Archive for climbing

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…

Bayesian week in a statistics month at CIRM

Posted in Books, Mountains, pictures, Running, Statistics, Travel, University life, Wines with tags , , , , , , , , , , , on February 28, 2016 by xi'an

Calanque de Morgiou, Marseille, July 7, 2010As posted earlier, this week is a Bayesian week at CIRM, the French mathematical society centre near Marseilles. Where we meet with about 80 researchers and students interested in Bayesian statistics, from all possible sides. (And possibly in climbing in the Calanques and trail running, if not swimming at this time of year…) With Jean-Michel we will be teaching a short course on Bayesian computational methods, namely ABC and MCMC, over the first two days… Here are my slides for the MCMC side:

As should be obvious from the first slides, this is a very introductory course that should only appeal to students with no previous exposure. The remainder of the week will see advanced talks on the state-of-the-art Bayesian computational methods, including some on noisy MCMC and on the mysterious expectation-propagation technique.

Everest [film review]

Posted in Books, Kids, Mountains, pictures with tags , , , , , , , on December 29, 2015 by xi'an

A few weeks ago, I saw Everest with my daughter and was less than impressed. In fact, I had read the Karkauer book, Into Thin Air, quite a while ago (actually it had been recommended to me by George Casella, who thought this notion of climbing Everest on a commercial expedition was sheer madness!) and enjoyed it to the point I bought the French translation for my father. The book exposed the contradictions in the commercial approach to climbing Everest (and other mountains). From installing fixed ropes all the way to the top to guiding inexperienced or unfit clients to the top with a fair chance of not bringing them back. (It is not that I opposed guided mountaineering, hiring guides in most cases I am out of my comfort zone, i.e., above scrambling. But hiring a guide means that he or she is making decisions about where and when we can go and that I cannot argue when we have to turn back, as it happens about half the time. Obviously, I often feel we could try at least the next level of difficulty, however I consider I gave up that choice when hiring the guide. Which is most likely wise!) The book also covered how the accompanying guides dealt [or not] with the clients stranded above the highest camps. And the murky issue of the empty oxygen bottles that helped into the final disaster.

The movie did not enter into such details. Nothing revolutionary there, as feelings and hypotheses do not turn up well into a scenario, even though the script writer seemed too careful in depicting everyone in a rather positive light! In my opinion, the film did not do enough to connect the deadly outcome of this Everest climb with the commercial pressure of the success rate advertised by this company. Hence with the competition between companies and guides. It all sounded too much like the old superficial drivel that mountains are dangerous places, the possibility of death is part of the climbing ethos and glory, and so on. Missing the fact that the clients were not taking part in many aspects of climbing, from carrying gear, to reconnoitring, to setting camps, etc. That they were not equal to the task of climbing Everest. Thus ending up as an unconvincing melodrama, with everyone crying, a miraculous resuscitation, and an heroic helicopter rescue. And with surprisingly very little on the climbing itself, which sounded boring in the movie. And, last but not least, with no major role for the Sherpas. Who did partake to the rescue attempts in the real story. And of course laid all the ropes, set the tents and brought oxygen bottles almost to the top. Now that helicopters can theoretically reach all the way to the top and that there are talks of installing a permanent ladder on Hillary’s step, there is little doubt the pressure will grow and similar disasters happen again. Unsurprisingly, Krakauer did not like the movie very much, as he called it ‘a total bull’.

climbing in Mazama, WA

Posted in Mountains, pictures, Running, Travel with tags , , , , , , , on September 12, 2015 by xi'an

We spent the last few days of our Washington State vacations in Mazama, last hamlet up the MethowmadXama Valley and I found upon arrival that one of the four houses there hosted a mountaineering store and a climbing guide company! With too little time to organise a whole day climb of the nearby Liberty Bells, I spent a short morning with Brittany climbing a nearby bolted cliff called Fun Rock. Thanks to Brittany’s efficiency, I managed to climb six pitches, including two chimneys, which I particularly affectionate!, and a slightly more challenging route in the upper fives. I was very glad to work with Brittany, who is an amazing young woman now full time mountain guide and running coach, besides being a terrific climber and long-distance runner. Her website, Magnetic North, is definitely worth a visit….

Advances in scalable Bayesian computation [day #3]

Posted in Books, Mountains, pictures, R, Statistics, University life with tags , , , , , , , , , , on March 6, 2014 by xi'an

polyptych painting within the TransCanada Pipeline Pavilion, Banff Centre, Banff, March 21, 2012We have now gone over the midpoint of our workshop Advances in Scalable Bayesian Computation with three talks in the morning and an open research or open air afternoon. (Maybe surprisingly I chose to stay indoors and work on a new research topic rather than trying cross-country skiing!) If I must give a theme for the day, it would be (jokingly) corporate Big data, as the three speakers spoke of problems and solutions connected with Google, Facebook and similar companies. First, Russ Salakhutdinov presented some  hierarchical structures on multimedia data, like connecting images and text, with obvious applications on Google. The first part described Boltzman machines with impressive posterior simulations of characters and images. (Check the video at 45:00.) Then Steve Scott gave us a Google motivated entry to embarrassingly parallel algorithms, along the lines of papers recently discussed on the ‘Og. (Too bad we forgot to start the video at the very beginning!) One of the novel things in the talk (for me) was the inclusion of BART in this framework, with the interesting feature that using the whole prior on each machine was way better than using a fraction of the prior, as predicted by the theory! And Joaquin Quinonero Candela provided examples of machine learning techniques used by Facebook to suggest friends and ads in a most efficient way (techniques remaining hidden!).

Even though the rest of the day was free, the two hours of exercising between the pool in the early morning and the climbing wall in the late afternoon left me with no energy to experiment curling with a large subsample of the conference attendees, much to my sorrow!