RobustRAG: TF-IDF + Logistic Regression Baseline
Classical lexical baseline for hallucination detection on the RAGTruth benchmark.
Features: 437k unigram + bigram TF-IDF features with sublinear term frequency.
Accuracy: 76.78% | ROC-AUC: 0.7977 | PR-AUC: 0.7333 on RAGTruth test set.
