Archive for The Lord of the Rings

day five at ISBA 22

Posted in Mountains, pictures, Running, Statistics, Travel, University life with tags , , , , , , , , , , , , , , , , , , , , , , , , , , , , on July 4, 2022 by xi'an

Woke up even earlier today! Which left me time to work on switching to Leonard Cohen’s song titles for my slide frametitles this afternoon (last talk of the whole conference!), run once again to Mon(t) Royal as all pools are closed (Happy Canada Day!, except to “freedom convoy” antivaxxxers.) Which led to me meeting a raccoon by the side of the path (and moroons feeding wildlife).

Had an exciting time at the morning session, where Giacomo Zanella (formerly Warwick) talked on a mixture approach to leave-one-out predictives, with pseudo-harmonic mean representation, averaging inverse density across all observations. Better than harmonic? Some assumptions allow for finite variance, although I am missing the deep argument (in part due to Giacomo’s machine-gun delivery pace!) Then Alicia Corbella (Warwick) presented a promising entry into PDMP by proposing an automated zig-zag sampler. Pointing out on the side to Joris Bierkens’ webpage on the state-of-the-art PDMP methodology. In this approach, joint with with my other Warwick colleagues Simon Spencer and Gareth Roberts, the zig-zag sampler relies on automatic differentiation and sub-sampling and bound derivation, with “no further information on the target needed”. And finaly Chris Carmona presented a joint work with Geoff Nicholls that is merging merging cut posteriors and variational inference to create a meta posterior. Work and talk were motivated by a nice medieval linguistic problem where the latent variables impact the (convergence of the) MCMC algorithm [as in our k-nearest neighbour experience]. Interestingly using normalising [neural spline] flows. The pseudo-posterior seems to depend very much on their modularization rate η, which penalises how much one module influences the next one.

In the aft, I attended sort of by chance [due to a missing speaker in the copula session] to the end of a session on migration modelling, with a talk by Jason Hilton and Martin Hinsch focussing on the 2015’s mass exodus of Syrians through the Mediterranean,  away from the joint evils of al-Hassad and ISIS. As this was a tragedy whose modelling I had vainly tried to contribute to, I was obviously captivated and frustrated (leaning of the IOM missing migrant project!) Fitting the agent-based model was actually using ABC, and most particularly our ABC-PMC!!!

My own and final session had Gareth (Warwick) presenting his recent work with Jun Yang and Kryzs Łatuszyński (Warwick) on the stereoscopic projection improvement over regular MCMC, which involves turning the target into a distribution supported by an hypersphere and hence considering a distribution with compact support and higher efficiency. Kryzs had explained the principle while driving back from Gregynog two months ago. The idea is somewhat similar to our origaMCMC, which I presented at MCqMC 2016 in Stanford (and never completed), except our projection was inside a ball. Looking forward the adaptive version, in the making!

And to conclude this subjective journal from the ISBA conference, borrowing this title by (Westmount born) Leonard Cohen, “Hey, that’s not a way to say goodbye”… To paraphrase Bilbo Baggins, I have not interacted with at least half the participants half as much as I would have liked. But this was still a reunion, albeit in the new Normal. Hopefully, the conference will not have induced a massive COVID cluster on top of numerous scientific and social exchanges! The following days will tell. Congrats to the ISBA 2022 organisers for achieving a most successful event in these times of uncertainty. And looking forward the 2024 next edition in Ca’Foscari, Venezia!!!


the best books of the NYT readers

Posted in Books, Kids, Travel with tags , , , , , , , , , , , , , , , , , , , , , , on February 9, 2022 by xi'an

Two years after Le Monde reported on the list of the 101 favourite novels of [some of] its readers, which I found most fascinating as a sociological entry on said readers, rather than a meaningful ordering of literary monuments (!),  even though it led me to read Damasio’s La Horde du Contrevent, as well as Jean-Philippe Jaworski’s Gagner la Guerre [To the victors go the spoils], The New York Times did something similar to celebrate the Book Review’s 125th anniversary. If on a lesser scale, as it only produces

        1. To Kill a Mockingbird by Harper Lee
        2. The Fellowship of the Ring by J.R.R. Tolkien
        3. 1984 by George Orwell
        4. One Hundred Years of Solitude by Gabriel García Márquez
        5. Beloved by Toni Morrison

as the top five books of the last 125th years, Lee’s, Tolkien’s, and Garcia Márquez’s appearing in both lists, if with a different ranking. (The nomination rules were not exactly the same, though, with only novels for Le Monde and only “recent” books and only one per author for the New York Times.) Here is a longer list of the 25 top contenders, from which NYT readers voted [an opportunity I missed!]:

some of which I had never heard of. And not including a single Faulkner’s… Except for One Hundred Years of Solitude, first published as Cien años de soledad, all novels there were originally written in English. Sadly, the number one book, To Kill a Mockingbird, is also one of the most censored by school boards in the USA! (And so are books by Toni Morrison.)

Seventeen Seconds [40 years ago]

Posted in Books, Kids with tags , , , , , , , , on April 22, 2020 by xi'an

the 101 favourite novels of Le Monde readers

Posted in Books, Kids, pictures with tags , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , on January 1, 2020 by xi'an

Le Monde called its readers to vote for their five favourite novels, with no major surprise in the results, except maybe Harry Potter coming up top. Before Voyage au bout de la nuit and (the predictable) A la recherche du temps perdu. And a complete unknown, Damasio’s La Horde du Contrevent, as 12th and first science fiction book. Above both the Foundation novels (16th). And Dune (32nd). And Hyperion Cantos (52). But no Jules Verne! In a sense, it reflects upon the French high school curriculum on literature that almost uniquely focus on French 19th and 20th books. (Missing also Abe, Conrad, Chandler, Dickens, Ishiguro, Joyce, Kawabata, Madame de Lafayette, Levi, Morante, Naipaul, Rabelais, Rushdie, Singer, and so many others…) Interestingly (or not), Sartre did not make it to the list, despite his literature 1953 Nobel Prize, maybe because so few read the (appalling) books of his chemins de la liberté trilogy.

I did send my vote in due time but cannot remember for certain all the five titles I chose except for Céline’s Voyage au bout de la nuit (2nd), Cormac McCarthy’s The Road (74th) and maybe Fedor Dostoievski’s Brothers Karamazov (24th). Maybe not as I may have included Barbey d’Aurevilly’s L’ensorcelée, Iain Pears’ An instance at the fingerpost, and Graham Greene’s The End of the affair, neither of which made it in the list. Here are some books from the list that would have made it to my own 101 list, although not necessarily as my first choice of titles for authors like Hugo (1793!) or Malraux (l’Espoir). (Warning: Amazon Associate links).

climbing Lothlorien in Middle Earth

Posted in Mountains, pictures, Travel, University life with tags , , , , , , on March 3, 2016 by xi'an

of For the Wednesday. afafternoon break of the Bayesian week at CIRM, a few of us enquired about the possibility of going climbing together and thanks to the good will of local Bayesian climbers ended effectively climbing on a nice type of rock with tiny finger holes! The set of routes was called Middle Earth (located near the notorious jail of Les Beaumettes and on the road to the Calanque de Morgiou) and the routes named after places in the Lord of the Rings. This was my first outdoor climb since the Cascades and while I was not in any way properly trained, I enjoyed this afternoon tremendously, no less for climbing a route called Lothlorien! (There are also Rohan and Gondor if you are partial to those other places…) But also for having a great time with old and new friends, in very mild weather and away from the blistery mistral wind. And for this residual tingling feeling at the end of my fingers…

%d bloggers like this: