Archive for birthday

お山は晴天 [not!]

Posted in Mountains, Travel with tags , , , , , , , , , , , , , , on September 17, 2026 by xi'an


As a follow-up to the Akaike lecture, I was hoping to summit Fuji-san for my 65th B’day but it did not work out, thanks to a rain storm (remnant of a typhoon) keeping Fuji-san out of reach that day (and even blocking the access road for a few hours by causing a landslide). The warden were strongly discouraging all entries including mine’s, with reasonable arguments (that mountain rescue would be unavailable). I thus only experienced the less appealing aspects of Fuji’rism, from the predictable, gaudy souvenir shops at the stations, to some Western summiteers walking (and loudly talking) like decorated war heroes, to the crowded buses to access or leave the 5th station—I got stuck next to two French speaking Swiss boasting of their hike and travel experiences in Japan, entitled, obnoxious, and entirely oblivious to the fact that they were the loudest people on the bus!, to the noisy hostel where it seemed a group was departing every half-hour of the short night (even though in the end only four people got access to the trail and ended up turning back). With no glimpse of Fuji-san the entire stay. The title is a traditional sentence hoping for a clear day when summiting Fuji-san.

Éric turns 60

Posted in Books, Mountains, Statistics, Travel, University life with tags , , , , , , , , , , , , , on July 14, 2023 by xi'an

Conférence en l’honneur d’Eric Moulines

13-14 sept. 2023 IHP Paris (France)

There will be a conference / Festschrift held for the 60th birthday of Eric Moulines [longtime friend, coauthor, ERC Synergy co-PI, whom I almost killed when missing a catch on Dent Parrachée!] at Institut Henri Poincaré, Paris, on 13 and 14 September 2023. Registration is free, but compulsory.

These two days will celebrate the variety of the research topics covered by Eric Moulines over thirty years and the broad and thorough impact he had on many different scientific communities. In particular, through more than 100 papers published in highly selective journals, he has made essential contributions in as many fields as statistical signal processing, time series analysis, inference in partially observed models, non-linear filtering, computational statistics, Markov Chain Monte Carlo, stochastic optimization methods, as well as hot topics related to artificial intelligence like generative models, variational inference or Bayesian machine learning.

what a party!

Posted in pictures, Statistics, Travel, University life, Wines with tags , , , , , , , , , , , , , , on September 13, 2021 by xi'an

We ended up having a terrific b’day party last Thursday after noon, with about 30 friends listening in Institut Henri Poincaré to Florence, Pierre, and Sylvia giving lectures on my favourite themes, namely ABC, MCMC, and mixture inference. Incl. subtle allusions to my many idiosyncrasies in three different flavours!  And a limited number of anecdotes, incl. the unavoidable Cancún glasses disaster! We later headed to a small Ethiopian restaurant located on the other side of the Panthéon, rue de l’Ecole Polytechnique (rather than on the nearby rue Laplace!), which was going to be too tiny for us, especially in these COVID times, until the sky cleared up and the restaurant set enough tables in the small street to enjoy their injeras and wots till almost midnight. The most exciting episode of the evening came when someone tried to steal some of our bags that had been stored in a back room and when Tony spotted the outlier and chased him till the thief dropped the bags..! Thanks to Tony for saving the evening and our computers!!! To Éric, Jean-Michel and Judith for organising this 9/9 event (after twisting my arm just a wee bit). And to all my friends who joined the party, some from far away…

B’day party!

Posted in Kids, Statistics, Travel, University life with tags , , , , , on August 30, 2021 by xi'an

Rao-Blackwellisation in the MCMC era

Posted in Books, Statistics, University life with tags , , , , , , , , , , on January 6, 2021 by xi'an

A few months ago, as indicated on this blog, I was contacted by ISR editors to write a piece on Rao-Blackwellisation, towards a special issue celebrating Calyampudi Radhakrishna Rao’s 100th birthday. Gareth Roberts and I came up with this survey, now on arXiv, discussing different aspects of Monte Carlo and Markov Chain Monte Carlo that pertained to Rao-Blackwellisation, one way or another. As I discussed the topic with several friends over the Fall, it appeared that the difficulty was more in setting the boundaries. Than in finding connections. In a way anything conditioning or demarginalising or resorting to auxiliary variates is a form of Rao-Blackwellisation. When re-reading the JASA Gelfand and Smith 1990 paper where I first saw the link between the Rao-Blackwell theorem and simulation, I realised my memory of it had drifted from the original, since the authors proposed there an approximation of the marginal based on replicas rather than the original Markov chain. Being much closer to Tanner and Wong (1987) than I thought. It is only later that the true notion took shape. [Since the current version is still a draft, any comment or suggestion would be most welcomed!]