Recommendation Engine Build recommendation systems for personalized content and product suggestions. Recommendation Approaches | Approach | How It Works | Pros | Cons | |----------|--------------|------|------| | Collaborative | User-item interactions | Discovers hidden patterns | Cold start | | Content-based | Item features | Works for new items | Limited discovery | | Hybrid | Combines both | Best of both | Complex | Collaborative Filtering Matrix Factorization (SVD) Hybrid Recommender Evaluation Metrics - Precision@K, Recall@K - NDCG (ranking quality) - Coverage (catalog diversity) - A/B t…