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Recommendation systems subject unit-1
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Recommender Systems Function, Recommendation Techniques, Recommender Systems as a Multi-Disciplinary Field, Challenges.
Basic Components of Content –Based Systems , Preprocessing and Feature Extraction, Learning User Profiles and Filtering, Nearest Neighbor Classification.
User-Based collaborative filtering , Similarity Function Variants, Variants of the Prediction Function, Item-Based Collaborative filtering , Comparing User-Based and Item-Based Methods, Strengths and Weaknesses of Neighborhood-Based Methods.
Rule-Based Collaborative Filtering , Association Rules, Naive Bayes Collaborative Filtering, Neural Network, Singular Value Decomposition, Stochastic Gradient Descent, Regularization.
General Goals of Evaluation Design: Accuracy, Coverage, Confidence and Trust, Novelty, Serendipity, Diversity, Scalability, Segmenting the Ratings for Training and Testing, Accuracy Metrics in Offline Evaluation.
Information Collection Phase Learning Phase Prediction/ Recommendation Phase
Incorporates contextual information (e.g., location, time, device) into the recommendations. Example: Recommending coffee shops nearby on a mobile app.
Relies on explicit knowledge about the domain and user requirements. Example: Travel websites that recommend destinations based on user-specified criteria like budget and climate.