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arXiv Machine Learning By Leomax Bandeira, Gabriel Aguiar, Dalton C\'ezane Gomes Valadares, Luiz Pereira, Helder Fernando de Ara\'ujo Oliveira, Gustavo Xavier, Andson M. Balieiro

A Large-Scale Dataset for Multi-Class Financial News Classification in Brazilian Portuguese

Read the original on arXiv Machine Learning →

The paper introduces a large corpus of about 160,000 Brazilian Portuguese financial news articles to support Natural Language Processing research in this domain. It presents initial benchmarks for a weakly supervised multi‑class classification task using semantic similarity, evaluating cosine similarity, K‑Nearest Neighbors (KNN), and FAISS‑based nearest‑neighbor search with multilingual embeddings. Results show that KNN performs best on manually labeled data (47.3% accuracy, 31.9% F1), while LLM‑annotated data yields similar accuracy but much lower F1 scores due to label imbalance and noise.

Machine-generated by The Flow from the publisher's headline and feed description — not written or checked by a human. The full article lives at arXiv Machine Learning.

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