nhaliday + org:bleg   362

Sequence Modeling with CTC
A visual guide to Connectionist Temporal Classification, an algorithm used to train deep neural networks in speech recognition, handwriting recognition and other sequence problems.
acmtariat  techtariat  org:bleg  nibble  better-explained  machine-learning  deep-learning  visual-understanding  visualization  analysis  let-me-see  research  sequential  audio  classification  model-class  exposition  language  acm  approximation  comparison  markov  iteration-recursion  concept  atoms  distribution  orders  DP  heuristic  optimization  trees  greedy  matching  gradient-descent 
december 2017 by nhaliday
Is the speed of light really constant?
So what if the speed of light isn’t the same when moving toward or away from us? Are there any observable consequences? Not to the limits of observation so far. We know, for example, that any one-way speed of light is independent of the motion of the light source to 2 parts in a billion. We know it has no effect on the color of the light emitted to a few parts in 1020. Aspects such as polarization and interference are also indistinguishable from standard relativity. But that’s not surprising, because you don’t need to assume isotropy for relativity to work. In the 1970s, John Winnie and others showed that all the results of relativity could be modeled with anisotropic light so long as the two-way speed was a constant. The “extra” assumption that the speed of light is a uniform constant doesn’t change the physics, but it does make the mathematics much simpler. Since Einstein’s relativity is the simpler of two equivalent models, it’s the model we use. You could argue that it’s the right one citing Occam’s razor, or you could take Newton’s position that anything untestable isn’t worth arguing over.

nibble  scitariat  org:bleg  physics  relativity  electromag  speed  invariance  absolute-relative  curiosity  philosophy  direction  gedanken  axioms  definition  models  experiment  space  science  measurement  volo-avolo  synchrony  uniqueness  multi  pdf  piracy  study  article 
november 2017 by nhaliday
If Quantum Computers are not Possible Why are Classical Computers Possible? | Combinatorics and more
As most of my readers know, I regard quantum computing as unrealistic. You can read more about it in my Notices AMS paper and its extended version (see also this post) and in the discussion of Puzzle 4 from my recent puzzles paper (see also this post). The amazing progress and huge investment in quantum computing (that I presented and update  routinely in this post) will put my analysis to test in the next few years.
tcstariat  mathtariat  org:bleg  nibble  tcs  cs  computation  quantum  volo-avolo  no-go  contrarianism  frontier  links  quantum-info  analogy  comparison  synthesis  hi-order-bits  speedometer  questions  signal-noise 
november 2017 by nhaliday
Introduction to Scaling Laws

Galileo’s Discovery of Scaling Laws: https://www.mtholyoke.edu/~mpeterso/classes/galileo/scaling8.pdf
Days 1 and 2 of Two New Sciences

An example of such an insight is “the surface of a small solid is comparatively greater than that of a large one” because the surface goes like the square of a linear dimension, but the volume goes like the cube.5 Thus as one scales down macroscopic objects, forces on their surfaces like viscous drag become relatively more important, and bulk forces like weight become relatively less important. Galileo uses this idea on the First Day in the context of resistance in free fall, as an explanation for why similar objects of different size do not fall exactly together, but the smaller one lags behind.
nibble  org:junk  exposition  lecture-notes  physics  mechanics  street-fighting  problem-solving  scale  magnitude  estimate  fermi  mental-math  calculation  nitty-gritty  multi  scitariat  org:bleg  lens  tutorial  guide  ground-up  tricki  skeleton  list  cheatsheet  identity  levers  hi-order-bits  yoga  metabuch  pdf  article  essay  history  early-modern  europe  the-great-west-whale  science  the-trenches  discovery  fluid  architecture  oceans  giants  tidbits 
august 2017 by nhaliday
Correlated Equilibria in Game Theory | Azimuth
Given this, it’s not surprising that Nash equilibria can be hard to find. Last September a paper came out making this precise, in a strong way:

• Yakov Babichenko and Aviad Rubinstein, Communication complexity of approximate Nash equilibria.

The authors show there’s no guaranteed method for players to find even an approximate Nash equilibrium unless they tell each other almost everything about their preferences. This makes finding the Nash equilibrium prohibitively difficult to find when there are lots of players… in general. There are particular games where it’s not difficult, and that makes these games important: for example, if you’re trying to run a government well. (A laughable notion these days, but still one can hope.)

Klarreich’s article in Quanta gives a nice readable account of this work and also a more practical alternative to the concept of Nash equilibrium. It’s called a ‘correlated equilibrium’, and it was invented by the mathematician Robert Aumann in 1974. You can see an attempt to define it here:
baez  org:bleg  nibble  mathtariat  commentary  summary  news  org:mag  org:sci  popsci  equilibrium  GT-101  game-theory  acm  conceptual-vocab  concept  definition  thinking  signaling  coordination  tcs  complexity  communication-complexity  lower-bounds  no-go  liner-notes  big-surf  papers  research  algorithmic-econ  volo-avolo 
july 2017 by nhaliday
How to Escape Saddle Points Efficiently – Off the convex path
A core, emerging problem in nonconvex optimization involves the escape of saddle points. While recent research has shown that gradient descent (GD) generically escapes saddle points asymptotically (see Rong Ge’s and Ben Recht’s blog posts), the critical open problem is one of efficiency — is GD able to move past saddle points quickly, or can it be slowed down significantly? How does the rate of escape scale with the ambient dimensionality? In this post, we describe our recent work with Rong Ge, Praneeth Netrapalli and Sham Kakade, that provides the first provable positive answer to the efficiency question, showing that, rather surprisingly, GD augmented with suitable perturbations escapes saddle points efficiently; indeed, in terms of rate and dimension dependence it is almost as if the saddle points aren’t there!
acmtariat  org:bleg  nibble  liner-notes  machine-learning  acm  optimization  gradient-descent  local-global  off-convex  time-complexity  random  perturbation  michael-jordan  iterative-methods  research  learning-theory  math.DS  iteration-recursion 
july 2017 by nhaliday
Unsupervised learning, one notion or many? – Off the convex path
(Task A) Learning a distribution from samples. (Examples: gaussian mixtures, topic models, variational autoencoders,..)

(Task B) Understanding latent structure in the data. This is not the same as (a); for example principal component analysis, clustering, manifold learning etc. identify latent structure but don’t learn a distribution per se.

(Task C) Feature Learning. Learn a mapping from datapoint → feature vector such that classification tasks are easier to carry out on feature vectors rather than datapoints. For example, unsupervised feature learning could help lower the amount of labeled samples needed for learning a classifier, or be useful for domain adaptation.

Task B is often a subcase of Task C, as the intended user of “structure found in data” are humans (scientists) who pour over the representation of data to gain some intuition about its properties, and these “properties” can be often phrased as a classification task.

This post explains the relationship between Tasks A and C, and why they get mixed up in students’ mind. We hope there is also some food for thought here for experts, namely, our discussion about the fragility of the usual “perplexity” definition of unsupervised learning. It explains why Task A doesn’t in practice lead to good enough solution for Task C. For example, it has been believed for many years that for deep learning, unsupervised pretraining should help supervised training, but this has been hard to show in practice.
acmtariat  org:bleg  nibble  machine-learning  acm  thinking  clarity  unsupervised  conceptual-vocab  concept  explanation  features  bayesian  off-convex  deep-learning  latent-variables  generative  intricacy  distribution  sampling 
june 2017 by nhaliday
::.Václav Havel.:: The Power of the Powerless/Havel's greengrocer
"The Power of the Powerless" (October 1978) was originally written ("quickly," Havel said later) as a discussion piece for a projected joint Polish Czechoslovak volume of essays on the subject of freedom and power. All the participants were to receive Havel's essay, and then respond to it in writing. Twenty participants were chosen on both sides, but only the Czechoslovak side was completed. Meanwhile, in May 1979, some of the Czechoslovak contributors who were also members of VONS (the Committee to Defend the Unjustly Prosecuted), including Havel, were arrested, and it was decided to go ahead and "publish" the Czechoslovak contributions separately.

Havel's essay has had a profound impact on Eastern Europe. Here is what Zbygniew Bujak, a Solidarity activist, told me: "This essay reached us in the Ursus factory in 1979 at a point when we felt we were at the end of the road. Inspired by KOR [the Polish Workers' Defense Committee], we had been speaking on the shop floor, talking to people, participating in public meetings, trying to speak the truth about the factory, the country, and politics. There came a moment when people thought we were crazy. Why were we doing this? Why were we taking such risks? Not seeing any immediate and tangible results, we began to doubt the purposefulness of what we were doing. Shouldn’t we be coming up with other methods, other ways?

"Then came the essay by Havel. Reading it gave us the theoretical underpinnings for our activity. It maintained our spirits; we did not give up, and a year later—in August 1980—it became clear that the party apparatus and the factory management were afraid of us. We mattered. And the rank and file saw us as leaders of the movement. When I look at the victories of Solidarity, and of Charter 77, I see in them an astonishing fulfillment of the prophecies and knowledge contained in Havel's essay."

Translated by Paul Wilson, "The Power of the Powerless" has appeared several times in English, foremost in The Power of the Powerless: Citizens Against the State in Central-Eastern Europe, edited by John Keane, with an Introduction by Steven Lukes (London: Hutchinson, 1985). That volume includes a selection of nine other essays from the original Czech and Slovak collection.


THE MANAGER of a fruit-and-vegetable shop places in his window, among the onions and carrots, the slogan: "Workers of the world, unite!" Why does he do it? What is he trying to communicate to the world? Is he genuinely enthusiastic about the idea of unity among the workers of the world? Is his enthusiasm so great that he feels an irrepressible impulse to acquaint the public with his ideals? Has he really given more than a moment's thought to how such a unification might occur and what it would mean?

I think it can safely be assumed that the overwhelming majority of shopkeepers never think about the slogans they put in their windows, nor do they use them to express their real opinions. That poster was delivered to our greengrocer from the enterprise headquarters along with the onions and carrots. He put them all into the window simply because it has been done that way for years, because everyone does it, and because that is the way it has to be. If he were to refuse, there could be trouble. He could be reproached for not having the proper decoration in his window; someone might even accuse him of disloyalty. He does it because these things must be done if one is to get along in life. It is one of the thousands of details that guarantee him a relatively tranquil life "in harmony with society," as they say.

Obviously the greengrocer is indifferent to the semantic content of the slogan on exhibit; he does not put the slogan in his window from any personal desire to acquaint the public with the ideal it expresses. This, of course, does not mean that his action has no motive or significance at all, or that the slogan communicates nothing to anyone. The slogan is really a sign, and as such it contains a subliminal but very definite message. Verbally, it might be expressed this way: "I, the greengrocer XY, live here and I know what I must do. I behave in the manner expected of me. I can be depended upon and am beyond reproach. I am obedient and therefore I have the right to be left in peace." This message, of course, has an addressee: it is directed above, to the greengrocer's superior, and at the same time it is a shield that protects the greengrocer from potential informers. The slogan's real meaning, therefore, is rooted firmly in the greengrocer's existence. It reflects his vital interests. But what are those vital interests?


Individuals need not believe all these mystifications, but they must behave as though they did, or they must at least tolerate them in silence, or get along well with those who work with them. For this reason, however, they must live within a lie. They need not accept the lie. It is enough for them to have accepted their life with it and in it. For by this very fact, individuals confirm the system, fulfill the system, make the system, are the system.

Live Not By Lies: http://www.orthodoxytoday.org/articles/SolhenitsynLies.php
- Alexander Solzhenitsyn
We do not exhort ourselves. We have not sufficiently matured to march into the squares and shout the truth our loud or to express aloud what we think. It's not necessary.

It's dangerous. But let us refuse to say that which we do not think.

This is our path, the easiest and most accessible one, which takes into account out inherent cowardice, already well rooted. And it is much easier—it's dangerous even to say this—than the sort of civil disobedience which Gandhi advocated.

Our path is to talk away fro the gangrenous boundary. If we did not paste together the dead bones and scales of ideology, if we did not sew together the rotting rags, we would be astonished how quickly the lies would be rendered helpless and subside.

That which should be naked would then really appear naked before the whole world.

So in our timidity, let each of us make a choice: Whether consciously, to remain a servant of falsehood—of course, it is not out of inclination, but to feed one's family, that one raises his children in the spirit of lies—or to shrug off the lies and become an honest man worthy of respect both by one's children and contemporaries.

The Kolmogorov option: http://www.scottaaronson.com/blog/?p=3376
As far as I can tell, the answer is simply: because Kolmogorov knew better than to pick fights he couldn’t win. He judged that he could best serve the cause of truth by building up an enclosed little bubble of truth, and protecting that bubble from interference by the Soviet system, and even making the bubble useful to the system wherever he could—rather than futilely struggling to reform the system, and simply making martyrs of himself and all his students for his trouble.

I don't really agree w/ this


At first regarded as a hero by Americans, he eventually found his popularity waning, thanks in part to his controversial 1978 commencement address at Harvard University.


"Without any censorship, in the West fashionable trends of thought and ideas are carefully separated from those which are not fashionable; nothing is forbidden, but what is not fashionable will hardly ever find its way into periodicals or books or be heard in colleges. Legally your researchers are free, but they are conditioned by the fashion of the day. There is no open violence such as in the East; however, a selection dictated by fashion and the need to match mass standards frequently prevents independent-minded people from giving their contribution to public life."

“The press has become the greatest power within the Western countries,” he also insisted, “more powerful than the legislature, the executive and the judiciary. One would then like to ask: by what law has it been elected and to whom is it responsible?”

Our Culture, What’s Left Of It: http://archive.frontpagemag.com/readArticle.aspx?ARTID=7445
FP: You mention how 19th century French aristocrat, the Marquis de Custine, made several profound observations on how border guards in Russia wasted his time pushing their weight around in stupid and pointless ways, and that this is connected to the powerlessness that humans live under authoritarianism. Tell us a bit more of how this dynamic works in Russia.

Dalrymple: With regard to Russia, I am not an expert, but I have an interest in the country. I believe that it is necessary to study 19th century Russian history to understand the modern world. I suspect that the characteristic of Russian authoritarianism precedes the Soviet era (if you read Custine, you will be astonished by how much of what he observed prefigured the Soviet era, which of course multiplied the tendencies a thousand times).


FP: You make the shrewd observation of how political correctness engenders evil because of “the violence that it does to people’s souls by forcing them to say or imply what they do not believe, but must not question.” Can you talk about this a bit?

Dalrymple: Political correctness is communist propaganda writ small. In my study of communist societies, I came to the conclusion that the purpose of communist propaganda was not to persuade or convince, nor to inform, but to humiliate; and therefore, the less it corresponded to reality the better. When people are forced to remain silent when they are being told the most obvious lies, or even worse when they are forced to repeat the lies themselves, they lose once and for all their sense of probity. To assent to obvious lies is to co-operate with evil, and in some small way to become evil oneself. One's standing to resist anything is thus eroded, and even destroyed. A society of emasculated liars is easy to control. I think if you examine political correctness, it has the same effect and is … [more]
classic  politics  polisci  history  mostly-modern  eastern-europe  authoritarianism  communism  antidemos  revolution  essay  org:junk  government  power  reflection  clown-world  quotes  lived-experience  nascent-state  truth  info-dynamics  realness  volo-avolo  class-warfare  multi  domestication  courage  humility  virtu  individualism-collectivism  n-factor  academia  giants  cold-war  tcstariat  aaronson  org:bleg  nibble  russia  science  parable  civil-liberty  exit-voice  big-peeps  censorship  media  propaganda  gnon  isteveish  albion  identity-politics  westminster  track-record  interview  wiki  reference  jargon  aphorism  anarcho-tyranny  managerial-state  zeitgeist  rot  path-dependence  paleocon  orwellian  solzhenitsyn  fashun  status  usa  labor  left-wing  organization  intel  capitalism  competition  long-short-run  patience  food  death 
june 2017 by nhaliday
- the genetic book of the dead [Dawkins]
- complementarity [Frank Wilczek]
- relative information
- effective theory [Lisa Randall]
- affordances [Dennett]
- spontaneous symmetry breaking
- relatedly, equipoise [Nicholas Christakis]
- case-based reasoning
- population reasoning (eg, common law)
- criticality [Cesar Hidalgo]
- Haldan's law of the right size (!SCALE!)
- polygenic scores
- non-ergodic
- ansatz
- state [Aaronson]: http://www.scottaaronson.com/blog/?p=3075
- transfer learning
- effect size
- satisficing
- scaling
- the breeder's equation [Greg Cochran]
- impedance matching

- reciprocal altruism
- life history [Plomin]
- intellectual honesty [Sam Harris]
- coalitional instinct (interesting claim: building coalitions around "rationality" actually makes it more difficult to update on new evidence as it makes you look like a bad person, eg, the Cathedral)
basically same: https://twitter.com/ortoiseortoise/status/903682354367143936

more: https://www.edge.org/conversation/john_tooby-coalitional-instincts

interesting timing. how woke is this dude?
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may 2017 by nhaliday
Discovering Limits to Growth | Do the Math
One may of course be skeptical that this general trend will also apply to the growth of our technology and economy at large, as innovation seems to continually postpone our clash with the ceiling, yet it seems inescapable that it must. For in light of what we know about physics, we can conclude that exponential growth of the kinds we see today, in technology in particular and in our economy more generally, must come to an end, and do so relatively soon.
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march 2017 by nhaliday
Futuristic Physicists? | Do the Math
interesting comment: https://westhunt.wordpress.com/2014/03/05/outliers/#comment-23087
referring to timelines? or maybe also the jetpack+flying car (doesn't seem physically impossible; at most impossible for useful trip lengths)?

Topic Mean % pessim. median disposition
1. Autopilot Cars 1.4 (125 yr) 4 likely within 50 years
15. Real Robots 2.2 (800 yr) 10 likely within 500 years
13. Fusion Power 2.4 (1300 yr) 8 likely within 500 years
10. Lunar Colony 3.2 18 likely within 5000 years
16. Cloaking Devices 3.5 32 likely within 5000 years
20. 200 Year Lifetime 3.3 16 maybe within 5000 years
11. Martian Colony 3.4 22 probably eventually (>5000 yr)
12. Terraforming 4.1 40 probably eventually (> 5000 yr)
18. Alien Dialog 4.2 42 probably eventually (> 5000 yr)
19. Alien Visit 4.3 50 on the fence
2. Jetpack 4.1 64 unlikely ever
14. Synthesized Food 4.2 52 unlikely ever
8. Roving Astrophysics 4.6 64 unlikely ever
3. Flying “Cars” 3.9 60 unlikely ever
7. Visit Black Hole 5.1 74 forget about it
9. Artificial Gravity 5.3 84 forget about it
4. Teleportation 5.3 85 forget about it
5. Warp Drive 5.5 92 forget about it
6. Wormhole Travel 5.5 96 forget about it
17. Time Travel 5.7 92 forget about it
org:bleg  nibble  data  poll  academia  higher-ed  prediction  speculation  physics  technology  gravity  geoengineering  space  frontier  automation  transportation  energy-resources  org:edu  expert  scitariat  science  no-go  big-picture  wild-ideas  the-world-is-just-atoms  applications  multi  west-hunter  optimism  pessimism  objektbuch  regularizer  s:*  c:**  🔬  poast  ideas  speedometer  whiggish-hegelian  scifi-fantasy  expert-experience  expansionism 
march 2017 by nhaliday
Peter Norvig, the meaning of polynomials, debugging as psychotherapy | Quomodocumque
He briefly showed a demo where, given values of a polynomial, a machine can put together a few lines of code that successfully computes the polynomial. But the code looks weird to a human eye. To compute some quadratic, it nests for-loops and adds things up in a funny way that ends up giving the right output. So has it really ”learned” the polynomial? I think in computer science, you typically feel you’ve learned a function if you can accurately predict its value on a given input. For an algebraist like me, a function determines but isn’t determined by the values it takes; to me, there’s something about that quadratic polynomial the machine has failed to grasp. I don’t think there’s a right or wrong answer here, just a cultural difference to be aware of. Relevant: Norvig’s description of “the two cultures” at the end of this long post on natural language processing (which is interesting all the way through!)
mathtariat  org:bleg  nibble  tech  ai  talks  summary  philosophy  lens  comparison  math  cs  tcs  polynomials  nlp  debugging  psychology  cog-psych  complex-systems  deep-learning  analogy  legibility  interpretability 
march 2017 by nhaliday
ExtraTricky - A Rant About AlphaGo Discussions
The most important idea to be able to analyze endgames is the idea of adding two games together. The sum of two games is another game where on your turn you pick one of the two games to play in. So you could imagine a game of "chess plus checkers" where each turn is either a turn on the chess board or a turn on the checkers board. Say your opponent makes a move on the chess board. Now you have a choice: do you want to respond to that move also on the chess board, or is it better to take a turn on the checkers board and accept the potential loss of allowing two consecutive chess moves?

If you were to actually add a game of chess and a game of checkers, you'd have to also determine a way to say who wins. I'm going to conveniently avoid talking about that for general games, because for Go positions the answer is simple: add up the points from each game. So you could imagine a game of "Go plus Go" where you're playing simultaneously on two boards, and on your turn you pick one of the boards to play on. At the end of the game, instead of counting territory from just one board, you count it from both.

As it turns out, when a Go game reaches the final stages, the board is typically partitioned into small areas that don't interact with each other. In these cases, even though these sections exist on the same board, you can think of them being entirely separate games being added together. Once we have that, there's still the question: how do you determine which section to play in?
extratricky  oly  games  deepgoog  thinking  things  analysis  nibble  org:bleg 
february 2017 by nhaliday
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