Archive for the Books Category

Nature tidbits [11 Dec 2025]

Posted in Books, Kids, pictures, Travel with tags , , , , , , , , , , , , , , , on January 25, 2026 by xi'an

This issue of Nature features dinosaurs on its cover, as in old-time science magazines, yay! In association with a new (tiny) species of tyrannosaurus.

On the Trump 2.0 disaster scene, a reflection on the dangers of the Genesis Mission, which directed by the US Department of Energy to create AI scientists–and give AI companies access to federal datasets. Trump’s attempt to have his own (obviously Big & Beautiful) Manhattan Project?! Unsurprisingly, sounds very messy at this stage.

ICLR 2026 being exposed having 21% of the reviews are fully AI generated using tools from Pangram Labs, in New York. (And around 10% of the submissions being mostly written by AIs as well.) The inevitable evolution of the machine learning conference reviewing process?! Plus a review of the impact of Alphafold for its fifth anniversary. And a discussed paper by Oh & al. on meta-learning, conceiving reinforced learning algorithms that learn how to create learning algorithms. Without engaging with the paper per se I wonder at the degree of incrementality of the proposal. And hence find the catastrophic warning reproduced below rather over-the-top.

“In conclusion, it seems probable that AI will have an increasing role in the design of AI algorithms, a trend for which Oh et al.’s work is a harbinger. It is both exciting and worrying; the potential for intellectual discovery is vast, but the possible acceleration of a technology that already has an outsized societal impact is concerning in a world that is almost certainly not ready for the field’s dizziest possibilities to be realized ahead of schedule.” Joel Lehman

Also a book review of Belluz & Hall’s Food Intelligence, on the harms of processed food and the many myths that come with obesity and diets. Along a comment on diminishing investments on agricultural science being partly to blame for high food prices. And a concentration of the countries involved in R&D. But not helping (me) with the paradox that developed countries struggle to keep farming profitable enough for the farmers. As shown by the perpetual unrest of heavily subsidised farmers in the EU.

a journal of the invasion year

Posted in Books, Kids, Mountains, pictures, Running, Travel, University life, Wines with tags , , , , , , , , , , , , , , , , , , , , , , , on January 24, 2026 by xi'an

Read The Backcountry Rescue Squad at America’s Busiest National Park, a New Yorker long article about a non-profit called BUSAR, for Backcountry Unit Search and Rescue, handling complex search and rescue operations in the Great Smoky Mountains National Park (or Smokies). As usual with the New Yorker  articles, very engaging and well-written! (Which is why I keep reading the journal from the day I discovered it at Ann & George Casella’s home.) Following a visit to the House of Japan in Paris for the Isao Takahata exhibit, where its maps were displayed in the entrance hall, I also read the (French) BD Tokyo Sanpo (sanpo meaning a leisurely stroll or walk) by Florent Chavouet, a travel graphical diary (from a map-addict, like me!) of a yearlong stay in Tokyo that is highly original and beautifully drawn, but practically useless as a travel guide since it was written in 2006. And does not include the most popular districts of Tokyo. (Some of the comments are unpleasant and insensitive to cultural differences, though!)

Cooked buckwheat pancakes in muffin trays, while roasting almonds for butter. Turned out edible esp. with leftover tarama (fish roe) jars bought for the Xmas break, if not particularly nice-looking. And avoided most of the office galette des rois parties plaguing the first weeks of January! (Which would have been detrimental to my current training program, starting with a 95km week over the break.)

Watched with some (moderate) expectations the Apple TV Murderbot, inspired from the fantastic Murderbot diaries by Martha Wells, which did not meet said expectations! The humans in the team sounded and acted too idiotically. And the special effects were quite lame. (But checking the synopsis of the original All Systems Red showed a closed proximity between the book and the show, meaning my own memory units may have been corrupted!)

congrats, Doctor Luciano!

Posted in Books, Kids, Statistics, University life with tags , , , , , , , , , , on January 23, 2026 by xi'an

ChatGPT’ed Monte Carlo exam

Posted in Books, Kids, R, Statistics, University life with tags , , , , , , , , , , on January 22, 2026 by xi'an

This semester I was teaching a graduate course on Monte Carlo methods at Paris Dauphine and I decided to experiment how helpful ChatGPT would prove in writing the final exam. Given my earlier poor impressions, I did not have great expectations and ended up definitely impressed! In total it took me about as long as if I had written the exam by myself, since I went through many iterations, but the outcome was well-suited for my students (or at least for what I expected from my students). The starting point was providing ChatGPT with the articles of Giles on multi-level Monte Carlo and of Jacob et al on unbiased MCMC, and the instruction to turn them into a two-hour exam. Iterations were necessary to break the questions into enough items and to reach the level of mathematical formalism I wanted. Plus add extra questions with R coding. And given the booklet format of the exam, I had to work on the LaTeX formatting (if not on the solution sheet, which spotted a missing assumption in one of my questions). Still a positive experiment I am likely to repeat for the (few) remaining exams I will have to produce!

OWABI⁷, 29 January 2026: Sequential Neural Score Estimation (11am UK time)

Posted in Books, Statistics, University life with tags , , , , , , , , , , on January 21, 2026 by xi'an

Speaker: Louis Sharrock (University College London)

Title: Sequential Neural Score Estimation: Likelihood-free inference with conditional score base diffusion models
Abstract: We introduce Sequential Neural Posterior Score Estimation (SNPSE), a score-based method for Bayesian inference in simulator-based models. Our method, inspired by the remarkable success of score-based methods in generative modelling, leverages conditional score-based diffusion models to generate samples from the posterior distribution of interest. The model is trained using an objective function which directly estimates the score of the posterior. We embed the model into a sequential training procedure, which guides simulations using the current approximation of the posterior at the observation of interest, thereby reducing the simulation cost. We also introduce several alternative sequential approaches, and discuss their relative merits. We then validate our method, as well as its amortised, non-sequential, variant on several numerical examples, demonstrating comparable or superior performance to existing state-of-the-art methods such as Sequential Neural Posterior Estimation (SNPE).
Keywords: diffusion models, simulation based inference, sequential methods.
Reference: L. Sharrock, J. Simons, S. Liu, M. Beaumont, Sequential Neural Score Estimation: Likelihood-Free Inference with Conditional Score Based Diffusion Models. PLMR, 235, 44565-44602, 2024.