31. [Exercise] Improve the Quality of Similiar Movies

LEARNING ACTIVITY

Exercise

• Improve the results! Some ideas to try:

  • Discard bad ratings - only recommend good movies

  • Try different similarity metrics (Pearson Correlation Coefficient, Jaccard Coefficient, Conditional Probability)

  • Adjust the thresholds for minimum co-raters or minimum score

  • Invent a new similarity metric that takes the number of co-raters into account

  • Use genre information in u.items to boost scores from movies in the same genre