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A simple survey of Diversity and novelty metrics for recommender systems
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Diversity and novelty for recommendation system
1.
A simple survey
of Diversity and novelty metrics for recommender systems Reporter: 孙建凯 2012.07.11
2.
Move beyond accuracy
metrics while the majority of algorithms proposed in recommender systems literature have focused on improving recommendation accuracy other important aspects of recommendation quality, such as the diversity of recommendations, have often been overlooked. The recommendations that are most accurate according to the standard metrics are sometimes not the recommendations that are most useful to users[1] 2 Copyright © 2012 by IRLAB@SDU
3.
Diversity and Novelty
Accurate is not always good: How Accuracy Metrics have hurt Recommender Systems GroupLensResearch,CHI'06 Copyright © 2012 by IRLAB@SDU
4.
Accuracy does not
tell the whole story Copyright © 2012 by IRLAB@SDU
5.
Diversity Individual Diversity
Aggregate Diversity Copyright © 2012 by IRLAB@SDU
6.
Individual Diversity Diversity
Difficulty[3] Average dissimilarity between all pairs of items recommended to a given user(intra-list similarity) [2,4] Copyright © 2012 by IRLAB@SDU
7.
Diversity Difficulty What
We Talk About When We Talk About Diversity [DDR’12 Northeastern University USA] Like query difficulty in IR For a specific query and corpus, query difficulty is a measure of how successful the average search engine should be at ad-hoc retrieval. Copyright © 2012 by IRLAB@SDU
8.
Diversity Difficulty Diversity
Difficulty is defined with respect to a query and a corpus. Describes diversity-the number of subtopics which are covered by a list; Describes novelty-which is inversely proportional to the number of times a list repeats a subtopic Copyright © 2012 by IRLAB@SDU
9.
Finding needles in
the haystack Imagine a query with 10 subtopics ,1000 documents relevant to only the first subtopic, and each of the remaining subtopics covered by a single, unique document. On the other hand ,if there are large numbers of documents relevant to multiple subtopics, it would be easy to produce a diversity list. Copyright © 2012 by IRLAB@SDU
10.
Diversity Difficulty function
The maximum amount of diversity achievable by any ranked list-dmax The ease with a system can produce a diverse ranked list.-dmean Harmonic function Copyright © 2012 by IRLAB@SDU
11.
Examples
Copyright © 2012 by IRLAB@SDU
12.
Improving Recommendation Lists
Through Topic Diversification Introduce the intra-list similarity metric to access the topic diversification of recommendation lists and the topic diversification approach for decreasing the intra-list similarity Average dissimilarity between all pairs of items recommended to a given user Copyright © 2012 by IRLAB@SDU
13.
Intra-list Similarity
Copyright © 2012 by IRLAB@SDU
14.
Taxonomy-based similarity Metrics
Instantiate c with their metric for taxonomy- driven filtering.[5] Copyright © 2012 by IRLAB@SDU
15.
Topic Diversification Algorithm Algorithm
A brief textual sketch Copyright © 2012 by IRLAB@SDU
16.
Experiments precision
diversity
17.
Aggregate Diversity improving
recommendation Diversity using ranking- based techniques[IEEE transaction’12] Use the total number of distinct items recommended across all users as an aggregate diversity measure, define as follows: Copyright © 2012 by IRLAB@SDU
18.
General overview of
ranking-based approaches for improving diversity Copyright © 2012 by IRLAB@SDU
19.
Re-Ranking Approach
Copyright © 2012 by IRLAB@SDU
20.
Other Re-ranking Approach
Copyright © 2012 by IRLAB@SDU
21.
Other Re-ranking Approach
Copyright © 2012 by IRLAB@SDU
22.
Other Re-ranking Approach
Copyright © 2012 by IRLAB@SDU
23.
Other Re-ranking Approach
Copyright © 2012 by IRLAB@SDU
24.
Other Re-ranking Approach
Copyright © 2012 by IRLAB@SDU
25.
Other Re-ranking Approach
Copyright © 2012 by IRLAB@SDU
26.
Combining Ranking Approaches
Many possible ways to combine several ranking functions In this paper , linear combination Open issue: letor ? Neural network? Copyright © 2012 by IRLAB@SDU
27.
Entropy A study
of Heterogeneity in Recommendations for a social Music Service[6] Copyright © 2012 by IRLAB@SDU
28.
Open issue:probability
Copyright © 2012 by IRLAB@SDU
29.
Entropy Aggregate Entropy:
Individual Entropy: Item popularity subtopic popularity? between lists? Copyright © 2012 by IRLAB@SDU
30.
Bipartite network Bipartite
network projection and personal recommendation[Tao Zhou, Physical Review] Solving the apparent diversity-accuracy dilemma of recommender systems[Tao Zhou] Copyright © 2012 by IRLAB@SDU
31.
Illustration of resource-allocation process
in bipartite network Copyright © 2012 by IRLAB@SDU
32.
Solving the apparent
diversity-accuracy dilemma heats probs Copyright © 2012 by IRLAB@SDU
33.
Hybrid Methods weight
hybrid Copyright © 2012 by IRLAB@SDU
34.
Diversity Measure
Copyright © 2012 by IRLAB@SDU
35.
Surprisal/novelty
Copyright © 2012 by IRLAB@SDU
36.
Results-why better?
Copyright © 2012 by IRLAB@SDU
37.
Surprise me Tangent:
A novel, ‘surprise me’, recommendation algorithm [kdd’09] Copyright © 2012 by IRLAB@SDU
38.
Framework of Tangent
Algorithm Suggest items which are not only relevant to user preference but also have a large connectivity to other groups. Consisting three parts as follows: 1 Calculate relevance score(RS) for each node 2 Calculate bridging score(BRS) for each node 3 Compute the Tangent score by somehow merging two criteria above Copyright © 2012 by IRLAB@SDU
39.
Case study
Copyright © 2012 by IRLAB@SDU
40.
Case study
Copyright © 2012 by IRLAB@SDU
41.
Call for papers
September 20, 2012 Copyright © 2012 by IRLAB@SDU
42.
Reference 1. Accurate
is not always good: How Accuracy Metrics have hurt Recommender Systems 2.improving recommendation Diversity using ranking-based techniques 3. What We Talk About When We Talk About Diversity 4. Improving Recommendation Lists Through Topic Diversification 5. Taxonomy-driven computation of product recommendations Copyright © 2012 by IRLAB@SDU
43.
Reference 6. A
study of Heterogeneity in Recommendations for a social Music Service 7. Bipartite network projection and personal recommendation 8.Solving the apparent diversity-accuracy dilemma of recommender systems 9. Tangent: A novel, ‘surprise me’, recommendation algorithm Copyright © 2012 by IRLAB@SDU
44.
thanks
Copyright © 2012 by IRLAB@SDU
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