Archive for mirror workshop

Nature on mirror conferences

Posted in Books, Statistics, University life with tags , , , , , , , , , , , , , , , , , , , , , , , on January 28, 2026 by xi'an

In a news article entitled “Scientists skip key US meetings — and seize on smaller alternatives”, Nature discusses the impact of the restrictive policies put in place by the Trump administration on US conferences and their attendance. Including the multiplication of mirror and satellite meetings. One of the examples in the article is Neurips 2025,

“…the artificial-intelligence conference NeurIPS hosted not only its main meeting in San Diego, California, but also its first-ever alternative location, in Mexico City, with the goal of alleviating travel challenges (…) in response to “skyrocketing attendance and difficulties in obtaining travel visas some attendees have experienced in the past few years when only one location was available” [while] a group of AI researchers in Europe organized an independent spin-off conference, dubbed EurIPS, in Copenhagen (…) owing to concerns including climate change [and people expressing] a desire for a less hostile environment”

With a limited number of 500 participants attending in Mexico. And a massive number in Copenhagen, over 2,000! With a final quote from Emtiyaz Khan (a plenary speaker at ISBA 2026):

“[I] chose to travel to EurIPS rather than NeurIPS because of the difficulties many others faced in getting into the United States. The smaller nature of EurIPS made it much easier to meet and interact with other scientists. I absolutely loved it and I would love to see it happen again.”

This state of affairs is not going to vanish with Trump adding more countries to the banned country list, 75 at this stage!, and this is a call to arms for ISBA and IMS conference organisers towards planning for multi-hub configurations, since such international organisations cannot exclude a third of the countries in the World from attending their conferences. Which makes our current ISBA survey all the more relevant! I am currently building a mirror meeting for BayesComp 2027 in Aussois, French Alps. For those who cannot or do not wish to travel to Texas for the main conference.

on the future of ISBA meetings (and others)

Posted in Travel, University life with tags , , , , , , , , , on January 4, 2026 by xi'an

As a member of the ad hoc ISBA committee on the future of conferences, along with my friends Guido Consonni, Kate Lee, and Getraud Malsiner-Walli, following a round-table on the topic we held in Venezia for ISBA 2024, I am supporting more sustainability and inclusivity through the creation of mirrors or multiple hubs that allow to broaden the spectrum of major meetings and to multiply the impact of these events to other locations on Earth, for researchers who cannot or are unwilling to travel to these meetings. The following is the link to a survey we designed to assess the opinion of the ISBA membership in this regard, as we realise perspectives can widely differ on this topic. The December ISBA Bulletin also includes a preliminary report of our committee. I obviously encourage all ‘Og’s readers to take part in this survey!

The Committee warmly invites ISBA members to share their perspectives on the environmental sustainability, inclusivity, and accessibility of ISBA meetings, and hopes to stimulate awareness and discussion of these issues within the Society. To this end, we have prepared a five-minute Survey on Meeting Experiences to Inform Future ISBA Events. ISBA members can use the following QR code to access the survey. 

ISBA World meeting(s) 2028

Posted in Books, Travel, University life with tags , , , , , , , , , , , , , , , , on October 28, 2025 by xi'an

An item of news I had missed in the June issue of the ISBA Bulletin is that the 2028 ISBA World meeting will take place in Milwaukee, USA. As pointed out by Michelle Guindani, this is is the first time the main conference of ISBA takes place in the United States since 1993 (which I did not attend). Rotation of locations between strategically located places makes sense, esp. in countries with a large IBSA membership like the US. Unfortunately, and as for BayesComp 2027 at Texas A&M, this will take place during the Trump administration, administration that set an entry prohibition for citizens of only dog knows how many countries by then and arbitrary border checks linked with activism that runs counter to their far right ideology. I thus hope hybrid options will be available for those who cannot or fear to attend in person, with many mirror gatherings like the one we ran for ISBA 2022, towards more inclusivity and social interactions.

EUrIPS!

Posted in pictures, Travel, University life with tags , , , , , , , , , , on July 28, 2025 by xi'an

ellis unconference [not in Hawai’i]

Posted in pictures, Running, Travel, University life with tags , , , , , , , , , , , , , , , , , , , , , , , , , , , , , on July 26, 2023 by xi'an

As ICML 2023 is happening this week, in Hawai’i, many did not have the opportunity to get there, for whatever reason, and hence the ellis (European Lab for Learning {and} Intelligent Systems] board launched [fairly late!] with the help of Hi! Paris an unconference (i.e., a mirror) that is taking place in HEC, Jouy-en-Josas, SW of Paris, for AI researchers presenting works (theirs or others’) presented at ICML 2023. Or not. There was no direct broadcasting of talks as we had (had) in CIRM for ISBA 2020 2021. But some presentations based on preregistered talks. Over 50 people showed up in Jouy.

As it happened, I had quite an exciting bike ride to the HEC campus from home, under a steady rain, crossing a (modest) forest (de Verrières) I had never visited before, despite it being a few km from home, getting a wee bit lost, stopped by a train Xing between Bièvre and Jouy, and ending up at the campus just in time for the first talk (as I had not accounted for the huge altitude differential). Among curiosities met on the way, “giant” sequoias, a Tonkin pond, Chateaubriand’s house.

As always I am rather impressed by the efficiency of AI-ML conferences run, with papers+slides+reviews online, plus extra material as in this example. Lots of papers on diffusion models this year, apparently. (In conjunction with the trend observed at the Flatiron workshop last Fall.) Below are incoherent tidbits from the presentations I attended:

  • exponential convergence of the Sinkhorn algorithm by Alain Durmus and co-authors, with the surprise occurrence of a left Haar measure
  • a paper (by Jerome Baum, Heishiro Kanagawa, and my friend Arthur Gretton) on Stein discrepancy, with an Zanella Stein operator relating to Metropolis-Hastings/Barker since it has expectation zero under stationarity, interesting approach to variable length random variables, not a RJMCMC, but nearby.
  • the occurance of a criticism of the EU GDPR that did not feel appropriate for synthetic data used in privacy protection.
  • the alternative Sliced Wasserstein distance, making me wonder if we could optimally go from measure μ to measure ζ using random directions or how much was lost this way.

\mathbb E[y|X=x] = \mathbb E\left[y\frac{f_{XY}(x,y)}{f_X(x)f_Y(y)}|X=x\right] = \frac{\mathbb E\left[y\frac{f_{XY}(x,y)}{f_Y(y)}|X=x\right]}{f_X(x)}

as (a) densities are replaced with kernel estimates, (b) the outer density may be very small, (c) no variance assessment is provided.

  • Markov score climbing and transport score climbing using a normalising flow, for variational approximation, presented by Christian Naesseth, with a warping transform that sounded like inverting the flow (?)
  • Yazid Janati not presenting their ICML paper State and parameter learning with PARIS particle Gibbs written with Gabriel Cardoso, Sylvain Le Corff, Eric Moulines and Jimmy Olsson, but another work with a diffusion based model to be learned by SMC and a clever call to Tweedie’s formula. (Maurice Kenneth Tweedie, not Richard Tweedie!) Which I just realised I have used many times when working on Bayesian shrinkage estimators