People Watching with Machine Learning

Data Science
Location: Room 1-6 Level: Intermediate
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Observing how other human beings interact is so interesting that we have a name for when we do it recreationally, we call it “people-watching.” Evolution has equipped us both with a desire to people-watch and with the tools we need to do it. In social situations, we can spot patterns such as groups forming and dispersing fairly easily, but it’s harder to describe that observation process logically. If we could do that, we could make machines people-watch for us.

Modern smart phone platforms come with a growing range of sensors. They also have a (near-) ubiquitous data connection, and the ability to report user positioning via multiple methods. They are almost
invariably carried everywhere on their owner’s person. Given all that, it’s now fairly easy to build large, distributed datasets from people’s smart phones — data that when collated together has a vast amount of information regarding the social graph.

We’ve developed algorithms incorporating machine learning techniques that, combined with these large spatio-temporal datasets, enable us to automatically characterize groups of people from the spatially coherent behaviour of the individuals that form them, as well as to look for other forms of interactions between people and distinguish between these different types of interactions.

These algorithms are going to give machines access to our social interactions in ways that weren’t possible before. While humans find it harder to spot social groups in large crowds because of the amount of data involved, additional data makes group identification algorithmically easier. Given enough data, machines might become better at finding patterns by people-watching than we are ourselves, and as a result give us novel insights into our own social interactions.

Photo of Alasdair Allan

Alasdair Allan

Babilim Light Industries

Alasdair Allan is a scientist, author, hacker, tinkerer, and journalist who has recently been spending a lot of time thinking about the Internet of Things, which he thinks is broken. He is the author of a number of books and sometimes also stands in front of cameras. You can often find him at conferences talking about interesting things or deploying sensors to measure them. A couple of years ago, he rolled out a mesh network of five hundred sensor motes covering the entirety of Moscone West during Google I/O. He’s still recovering. A few years before that, he caused a privacy scandal by uncovering that your iPhone was recording your location all the time, which caused several class-action lawsuits and a US Senate hearing. Some years on, he still isn’t sure what to think about that.

Alasdair sporadically writes blog posts about things that interest him or, more frequently, provides commentary in 140 characters or less. He is a contributing editor for Make magazine and a contributor to O’Reilly Radar. Alasdair is a former academic. As part of his work, he built a distributed peer-to-peer network of telescopes that, acting autonomously, reactively scheduled observations of time-critical events. Notable successes included contributing to the detection of what was—at the time—the most distant object yet discovered, a gamma-ray burster at a redshift of 8.2.

Zena Wood

University of Exeter

Zena Wood is employed as a lecturer in Computer Science at the University of Exeter, she works in the field of Applied Ontology and spatiotemporal reasoning. Entitled “Detecting and Identifying Collective Phenomena within Movement Data,” her PhD focused on identifying what is meant by the term collective, the different types of collective that exist and developing a method that allowed the identification of such phenomena within large spatiotemporal datasets.

Zena has continued to work within these fields and is currently developing similar techniques that can be used to study human and animal behaviour. In addition to her roles as lecturer, Zena also coordinates the eskills’s endorsed undergraduate and postgraduate IT Management for Business degrees and Computer Science outreach at Exeter.


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