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Jul 23, 2026My Take on Prompt Engineering and Major AI ModelsA pragmatic look at prompt engineering — techniques that outlive model churn — plus a date-stamped model corner: the 2026 takes up front, the September 2025 snapshot frozen below.essayMay 08, 2025Regression Model Evaluation Metrics: MAE, MSE, RMSE, and R² ExplainedA quick reference for regression evaluation metrics: what MAE, MSE, RMSE, and R² each measure, when to reach for which, and where they break down.note