Improving social bookmark search using personalised latent variable language models

Morgan Harvey, Ian Ruthven, Mark J. Carman

Research output: Contribution to conferencePaperpeer-review

13 Citations (Scopus)
10 Downloads (Pure)


Social tagging systems have recently become very popular as a method of categorising information online and have been used to annotate a wide range of different resources. In such systems users are free to choose whatever keywords or 'tags' they wish to annotate each resource, resulting in a highly personalised, unrestricted vocabulary. While this freedom of choice has several notable advantages, it does come at the cost of making searching of these systems more difficult as the vocabulary problem introduced is more pronounced than in a normal information retrieval setting. In this paper we propose to use hidden topic models as a principled way of reducing the dimensionality of this data to provide more accurate resource rankings with higher recall. We first describe Latent Dirichlet Allocation (LDA), a sim- ple topic model and then introduce 2 extended models which can be used to personalise the results by including informa- tion about the user who made each annotation. We test these 3 models and compare them with 3 non-topic model baselines on a large data sample obtained from the Delicious social bookmarking site. Our evaluations show that our methods significantly outperform all of the baselines with the personalised models also improving significantly upon unpersonalised LDA.
Original languageEnglish
Number of pages10
Publication statusPublished - 12 Feb 2011
Event4th ACM International Conference on Web Search and Data Mining - Hong Kong, China
Duration: 9 Feb 201112 Feb 2011


Conference4th ACM International Conference on Web Search and Data Mining
Abbreviated titleWSDM 2011
CityHong Kong


  • collaborative tagging
  • personalised search
  • social bookmarks
  • topic models
  • information search and retrieval
  • computational linguistics


Dive into the research topics of 'Improving social bookmark search using personalised latent variable language models'. Together they form a unique fingerprint.

Cite this