93 items
Popularity-Based Baseline Recommenders
Slides / VideoPopularity Bias and Filter Bubbles
Slides / VideoDiversity, Novelty, and Serendipity
Slides / VideoRanking vs Rating Prediction
Slides / VideoEvaluation Metrics for Recommenders
Slides / VideoSparsity and Scalability Challenges
Slides / VideoThe Cold Start Problem
Slides / VideoHybrid Recommender Systems
Slides / VideoMatrix Factorization and Latent Factors
Slides / VideoSimilarity Measures: Cosine and Pearson
Slides / VideoExplicit vs Implicit Feedback
Slides / VideoThe User-Item Interaction Matrix
Slides / VideoUser-Based vs Item-Based Filtering
Slides / VideoWhat a Recommender System Is
Slides / VideoCollaborative Filtering Overview
Slides / VideoContent-Based Filtering Basics
Slides / VideoReal-World Applications of Recommender Systems
Slides / VideoBuilding an Implicit Feedback Matrix
Code QuizBuilding a CSR Sparse Matrix
Code QuizPrecision@K Denominator
Code QuizAverage Precision Rank Index
Code QuizDCG Log Discount
Code QuizRecall@K Denominator
Code QuizCatalog Coverage Denominator
Code QuizWeighted Hybrid Score Blend
Code QuizRanking vs Rating Prediction
QuizKnowledge-Based Recommendations
QuizHybrid Recommender Systems
QuizCollaborative Filtering Overview
QuizNeighborhood vs Model-Based Methods
QuizScalability in Recommenders
QuizPopularity-Based Baselines
QuizRanking Metrics (NDCG, MAP, MRR)
QuizSimilarity Measures (Cosine, Pearson)
QuizExplicit vs Implicit Feedback
QuizContent-Based Filtering
QuizThe Cold-Start Problem
QuizDiversity, Novelty, and Serendipity
QuizEvaluating Recommenders (Precision@K, Recall@K)
QuizUser-Item Interaction Matrix
QuizItem-Based Collaborative Filtering
QuizFilter Bubbles and Feedback Loops
QuizUser-Based Collaborative Filtering
QuizMatrix Factorization for Recommendations
QuizCandidate Generation and Ranking Stages
QuizLatent Factors in Recommendations
QuizOffline vs Online Evaluation
QuizContext-Aware Recommendations
QuizWhat a Recommender System Is
QuizData Sparsity Challenge
QuizDeep Learning for Recommendations
QuizBPR Ranking Loss Direction
Code QuizMissing vs Zero Ratings in Average
Code QuizBuilding a User Profile
Code QuizFiltering Already-Seen Items
Code QuizTop-N Recommendation Ranking
Code QuizContent-Based Cosine Similarity
Code QuizBias Terms in MF Prediction
Code QuizRegularization in Matrix Factorization
Code QuizPopularity-Based Baseline
Code QuizCold-Start Fallback Logic
Code QuizSGD Update for Latent Factors
Code QuizMatrix Factorization Prediction
Code QuizWeighted Rating Aggregation
Code QuizMean-Centering Ratings
Code QuizSelecting the K Nearest Neighbors
Code QuizItem-Based CF Prediction
Code QuizUser-Based CF Prediction
Code QuizBuilding the User-Item Matrix
Code QuizReal-World Applications of Recommenders
FlashcardContext-Aware and Session-Based Recommendations
FlashcardPopularity-Based / Baseline Recommenders
FlashcardPrecision@K and Recall@K
FlashcardFilter Bubbles and Feedback Loops
FlashcardNeighborhood-Based Methods
FlashcardScalability Challenges in Recommenders
FlashcardRanking Metrics: NDCG, MAP, MRR
FlashcardDeep Learning-Based Recommenders
FlashcardCandidate Generation vs Ranking
FlashcardDiversity, Novelty, and Serendipity
FlashcardSimilarity Measures for Recommendations
FlashcardCold Start Problem
FlashcardMatrix Factorization
FlashcardData Sparsity in Recommenders
FlashcardLatent Factors and Embeddings
FlashcardUser-Item Interaction Matrix
FlashcardHybrid Recommender Systems
FlashcardItem-Based Collaborative Filtering
FlashcardCollaborative Filtering Overview
FlashcardWhat is a Recommender System
FlashcardExplicit vs Implicit Feedback
FlashcardUser-Based Collaborative Filtering
FlashcardContent-Based Filtering
FlashcardBuilding the User-Item Matrix
Spot the indexing mistake when filling a user-item interaction matrix.
import numpy as np
def build_matrix(interactions, n_users, n_items):
M = np.zeros((n_users, n_items))
for user, item, rating in interactions:
M[item][user] = rating
return MWhat is the bug in this matrix construction code?