diversity by Jointly Modeling Item and Annotator Label Distributions with DisCo

ACL 2023findings

Annotator disagreement is common whenever human judgment is needed for supervised learning. It is conventional to assume that one label per item represents ground truth. However, this obscures minority opinions, if present. We regard “ground truth” as the distribution of all labels that a population…

Cited by 8SourcePDFScholar
2021

fBERT: A Neural Transformer for Identifying Offensive Content

EMNLP 2021finding

Transformer-based models such as BERT, XLNET, and XLM-R have achieved state-of-the-art performance across various NLP tasks including the identification of offensive language and hate speech, an important problem in social media. In this paper, we present fBERT, a BERT model retrained on SOLID, the…

Cited by 62SourcePDFScholar