Your AI Metrics Are LYING: Evaluation & Prompt Engineering Explained

Описание: A 99.9% accuracy score... that catches ZERO real cases. A perfect BLEU score... that produces gibberish. What if your AI metrics have been lying to you?

In this visual explainer, we break down every major evaluation metric — from Precision & Recall to BLEU & ROUGE — revealing when each one LIES. Then we explore prompt engineering, the revolutionary technique where changing HOW you ask can swing performance by 50%.

⏱️ TIMESTAMPS:
0:00 — The BLEU score that lied
0:15 — Why you need to watch this
0:45 — The two worlds of evaluation
1:30 — Chapter 1: Classification Metrics (Accuracy, Precision, Recall, F1)
3:00 — Chapter 2: Generation Metrics (BLEU, ROUGE, METEOR, Perplexity)
4:15 — Chapter 3: Prompt Engineering (Zero-Shot, Few-Shot, Instruction)
5:00 — THE TWIST: Chain-of-Thought & Goodhart's Law
6:30 — The Modern Evaluation Framework
7:00 — Unit 2 Complete — Your Journey So Far
7:30 — Next: Unit 3 — Advanced NLP Techniques

🔑 KEY CONCEPTS COVERED:
• Confusion Matrix — TP, FP, FN, TN explained visually
• Accuracy Trap — why 99.9% can mean nothing
• Precision vs Recall trade-off
• F1 Score — the harmonic mean
• BLEU — n-gram precision for translation
• ROUGE — recall for summarization
• METEOR — synonym-aware evaluation
• Perplexity — language model confidence
• Zero-Shot, Few-Shot, Instruction Prompting
• Chain-of-Thought (CoT) — "Let's think step by step"
• Goodhart's Law — when metrics become targets
• Modern Evaluation: Metrics + Human Ratings + Adversarial Testing

📚 This is Video 6 of Unit 2: Deep Learning for NLP (UNIT 2 FINALE)
Full playlist:   • Fundamentals & Advanced NLP –  Playlist  

Part of the complete AI/ML educational series:
• Unit 1: ML Foundations ✅
• Unit 2: Deep Learning for NLP ✅ (COMPLETE!)
• Unit 3: Advanced NLP Techniques (NEXT)
• Unit 4: Multimodal NLP & Ethics

🔗 RESOURCES:
• Papineni et al. (2002) — BLEU Score Paper
• Lin (2004) — ROUGE Paper
• Wei et al. (2022) — Chain-of-Thought Prompting
• Kojima et al. (2022) — "Let's Think Step by Step" (Zero-Shot CoT)

#ai #MachineLearning #PromptEngineering #NLP #BLEU #ROUGE #ChainOfThought #AIMetrics #Evaluation #DeepLearning