A Recommendation Engine Exploiting Collective Intelligence on Big Data
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1 A Recommendation Engine Exploiting Collective Intelligence on Big Data Luigi Giuri, Executive Chairman Alessandro Negro, CTO 1
2 Outline ü Introduction to recommendations ü Recommenders concepts ü Recommenders in action ü Reco4 Recommendation Engine 2
3 The questions ü Which digital camera should I buy? ü Which movie should I rent? ü Which web sites will I find interesting? ü What is the best holiday for me and my family? ü Which book should I buy for my next vacation? 3
4 How to decide? ü Conversations with friends ü Obtaining information from a trusted third party ü Consulting the Internet ü Making a gut decision ü Simply following the crowd 4
5 A software solution The software system that determines which items should be shown to a particular user is a recommender system. 5
6 Outline ü Introduction to recommendations ü Recommenders concepts ü Recommenders in action ü Reco4 Recommendation Engine 6
7 Type of recommenders ü Collaborative Filtering ü Content-based ü Knowledge-based ü Hybrid 7
8 Collaborative filtering If users shared the same interests in the past, they will also have similar tastes in the future 8
9 CF analysis ü How do we find users with similar tastes? ü How do we measure similarity? ü Are there other techniques besides looking for similarity? 9
10 CF approaches ü Memory-based: k-nearest neighborhood User-based Item-based ü Model-based ü Latent factor models Matrix factorization ü Association rule mining 10
11 User-Item Dataset Iron Man Notting Hill Star Wars Life is Beautiful Louis Mary Ben Hur Wall-E Cars Tron Matt Andy Alex
12 Ok, but ü We want to trasform the sparse matrix into a complete matrix ü We do this with predictions of the values for empty cells ü I.e., the algorithms perform rating predictions 12
13 And then... After predicting the user rating for all interesting items we recommend the top n rated items 13
14 CF pros and cons Pros No need of item knowledge Very simple data structure Scalable A lot of algorithms are available Cons Cold start problem Over-specialization Difficult explanation Require large user groups 14
15 Content-based Recommenders Leveraging structured and unstructured data sources to extract item descriptions and a user profile that assigns importance to these characteristics. 15
16 CB analysis ü How can systems automatically acquire and improve user profiles? ü What techniques can be used to extract the item descriptions? ü How do we determine which items match a user s interests? 16
17 Data source Title Genre Author Type Keywords Text The Night of the Gun The Lace Reader Into the Fire Memoir David Carr Paperback press and journalism, drug addicion, personal memoirs, New York FicIon, Mystery Romance, Suspense Brunonia Barry Suzanne Brockmann Hardcover Hardcover American contemporary ficion, detecive, historical American ficion, murder, neo- Nazism Nullam non rhoncus nisl, vitae tempor ligula. Nullam vitae faucibus ex. Suspendisse euismod, dui in auctor ornare. Morbi vesibulum ligula vitae augue egestas, in volutpat lorem efficitur. Proin porta erat non ex sagiys, vel sagiys nisl Duis sed laoreet purus. Donec iaculis aliquam justo, a commodo turpis efficitur sit amet. Morbi in nunc euismod, iaculis 17
18 CB approaches ü Similarity-based retrieval knn Relevance feedback ü Other text classification methods Probabilistic Linear classifiers and machine learning Explicit decision models 18
19 Item-Feature Dataset Genre Type Keywords The Night of the Gun The Lace Reader Memoir Romance Paperback Hardcover New York detective Into the Fire
20 CB pros and cons Pros Does not require large user groups New items can be immediately recommended Low cost for knowledge acquisition and maintenance Cons Subjective, qualitative item features acquisition User preference elicitation New users Tendency to overfit the training data 20
21 Knowledge-based recommenders Use structured quality features to derive meansend information about both the current user and the available items. 21
22 Data source id price ($) mpix opt-zoom LCD-size movies sound waterproof P x 2.5 No No Yes P x 2.7 Yes Yes No P x 2.5 Yes Yes No P x 2.7 Yes No Yes P x 3.0 Yes Yes No P x 3.0 Yes Yes No P x 3.0 Yes Yes No P x 3.0 yes Yes No 22
23 KB pros and cons Pros Applicable to low purchase rate scenario (cars, computers, houses) No ramp-up problem Conversational recommender Cons Domain specific Knowledge acquisition High user interaction required 23
24 Hybrid recommenders Combine different techniques to generate better or more precise recommendations 24
25 Outline ü Introduction to recommendations ü Recommenders concepts ü Recommenders in action ü Reco4 Recommendation Engine 25
26 Recommender systems ü A system that can recommend or present items to the user based on the user s interests and interactions ü One of the best ways to provide a personalized customer experience ü Built by exploiting collective intelligence or content based approach to perform predictions ü Examples: Amazon, YouTube, Netflix, Yahoo, Tripadvisor, Last.fm, IMDb 26
27 Why recommender systems ü Standard uses: Increase the number of items sold Sell more diverse items Increase the user satisfaction Increase user fidelity Better understand what the user wants ü Advanced uses: Create ad hoc campaigns (per geographic area, per type of users) Optimize products distribution over a wide area for large retail chains Optimize marketing campaign filtering target 27
28 Outline ü Introduction to recommendations ü Recommenders concepts ü Recommenders in action ü Reco4 Recommendation Engine 28
29 Problem ü There are no available software products for state-of-the-art recommender systems ü There is no "best solution ü There is no "one solution fits all ü The Netflix price winner composed 104 different algorithms ü A high-end recommender engine can be built only through expensive custom projects ü Large scale, multi-source datasets require a big data approach 29
30 Solution: Reco4 Recommender Engine A graph-based recommender engine 30
31 Reco4 main goals ü Implement the state-of-the-art in the recommendation on top of a graph model ü Provide a complete framework ü Offer an easy to use dashboard/console ü Provide software/cloud services/consultancy 31
32 Reco4 features ü Core Based on multiple approaches (collaborative filtering, content-based, ) Autonomous and self-learning recommender configuration Persistent and updatable models (multi model supported) Real-time and batch mode of operations ü Algorithms Commercial and research-oriented algorithms Context-aware recommendations Social recommendations ü Operations Cluster and cloud-ready for Big Data Analysis Tested on Oracle Big Data Appliance and Amazon WS Integrated into Oracle Marketing Cloud (Eloqua) 32
33 Advantage of graph database ü NoSQL database to handle BigData ü Extensibility ü No aggregate-oriented database ü Minimal information needed ü Natural way for representing connections: User - to item Item - to Item User - to User Item to Features ü Graph Based/Social Algorithms ü Graph Partitioning (sharding) ü Performance 33
34 Reco4 architecture stack 34
35 Product evolution along 3 directions Algos Model Based Memory Based Content Based Context Awareness Social Network Association Rules Composition Tools GraphDBs Apache Storm Apache Hadoop Distributed Cache Grizzly OpImizaIon/ RealTime SVD PCA Clustering Map/ Reduce Sampling 35
36 Algorithms roadmap Collaborative filtering: ü Memory based (Neighborhood) User/Item based Several distance algorithms (Cosine, Euclidean, Tanimoto, etc.) Graph based Path Based Similarity (Shortest Path, Number of Paths) Random Walk Similarity (Item Rank, Average first-passage/commute time) ü Model based ü Latent factor Stochastic gradient descendant Alternating least square SVD++ (by Koren) ü Association Rule Mining 36
37 Algorithms roadmap (cont d) Content Based: ü Latent Semantic Indexing ü Ontology Based Analysis Social recommendation: ü Trust based approach ü Probabilistic approach 37
38 Algorithms roadmap (cont d) Cross-cutting features (all algos) ü Binary (One class) ü Context awareness (pre- and post-filtering) ü Composability ü Real time ü Parallelization 38
39 Recommendation model 39
40 Reco4 Hadoop ü Based on Hadoop 2.x ü Leveraging yarn resource manager ü Tested on local installation and Amazon WS Elastic MR ü Tested on Oracle Big Data Appliance (VM) ü Export graph to HDFS and import result from HDFS to graph ü Algorithms: ü K-nearest neighbour ü Association rule mining ü K-means clustering 40
41 Reco4 in the cloud ü Recommendation as a service (RaaS) ü Reco4 cloud infrastructure will offer: Pay as you need Pay as you grow Support for burst Periodical analysis at lower costs Test/evaluate several algorithms on a reduced dataset Compose algorithms dynamically Hadoop support 41
42 Reco4 Console: Dashboard 42
43 Reco4 Console 43
44 Reco4 Console: Jobs 44
45 Reco4 Console: Graph Visualization 45
46 Current use cases Intelligent Performance Marketing Marketing campaign optimization Intelligent lead scoring Oracle Marketing Cloud (Eloqua) seamless integration Anti-Money Laundering User-Generated video content Gaming/Gambling industry 46
47 Reco4 and the Oracle stack TransacIonal Data PredicIon Data AnalyIcal Data Feedback OLTP Environments Reco4 Processing Environment Marketing Campaign Management 47
48 Thank you Luigi Giuri, Alessandro Negro, References: D. Jannach et al, Recommender Systems An Introduction, Cambridge UP F. Ricci et al, Recommender Systems Handbook, Springer 48
49 49
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