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Thiago César Castilho Almeida

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#artificial intelligence Preprint Aug 2026

A Manifold-Aware Topic Modeling Approach via Rank-Based Prototypes

This work introduces MARETopic, a training-free framework that casts topic discovery as rank-based prototype selection and leads topic coherence on two of three datasets, ahead of both neural and clustering-based topic models.

Thiago César Castilho Almeida, D. Pedronette · 0 citations
#machine learning Conference Open access Jun 2025

Effective Graph and Rank-based Contextual Embeddings for Textual and Multimedia Data

GRaCE surpasses RaDE and Original Features across diverse datasets, including textual and image collections, excelling in retrieval, classification, and clustering tasks, considering state-of-the-art Transformer models as feature descriptors and Graph Convolutional Networks models in classification tasks.

Thiago César Castilho Almeida, G. Leticio, L. P. Valem et al. · 1 citation · ⚡1

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