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A Quick Tutorial on Mahout’s Recommendation Engine (v 0.4)

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Jee Vang, Ph.D.
Jee Vang, Ph.D.

Mahout is a machine learning API built on Hadoop that includes recommender algorithms. Mahout's recommendation engine transforms input data into predicted recommendations using a series of MapReduce phases. It first creates user preference vectors and item similarity matrices, then performs partial matrix multiplications to calculate item recommendations for each user. The final phase aggregates and filters the recommendations to produce the predicted items for each user.

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A QUICK TUTORIAL ON MAHOUT’S RECOMMENDATION ENGINE (V 0.4) Jee Vang, Ph.D. [email_address] A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License. Slide Version 3.1
What is recommendation? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
What is Mahout? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
How does Mahout’s Recommendation Engine Work? X = S U R ,[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
What is the similarity matrix, S? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],S Item 1 Item 1 Item 2 Item 3 Item 4 Item 5 Item 6 Item 7 Item 2 Item 3 Item 4 Item 5 Item 6 Item 7 A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
What is the user’s preferences, U? ,[object Object],[object Object],[object Object],[object Object],U Item 1 Item 2 Item 3 Item 4 Item 5 Item 6 Item 7 A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
What is the recommendation, R? ,[object Object],[object Object],[object Object],[object Object],[object Object],R Item 1 Item 2 Item 3 Item 4 Item 5 Item 6 Item 7 A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
What data format does Mahout’s recommendation engine expects? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Format 1 123,345 123,456 123,789 … 789,458 Format 2 123,345,1.0 123,456,2.2 123,789,3.4 … 789,458,1.2 A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
How do you run Mahout’s recommendation engine? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
What are the mechanics of Mahout’s recommendation engine? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
Mahout’s Recommender Engine: Phase 1, Generate List of ItemIDs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
Mahout’s Recommender Engine: Phase 2, Create Preference Vector ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
Mahout’s Recommender Engine: Phase 3, Count Unique Users ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
Mahout’s Recommender Engine: Phase 4, Transpose Preferences Vectors ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
Mahout’s Recommender Engine: Phase 5.1, RowSimilarityJob, Compute Weights ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
Mahout’s Recommender Engine: Phase 5.2, RowSimilarityJob, Compute Similarities ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
Mahout’s Recommender Engine: Phase 5.3, RowSimilarityJob, Similarity Matrix ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
Mahout’s Recommender Engine: Phase 6, Pre-partial multiply, Similarity Matrix ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
Mahout’s Recommender Engine: Phase 7, Pre-partial multiply, Preferences ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
Mahout’s Recommender Engine: Phase 8, Partial Multiply ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
Mahout’s Recommender Engine: Phase 9, Filters Items ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
Mahout’s Recommender Engine: Phase 10, Aggregate and Recommend ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
Summary and Conclusion ,[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.
References ,[object Object],[object Object],[object Object],[object Object],A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License.

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A Quick Tutorial on Mahout’s Recommendation Engine (v 0.4)

  • 1. A QUICK TUTORIAL ON MAHOUT’S RECOMMENDATION ENGINE (V 0.4) Jee Vang, Ph.D. [email_address] A Quick Tutorial on Mahout's Recommendation Engine is licensed under a Creative Commons Attribution 3.0 Unported License. Slide Version 3.1
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