Links for January 2018

  • Bryan Caplan reviews Hanson and Simler, and in several cases makes critiques similar to mine.
  • Viruses face strong adaptive pressure to have small genomes and, as a consequence, their external structure is made of a small number of repeating proteins. This is why they often have a high degree of geometric symmetry.

    Virus genomes also make use of overlapping genes to wring out more efficiency.

  • On security and bugs:

    Daniel Bernstein is the author of qmail. Bernstein created qmail because he was fed us with all of the security vulnerabilities in sendmail. Ten years after the launch of qmail 1.0, and at a time when more than a million of the Internet’s SMTP servers ran either qmail or netqmail, only four known bugs had been found in the qmail 1.0 releases, and no security issues. This paper lays out the principles which made this possible

  • Luke Muehlhauser excerpts Daniel Ellsberg.
  • One of the concepts pursued for ICBM defense:

    Project Excalibur was a Lawrence Livermore National Laboratory (LLNL) research program to develop [a space-based] x-ray laser as a ballistic missile defense (BMD). The concept involved packing large numbers of expendable x-ray lasers around a nuclear device [on an orbiting satellite]. When the device detonated, the x-rays released by the bomb would be focused by the lasers, each of which would be aimed at a target missile. In space, the lack of atmosphere to block the x-rays allowed for attacks over thousands of kilometers.

  • Jeff Kaufman reports on the excellent news that Charity Navigator is beginning the slow push to accounting for effectiveness! GiveWell deserves tremendous credit for instigating this long ago.
  • Useful, basic arguments for and against whether cryptocurrencies (and tokens) are good for anything.
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Reply to Hanson

I was privileged to receive a reply from Robin Hanson on my critique of his largely excellent book The Elephant in the Brain with co-author Kevin Simler. I think in several cases he rebutted something other than what I argued, but I encourage you to read it and judge for yourself.

Given the high-profile book reviews that are probably forthcoming from places like the Wall Street Journal, I thank Robin for taking the time to engage with the little guys!

Replies

I’ll follow Robin’s lead and switch to first names.

Some say we should have been more academic and detailed, while other say we should have been more accessible and less detailed….Count Jess as someone who wanted a longer book.

It’s true that I’d have preferred a longer book with more details, but I think I gestured at ways Kevin and Robin could hold length constant while increasing convincingness. And there are ways of keeping the book accessible while augmenting the rigor (e.g., endnotes), although of course they are more work.

Yes for each motive one can distinguish both a degree of consciousness and also a degree of current vs past adaptation. But these topics were not essential for our main thesis, making credible claims on them takes a lot more evidence and argument, and we already had trouble with trying to cover too much material for one book.

I was mostly happy with how the authors handled the degree of consciousness. However, I think the current- vs past-adaptation distinction is very important for designing institutions, which Kevin and Robin correctly list as one of the main applications of the book’s material. For instance, should the arXiv host comments on papers, and how should they be implemented to avoid pissing contests?… [continue reading]

Comments on Simler and Hanson

Drawing on a large academic literature in topics like sociology, behavioral economics, anthropology, and psychology, and especially the (generalized) theory of signalling, Robin Hanson has assembled a large toolbox for systemically understanding hypocrisy, i.e., the ways in which people’s actions systematically and selfishly deviate from their verbalized explanations. Although he would be the first to admit that many of these ideas have been discovered and rediscovered repeatedly over centuries (or millennia) with varying degrees of clarity, and although there is much I am not convinced by, I find the general framework deeply insightful, and his presentation to be more clear, analytical, and descriptive (rather than disruptively normative) than other accounts. Most of this I have gathered from his renowned blogging at Overcoming Bias, but I have always wished for a more concise (and high status!) form factor that I could point others to. At long last, Hanson and his co-author Kevin Simler have written a nice book that largely satisfies me: The Elephant in the Brain (Amazon). I highly recommend it.

The reason I title these sorts of blog posts “Comments on…” is so I can present some disorganized responses to a work without feeling like I need to build a coherent thesis or pass overall judgment. I do not summarize the book below, so this post will mostly be useful for people who have read it. (You might think of this as a one-sided book club discussion rather than a book review.) But since I will naturally tend to focus on the places where I disagree with the authors, let me emphasize: the basic ideas of this book strike me as profound and probably mostly true.… [continue reading]

Links for December 2017

  • GiveWell has released their yearly top-charities list. CEA has announced they are running donor lotteries in addition to EA Funds. And OpenPhil gives up on finding the most neglected biological research, moves to opportunistic model of just funding good stuff when they see it (which probably has important lessons about the difficulty of transferring human knowledge).
  • Uber driver’s get paid to take footage from a dash camera as raw data for self-driving cars.
  • Blue Origin demos it’s sub-orbital space tourism ride, complete with a full-length video from inside the passenger viewing area:

    You can identify the several minutes of weightlessness by the floating particles.

  • Geoffrey Hinton on visualizing higher dimensions: ‘To deal with hyper-planes in a 14-dimensional space, visualize a 3-D space and say “fourteen” to yourself very loudly. Everyone does it.’
  • The explanation for why Europe is warm for it’s lattitude is more complicated than just the gulf stream: If you turn the jet stream off in climate models, there is a still a large temperature difference.
  • The primary use for my iPad is reading and annotating papers. It’s new secondary use is as a whiteboard during Skype. WebWhiteboard and AWW App both facilitate public whiteboards without needing a login/signup, and work pretty well with your browser on iPad. WebWhiteboard has a limited and dated interface, but is fairly reliable. AWW App has a more modern interface, but seems to have slow/unreliable servers. Then there are a ton of options that require signup, but I don’t know whether any are worth using.
  • By way of Eric Rogstad and Tyler Cowen is this new-to-me idea: In the same way that, theoretically, the value of fiat currency is set by a given demand for a medium of exchange, the “fundamental” value of a bitcoin might be determined by a given demand for stores of value.
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PDF Guru is like Chrome for PDF readers

This is a quick post to highlight an excellent new PDF reader on macOS call PDF Guru (iTunes store). It is a recently revamped version of PDF Reader X.

I’ve only used it for a week, but it’s the best PDF reader I’ve experienced for reading academic articles. It’s snappy and reminds me of Chrome when it first came out. Draggable tabs. Split view. Plays well with Zotero. Can easily add native PDF annotation and search through the existing ones. (And it saves annotations fast when you close the file.Competitors either do this slowly or, like Skim, use a non-native annotation format that can’t be read by other PDF readers.a  ) The UI for “find” displays a lot of info intuitively.Edit 2018-1-12: And you can search for any unicode character! Really useful for searching a document for math.b   Everything is just nicely designed. I haven’t yet run into a limitation on the free version, but it’s worth upgrading to Pro to support the developer (only $20).

Beware that this is the first version following a big re-write of PDF Reader X, and it’s not completely stable. I’ve gotten it to crash a few times, but the developer has been very responsive to feedback and I’d wager on the stability improving soon. (Edit 2018-1-7: After upgrading to the new version, 3.0.20A, a couple weeks ago, I haven’t experienced any crashes. Looks stable.)

I’m advertising Guru because I think the current selection of PDF readers for academic reading is pretty bad.I have no connection to the developer.c   I strongly prefer Guru (instability and all) over these other PDF readers on maxOS that I have tried: FoxIt, Preview, Adobe Acrobat Reader, and Skim.… [continue reading]

Links for November 2017

  • For several months, Fermat’s Library has offered a Chrome extension called Librarian for browsing PDFs on the arXiv that automatically parses references to clickable journal links and bibtex entries. Very recently they added the ability to publicly comment, visible to anyone else running Librarian. Should be lower friction than commenting on (also excellent) SciRate.
  • Just heard about this story showing that the AZ governor means business:

    Three weeks into his new job as Arizona’s governor, Doug Ducey made a move that won over Silicon Valley and paved the way for his state to become a driverless car utopia.

    It was January 2015 and the Phoenix area was about to host the Super Bowl. Mr. Ducey learned that a local regulator was planning a sting on Lyft and Uber drivers to shut down the ride-hailing services for operating illegally. Mr. Ducey, a Republican who was the former chief executive of the ice cream chain Cold Stone Creamery, was furious.

    “It was the exact opposite message we should have been sending,” Mr. Ducey said in an interview. “We needed our message to Uber, Lyft and other entrepreneurs in Silicon Valley to be that Arizona was open to new ideas.” If the state had a slogan, he added, it would include the words “open for business.”

    Mr. Ducey fired the regulator who hatched the idea of going after ride-hailing drivers and shut down the entire agency, the Department of Weights and Measures. By April 2015, Arizona had legalized ride-sharing.

  • The last time a US Air Force bomber downed an enemy plane using its tail gun was 1972, but B-52s — which have been in service for a baffling 65 years — still carried (highly modernized) tail guns up until 1991 when a US air-to-surface missile mistakenly locked on to the tail gun’s radar and nearly destroyed the plane.
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Branches as hidden nodes in a neural net

I had been vaguely aware that there was an important connection between tensor network representations of quantum many-body states (e.g., matrix product states) and artificial neural nets, but it didn’t really click together until I saw Roger Melko’s nice talk on Friday about his recent paper with Torlai et al.:There is a title card about “resurgence” from Francesco Di Renzo’s talk at the beginning of the talk you can ignore. This is just a mistake in KITP’s video system.a  





[Download MP4]   [Other options]

In particular, he sketched the essential equivalence between matrix product states (MPS) and restricted Boltzmann machinesThis is discussed in detail by Chen et al. See also good intuition and a helpful physicist-statistician dictionary from Lin and Tegmark.b   (RBM) before showing how he and collaborators could train an efficient RBM representations of the states of the transverse-field Ising and XXZ models with a small number of local measurements from the true state.

As you’ve heard me belabor ad nauseum, I think identifying and defining branches is the key outstanding task inhibiting progress in resolving the measurement problem. I had already been thinking of branches as a sort of “global” tensor in an MPS, i.e., there would be a single index (bond) that would label the branches and serve to efficiently encode a pure state with long-range entanglement due to the amplification that defines a physical measurement process. (More generally, you can imagine branching events with effects that haven’t propagated outside of some region, such as the light-cone or Lieb-Robinson bound, and you might even make a hand-wavy connection to entanglement renormalization.) But I had little experience with constructing MPSs, and finding efficient representations always seemed like an ad-hoc process yielding non-unique results.… [continue reading]

Links for October 2017

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