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Thanks to everyone who made it to the Communication Complexity and Applications II workshop in Banff last month. See here for videos and here for open problems. Thanks to Sagar for compiling the open problems.



Ely asked me to remind everyone that the deadline for the 26th Annual Symposium on Combinatorial Pattern Matching is fast approaching. You have until 2nd February to match your combinatorial pattern.

Two of my students, Michael Crouch and Daniel Stubbs, are graduating this year. What does this mean?

Email me if you’d like to follow-up on any of the above points.

New Blog: Eric Blais, Sourav Chakraborty, and C. Seshadhri have started a new blog on property testing at Also check out Moritz Hardt’s newish blog at

This Blog: Things have been quieter at the polylogblog over the last few months but this will soon be rectified. This semester, I’m visiting the Simons Institute for the Theory of Computing in Berkeley. The program on Theoretical Foundations of Big Data Analysis has been great so far and the second workshop starts tomorrow: tune in live here for everything you’ve always wanted to know about “Succinct Data Representations and Applications”. However, with so much happening, I’ve been rather derelict in my blogging duties. Fortunately, numerous other bloggers have picked up the slack:

The exciting news sweeping the blogosphere (see here and here) is that SPARC 2013 is on its way. Specifically, Atri asked me to post the following:

Efficient and effective transmission, storage, and retrieval of information on a large-scale are among the core technical problems in the modern digital revolution. The massive volume of data necessitates the quest for mathematical and algorithmic methods for efficiently describing, summarizing, synthesizing, and, increasingly more critical, deciding when and how to discard data before storing or transmitting it. Such methods have been developed in two areas: coding theory, and sparse approximation (SA) (and its variants called compressive sensing (CS) and streaming algorithms).

Coding theory and computational complexity are both well established fields that enjoy fruitful interactions with one another. On the other hand, while significant progress on the SA/CS problem has been made, much of that progress is concentrated on the feasibility of the problems, including a number of algorithmic innovations that leverage coding theory techniques, but a systematic computational complexity treatment of these problems is sorely lacking. The workshop organizers aim to develop a general computational theory of SA and CS (as well as related areas such as group testing) and its relationship to coding theory. This goal can be achieved only by bringing together researchers from a variety of areas.

The Coding, Complexity and Sparsity workshop (SPARC 13) will be held in Ann Arbor, MI on Aug 5-7.

These will be hour-long lectures designed to give students an introduction to coding theory, complexity theory/pseudo-randomness, and compressive sensing/streaming algorithms. We will have a poster session during the workshop and everyone is welcome to bring a poster but graduate students and postdocs are especially encouraged to give a poster presentation.

This is the third incarnation of the workshop and the previous two workshops were also held in Ann Arbor in August of 2011 and 2012.

Confirmed speakers:

  • Jin Yi Cai (University of Wisconsin, Madison)
  • Shafi Goldwasser (MIT)
  • Piotr Indyk (MIT)
  • Swastik Kopparty (Rutgers University)
  • Dick Lipton (Georgia Tech)
  • Andrew McGregor (University of Massachusetts, Amherst)
  • Raghu Meka (IAS)
  • Jelani Nelson (Harvard)
  • Eric Price (MIT)
  • Christopher Ré (University of Wisconsin, Madison)
  • Shubhangi Saraf (Rutgers University)
  • Suresh Venkatasubramanian (University of Utah)
  • David Woodruff (IBM)
  • Mary Wootters (Michigan)
  • Shuheng Zhou (Michigan)

We have some funding for graduate students and postdocs with preference given to those who will be presenting posters. For registration and other details, please look at the workshop webpage.


Ely Porat asked me remind everyone that the deadline for the 20th String Processing and Information Retrieval Symposium (SPIRE) is 2nd May, about a month from now. More details at

Update: The deadline has been extended to 9th May.

A guest post from Krzysztof Onak:

A few recent workshops on sublinear algorithms compiled lists of open problems suggested by participants. During the last of them, in July in Dortmund, we realized that it would be great to have a single repository with all those problems. After followup discussions (with Alex Andoni, Piotr Indyk, and Andrew McGregor), we created a wiki page at Currently, it only contains open problems from the aforementioned workshops, but we invite submissions of inspiring problems from all areas of sublinear algorithms (sublinear time, sublinear space, etc.). Additionally, we want to compile a list of books, surveys, lecture notes, and slides that can be useful for learning about different areas of sublinear algorithms. We hope that this wiki will not serve only spambots, which have already been raiding it for a while, but it will also be a great source of inspiration for the whole community.

After a very successful hiring season last year, the department is now focusing on hiring in theory, NLP, robotics, and vision (that’s four separate searches rather than one extreme interdisciplinary position).  So please apply! The official ad is here and note that, unlike previous years, we’re able to hire in theory at either the assistant or associate level. We’ll start reviewing applications December 3.

As promised, here are the slides from the STOC Workshop on Algorithms for Distributed and Streaming Data. The workshop was standing-room only so here’s your chance to review the slides while sitting down. More generally, all the workshops seemed to be a great success and I’m happy to see that the experiment will be repeated at FOCS. Deadline for proposals is 20 June.

Thanks again to the speakers and everyone who came along.

  © Copyright Keith Edkins and licensed for reuse under this Creative Commons Licence

While on the topic of STOC, I also wanted to mention a STOC workshop on “Algorithms for Distributed and Streaming Data” that will hopefully be of interest. It will take place Saturday afternoon, 19th May in NYU. The schedule can be found here.

So here’s the pitch: At this point it’s readily apparent that big data has become big news (e.g., see here and here). But what does this mean for the STOC/FOCS/SODA community? What are the algorithmic problems we could be solving? What are the appropriate computational models? Are there opportunities for industrial impact? What should we be teaching our undergraduate and graduate students? To address the relevant topics, we’ve lined-up a great set of speakers including Sergei Vassilvitskii, John Langford, Piotr Indyk, and Ashish Goel. Hope to see you there.


A research blog about data streams and related topics.

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