Co-organizing DIR 2019!

📅 February 8, 2019 • 🕐 14:18 • 🏷 Blog • 👁 44

Together with Anne Schuth and Daan Odijk I’ll be co-organizing The Dutch-Belgian Information Retrieval workshop (DIR 2019). At DIR 2018, we sat down during lunch and came up with the following plan:

We also decided on a date: November 29, 2019!

For now, the most import work is done (designing a logo, and setting up our Twitter account ;-)). Stay tuned for more, later! And follow @dir_2019 for now ⚡.

ECIR 2014 Press Release

📅 April 3, 2014 • 🕐 14:50 • 🏷 Blog • 👁 12

Together with the persvoorlichting of the UvA we wrote a press release announcing our upcoming conference, check it out below.

English (translated through UvA) follows Dutch (original).

Nieuwe inzichten en ontwikkelingen in zoekmachinetechnologie (link)

European Conference on Information Retrieval

Wat kan een zoekmachine – op basis van wat je zoekt en waar je op klikt – afleiden over je identiteit en gedrag? Hoe kan ‘gamification’ ingezet worden om zoekmachines te verbeteren? En welke rol speelt het verzamelen en toegankelijk maken van verschillende datastromen in de stad van de toekomst? Deze en andere vragen worden beantwoord tijdens de 36e ‘European Conference on Information Retrieval’ (ECIR ‘14).

De conferentie, die dit jaar plaatsvindt van 13 tot en met 16 april in Amsterdam, brengt de internationale top van onderzoekers op het terrein van information retrieval (zoekmachinetechnologie) samen. Aan bod komen onderwerpen als personalisatie van zoekresultaten,recommender systems (aanbevelingssystemen), datamining in sociale media, en eCommerce en product search. Eugene Agichtein (Emory University, VS) opent ECIR ’14 met een keynote waarin hij ingaat op het afleiden van intenties en gedrag van internetgebruikers uit hun interacties met zoekmachines.

Technologische innovaties

Toegang tot (big) data en kostbare infrastructuren worden steeds belangrijker in de information retrieval. In een paneldiscussie belichten prominenten uit zowel het bedrijfsleven als de wetenschap de huidige stand van zaken en toekomstige ontwikkelingen in het onderzoeksveld. De industry day op woensdag 16 april wordt geopend met een keynote door Gilad Mishne (hoofd van het zoekteam van Twitter) over real-time zoeken op Twitter. Vervolgens presenteren (inter)nationale bedrijven, waaronder Yahoo! en eBay, hun laatste technologische innovaties.

Nederland is één van de meest vooraanstaande landen als het gaat om wetenschappelijk onderzoek in de information retrieval. De organisatie van ECIR ‘14 ligt in handen van het Intelligent Systems Lab Amsterdam (ISLA) van de Universiteit van Amsterdam, met ondersteuning van onder meer zoekgiganten als Microsoft, Yahoo!, Yandex en Google.


Hotel Casa 400
Eerste Ringdijkstraat 4
1097 BC Amsterdam

New insights and developments in search engine technology (link)

European Conference on Information Retrieval

What can a search engine deduce about your identity and habits based on the topics you search and select? How can gamification be used to improve search engines? And what role will the collection and provision of access to diverse data flows play in the city of the future? These are just a few of the questions to be addressed during the 36th European Conference on Information Retrieval (ECIR 14).

Set to take place on 13-16 April, the conference will bring international frontrunners in the field of information retrieval (search engine technology) together in Amsterdam. Topics to be covered include: the personalisation of search results, recommender systems, product search and data mining in social media and eCommerce. Opening the ECIR 14 will be Eugene Agichtein (Emory University, USA) with a keynote address explaining how the intentions and habits of Internet users can be deduced from their search engine interactions.

Technological innovations

Access to big data and high-cost infrastructures is becoming an increasingly important factor in information retrieval. In a panel discussion, leading names in business and science will shed light on the current state of play and what research in this field has in store. The special industry day on Wednesday, 16 April will open with a keynote address by Gilad Mishne (head of the Twitter search team) on real-time search on Twitter. This will be followed by presentations by various Dutch and international companies, including Yahoo! and eBay, about their own latest technologies.

The Netherlands is one of the pioneers in worldwide scientific research into information retrieval. The ECIR 14 is being organised by the University of Amsterdam’s Intelligent Systems Lab Amsterdam (ISLA) with support from search engine giants such as Microsoft, Yahoo!, Yandex and Google.

Time and location

Time: 09:00 Sunday, 13 April – 17:00 Wednesday, 16 April
Location: Hotel Casa 400, Eerste Ringdijkstraat 4, Amsterdam

Information Retrieval at LegalTech 2014

📅 February 6, 2014 • 🕐 04:04 • 🏷 Blog and Research • 👁 184

Thanks to the kind lady at the registration desk I had the unexpected honor of representing the beautiful former Carribean country of the Netherlands Antilles at LegalTech 2014, the self-proclaimed largest and most important legal technology event of the year.

David Graus at LegalTech

LegalTech is an “industry conference” where attorneys, lawyers, and IT people meet up and discuss the current and future state of law and IT. Product vendors show their software and tools aimed at making the life of the modern-day attorney easier. As I work on semantic search in eDiscovery, my reasons to attend (being generously invited by Jason Baron) were;

  1. To get a better overview and understanding of eDiscovery (in the US).
  2. To see what people consider the ‘future’ or important topics within eDiscovery.
  3. To understand what the current state of the art is in tools and applications.
  4. (To plug semantic search)

Indeed, in summary, to retrieve information! (As an IR researcher does). The conference included keynotes, conference tracks, panel discussions and a huge exhibitor show where over 100 vendors of eDiscovery-related software present their products. All this fits on just three floors of the beautiful Hilton Midtown Hotel in the middle of New York.

To get a feel of the topics and themes, tracks titles included a.o. eDiscovery, Transforming eDiscovery, Big Data, Information Governance, Advanced IT, Technology in Practice, Technology and Trends Transforming the Legal World, Corporate Legal IT.


LegalTech is a playground for attorneys and lawyers, not so much PhD students who work on information extraction and semantic search. Needless to say I was far from the typical attendant (possibly the most atypical). But LegalTech proved to be an informative and valuable crash course in eDiscovery for me (I think I can tick the boxes of all 4 of the aforementioned reasons for attending).


The keynotes allowed me to get a better understanding of eDiscovery (a.o., through hearing some of the founders of the eDiscovery world), the panel discussions were very useful in getting an understanding of the open problems, challenges and future directions, and finally the trade show allowed me to get a very complete overview of what is being built and used right now in terms of eDiscovery-supporting software.

I had varying success of talking to vendors about the stuff I was interested in: technology and algorithms behind tools, and choices for including or excluding certain features and functionalities. More frequently than not would an innocently nerdy question from my part be turned around into a software salespitch. To be fair, these people were here to sell, or at least show, so this is hardly unexpected.

The tracks: my observations

During the different tracks and panel discussions I attended, I noticed a couple of things. This is by no means a complete overview of the current things that matter in eDiscovery, but just a personal report of the things I found interesting or noteworthy;

Some of the “open door” recurring themes revolved around the “man vs machine”-debate, trust in algorithms, balance in computer assisted review vs manual review, the intricacies of algorithm performance measurement, and where Moore’s law will bring the law world in 5-10 years. Highly relevant issues for attorneys, lawyers and eDiscovery vendors, but things that I take for granted, and consider the starting point (default win for algorithms!). However, it seems like this is a debate that is not yet settled in this domain, it also seems that while everyone accepts computer assisted review as the unavoidable future, it seems still unclear what this unavoidable future exactly will look like.

On multiple occasions I heard video and image retrieval being mentioned as important future directions for eDiscovery (good news for some colleagues at the University of Amsterdam down the hall). Also, the challenge of privacy and data ownership in a mobile world, where enterprise and personal data are mixed and spread out across iPads, smartphones, laptops and clouds, were identified as major future hurdles.

Finally, in the session titled “Have we Reached a “John Henry” Moment in Evidentiary Search?” the panelists (which included Jason Baron and Ralph Losey) touched upon using eDiscovery tools and algorithms for information governance. Currently, methods are being developed to detect, reconstruct, classify or find events of interest: after the fact. Couldn’t these be used in a predictive setting, instead of a retro-spective one; learning to predict bad stuff before it happens. Interesting stuff.

The tradeshow: metadata-heavy


What I noticed particularly at the trade show was that there was a large overlap both in tools’ functionality and features and their looks and designs. But what I found more striking is the heavy focus on metadata. The tools typically use metadata such as timestamps, authors, and document types to allow users to drill down through a dataset, filtering for time periods, keywords, authors, or a combination of all of these.

Visualizations a plenty, with the most frequent ones being Google Ngrams-ish keyword histograms, and networks (graphs) of interactions between people. What was shocking for an IR/IE person like myself is that typically, once a user is done drilling down to a subset of document, he is designated to prehistoric keyword search to explore and understand the content of the set of documents. Oh no!

But for someone who’s spending 4 years of his life to enabling semantic search in this domain this isn’t worrying, but rather promising! After talking to vendors I learned that plenty of them are interested in these kind of features and functionalities, so there is definitely room for innovation here. (However to be fair, whether the target users agree might be another question).


Anyway, this ‘metadata heaviness’ is obviously a gross oversimplification and generalization, and there were definitely some interesting companies that stood out for me. Here’s a small, incomplete, and biased summary;

  • I had some nice talks with the folks at CatalystSecure, who’s senior applied research scientist and former IR academic (dr. Jeremy Pickens) was the ideal companion to be unashamedly nerdy with, talking about classification performance metrics, challenges in evaluating the “whole package” of the eDiscovery process, and awesome datasets.
  • RedOwl Analytics do some very impressive stuff with behavioural analytics, where they collect statistics for each ‘author’ in their data (such as number of emails sent and received, ‘time to respond’, number of times cc’ed), to get an ‘average baseline’ of a single dataset (enterprise), that they can use to recognize individuals who deviate from this average. The impressive part was that they were then able to map these deviations to behavioural traits (such as ‘probability of an employee leaving a company’, or on the other side of the spectrum identifying the ‘top employees’ that otherwise remain under the radar). How that works under the hood remains a mystery for me, but the type of questions they were able to answer in the demo were impressive.
  • Recommind‘s CORE platform seems to rely heavily on topic modeling, and was able to infer topics from datasets. In doing so, Recommind shows we can indeed move beyond keyword search in a real product (and outside of academic papers ;-) ). This doesn’t come as a surprise, seeing that Recommind’s CTO dr. Jan Puzicha is of probabilistic latent semantic indexing (/analysis) fame.

What’s next?

As I hinted at before, I’m missing some more content-heavy functionalities, e.g., (temporal) entity and relation extraction, identity normalization, maybe (multi document) summarization? Conveniently, this is exactly what me and my group are working on! I suppose the eDiscovery world just doesn’t know what they’re missing, yet ;-).

Not dead (yet)

📅 February 10, 2012 • 🕐 16:39 • 🏷 Thesis (MSc) • 👁 32

While I haven’t been as active and hard working on my graduation project as I would have liked to be, I am not dead (nor the project). Earlier this week I presented my project to the Bio-imaging group of Leiden University, which helped me a lot. I was able to present my project pretty much as-is, since I’m mostly done with the technical parts. I received valuable feedback and got good insights into what I should explain more thoroughly in the presentation. (more…)