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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

Recent topic models leverage pretrained embeddings, but neural architectures produce latent representations without grounding in specific texts, and clustering-based pipelines assign representative documents only post hoc, relying on absolute distances distorted by hubness and anisotropy in high-dimensional spaces. We...

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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