|Department of Engineering|
|University of Cambridge > Engineering Department > News & Features|
26 July 2010
The Department's Professor Zoubin Ghahramani and Katherine Heller, along with Dinesh Vadhia, CEO and founder of the spin-off search company Xyggy, wrote the article below about their work on new ways of searching the internet, as a guest post on the thenoisychannel.com website. “Our paradigm for search is based on the fundamental idea that search should be item-based not just text-based, and that a query based on items provides substantial advantages and additional information as compared to queries involving only keywords.”
People are very good at learning new concepts after observing just a few examples. For instance, a child will confidently point out which animals are “dogs” after having seen only a couple of examples of dogs before in their lives. This ability to learn concepts from examples and to generalize to new items is one of the cornerstones of intelligence. By contrast, search services currently on the internet exhibit little or no learning and generalization.
Bayesian Sets is a new framework for information retrieval based on how humans learn new concepts and generalize. In this framework a query consists of a set of items which are examples of some concept. Bayesian Sets automatically infers which other items belong to that concept and retrieves them. As an example, for the query with the two animated movies, “Lilo & Stitch” and “Up”, Bayesian Sets would return other similar animated movies, like “Toy Story“.
How does this work? Human generalization has been intensely studied in cognitive science and various models have been proposed based on some measure of similarity and feature relevance. Recently, Bayesian methods have emerged as models of both human cognition and as the basis of machine learning systems.
Consider a universe of items, where the items could be web pages, documents, images, ads, social and professional profiles, publications, audio, articles, video, investments, patents, resumes, medical records, or any other class of items we may want to query.
An individual item is represented by a vector of features of that item. For example, for text documents, the features could be counts of word occurrences, while for images the features could be the amounts of different color and texture elements.
Given a query consisting of a small set of items (e.g. a few images of buildings) the task is to retrieve other items (e.g. other images) that belong to the concept exemplified by the query. To achieve the task, we need a measure, or score, of how well an available item fits in with the query items.
A concept can be characterized by using a statistical model, which defines the generative process for the features of items belonging to the concept. Parameters control specific statistical properties of the features of items. For example, a Gaussian distribution has parameters which control the mean and variance of each feature. Generally these parameters are not known, but a prior distribution can represent our beliefs about plausible parameter values.
The score used for ranking the relevance of each item x given the set of query items Q compares the probabilities of two hypotheses. The first hypothesis is that the item x came from the same concept as the query items Q. For this hypothesis, compute the probability that the feature vectors representing all the items in Q and the item x were generated from the same model with the same, though unknown, model parameters. The alternative hypothesis is that the item x does not belong to the same concept as the query examples Q. Under this alternative hypothesis, compute the probability that the features in item x were generated from different model parameters than those that generated the query examples Q. The ratio of the probabilities of these two hypotheses is the Bayesian score at the heart of Bayesian Sets, and can be computed efficiently for any item x to see how well it “fits into” the set Q.
An important aspect of Bayesian Sets is that it automatically learns which features are relevant from queries consisting of two or more items. For example, a movie query consisting of “The Terminator” and “Titanic” suggests that the concept of interest is movies directed by James Cameron, and therefore Bayesian Sets is likely to return other movies by Cameron. The power of queries consisting of multiple example items is unexploited in most search engines. Searching using examples is natural and intuitive for many situations in which the standard text search box is too limited to express the user’s information need, or infeasible for the type of data being queried.
The Bayesian Sets method has been applied to diverse problem domains including: unlabelled image search using low-level features such as color, texture and visual bag-of-words; movie suggestions using the MovieLens and Netflix ratings data; music suggestions using last.fm play count and user tag data; finding researchers working on similar topics using a conference paper database; searching the UniProt protein database with features that include annotations, sequence and structure information; searching scientific literature for similar papers; and finding similar legal cases, New York Times articles and patents.
Apart from web and document search, Bayesian Sets can also be used for ad retrieval through content matching, building suggestion systems (“if you liked this you will also like these” which is about understanding the user’s mindset instead of the traditional “people who liked your choice also liked these”) and finding similar people based on profiles (e.g. for social networks, online dating, recruitment and security). All these applications illustrate the countless range of problems for which the patent-pending Bayesian Sets provides a powerful new approach to finding relevant information.
An important aspect of the approach is that the search box accepts text queries as well as items, by dragging them in and out of the search box. An implementation using patent data is at http://www.xyggy.com/patent.php. Enter keywords (e.g., “earthquake sensor”) and relevant items to the keywords are displayed. Drag an item of interest from the results into the search box and the relevance changes. When two or more items are added into the search box, the system discovers what they have in common and returns better results. Items can be toggled in/out of the search by clicking the +/- symbol and items can be completely removed by dragging them out of the search box. Each change to an item in the search box automatically retrieves new relevant results. A future version will allow for explicit relevance feedback.
Alex Ksikes, a PhD student working with Professor Ghahramani, has also developed a new interface for searching a database of over a million movies that combines Bayesian Sets with Cloud Mining http://imdb.cloudmining.net. This interface provides users with a very rich environment for search allowing them to combine traditional text search with Bayesian Sets similarity search and search by clicking on a rich set of tag clouds.
Bayesian Sets demonstrates that intelligent information retrieval is possible, using a Bayesian statistical model of human learning and generalization. This approach, based on sets of items encapsulates several novel principles. First, retrieving items based on a query can be seen as a cognitive learning problem; where we have used our understanding of human generalization to design the probabilistic framework. Second, retrieving items from large corpora requires fast algorithms and the exact computations for the Bayesian scoring function are extremely fast. Finally, the example-based paradigm for finding coherent sets of items is a powerful new alternative and complement to traditional query-based search.
Finding relevant information from vast repositories of data has become ubiquitous in modern life. Professor Ghahramani's research team believes that this approach, based on cognitive principles and sound Bayesian statistics, will find many uses in business, science and society.
For further information please contact Zoubin Ghahramani (zoubin - at - eng.cam.ac.uk) or Dinesh Vadhia (dinesh - at - xyggy.com)
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