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+# Evaluation
+
+## Metrics
+
+| Metric | Purpose | Library |
+|--------|---------|---------|
+| Perplexity | LM quality | torch |
+| ROUGE | Summarization | rouge-score |
+| BLEU | Translation | nltk |
+| Accuracy | Exact match | sklearn |
+
+## Running
+
+Evaluation runs automatically after training, or standalone:
+
+```bash
+python -c "from src.evaluation.metrics import BwengeEvaluator; ..."
+```