[r/ML] [D] Training a classifier entirely in SQL (no iterative optimization)

Summary

A new lightweight linear classifier, SEFR, has been implemented entirely in SQL (Google BigQuery), offering a fully parallelizable approach without iterative optimization. Benchmarked against Logistic Regression on a fraud detection dataset, SEFR achieved an AUC of 0.954, slightly lower than Logistic Regression's 0.986. However, SEFR demonstrated a significant speed advantage, being approximately 18 times faster.

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