All of mfb's Comments + Replies

mfb00

Hmm, the whole statement is ' "is false when preceded by its quotation" is false when preceded by its quotation.', and it is not preceded by its quotation.

1A1987dM
"Yields falsehood when preceded by its quotation" yields falsehood when preceded by its quotation.
mfb10

If mathematical details matter, they should be specified (or be clear anyway - e.g. you don't define "real numbers" in a physics paper). Physics can need some domain knowledge, but knowledge alone is completely useless - you need the same general reasoning ability as in mathematics to do anything (both for experimental and theoretical physics).

In fact, many physics problems get solved by reducing them to mathematical problems (that is the physics part) and then solving those mathematical problems (still considered as "solving the physical problem", but purely mathematics)

1[anonymous]
One of the barriers I run into when I delve into physics is that I have a very rationalist approach to math. I hate terminology and I want as little of it as possible in my reasoning. Physics has rather high barriers in that way in that academic physicists don't really like mathematical rigour, and don't precisely specify, say, the abstract algebraic axioms of the structures they are using. But when I get to a point of being able to specify what structure is behind a physical theory, I can usually intuit it readily. Physics is domain knowledge compared to mathematical reasoning ability.
mfb20

I guess we can answer question 2 under the condition that the majority of humans falls under the definition of conscious, and we don't require 24/7 consciousness from the brain emulation.

mfb160

I cannot imagine how moving sodium and potassium ions could lead to consciousness if moving electrons cannot.

In addition, I think consciousness is a gradual process. There is no single point in the development of a human where it suddenly gets conscious, and in the same way, there was no conscious child of two non-conscious parents.

mfb40

"There are a million reasons to learn a foreign language, but it'd be a very costly way to improve rationality."

It is a "free" side-effect if you belong to the 95% of the world population without English as native language.

mfb00

So much room for improvements in healthcare even without new stuff :).

mfb00

I think it arises at the point where you did not even consider the alternative. This is a very subjective thing, of course.

If the probability of the actual outcome was really negligible (with a perfect evaluation by the prediction-maker), this should not influence the evaluation of predictions in a significant way. If the probability was significant, it is likely that the prediction-maker considered it. If not, count it as false.

mfb00

I think (5.) can give a significant difference (together with 1 and 2 - I would not expect so much trouble from 3 and 4). Imagine a series of 4 statements, where the last three basically require the first one. If all 4 are correct, it is easy to check every single statement, giving 4 correct predictions. But if the first one is wrong - and the others have to be wrong as consequence - Kurzweil might count the whole block as one wrong prediction.

For predictions judged by multiple volunteers, it might be interesting to check how much they deviate from each other. This gives some insight how important (1.) to (3.) are. satt looked at that, but I don't know which conclusion we can draw from that.

mfb00

That might sound weird, but do we have any evidence that our time follows the standard numbers (or a continuous version of them) only? Is it even possible to get such evidence? Maybe our turing machine (looking for contradictions in PA) stops at -2* - "we" cannot see it, as "we" are on the standard numbers only, experiencing only effects of previous standard numbers.

4Qiaochu_Yuan
Time is a property of the map, not a property of the territory. The territory probably doesn't have anything that could reasonably be called time, along the lines of the timeless physics posts.
mfb40

Let's see.

  • No superluminal neutrinos (85%) -> true
  • OPERA measurement error (50%) -> true
  • Higgs boson with local (90%) and global (85%) 5sigma significance (updated to 70% below) -> true
  • No other new particle (75%) -> true
  • Proton-lead-collisions (75%): This is an interesting prediction. The collisions took place, but in september. and LHC plans to collide more in february. As I posted my prediction, such a deviation from the plan was somewhere at "other things I don't even think about", therefore I did not care about a precise definit
... (read more)
mfb80

You should be careful with addition and multiplication - to use them, you would have to define them first, and this is not trivial if you have the natural numbers plus A->B->C->A, infinite chains and so on.

In addition, "group" has a specific mathematical meaning, if you use it for arbitrary sets this is quite confusing.

1[anonymous]
You don't have to define addition and multiplication -- you can just make them be a part of your language. In fact, in first order theories of arithmetic, you have to do so because you cannot define addition and multiplication from successor in first order logic. In other words, the difficulty is with the language not with whether you happen to be using a standard or a non-standard model. This is a general rule in model theory (and for that matter everywhere else): what you can express has to do with the language not the subject.
mfb50

It would be very interesting to see cryonics for very simple brains of other species. This could determine or narrow down the range of probability for several factors.

Edit: Removed doubled word

mfb10

I also wonder if some failures of human rationality could be counted as a weak form of wireheading. Self-serving biases, confirmation bias and rationalization in response to cognitive dissonance all create counterfeit utility by generating perceptual distortions.

I think those are good examples how human brains build (weak) delusion boxes. They are strong enough to increase happiness (which might improve the overall performance of the brain?), but weak enough to allow the human to achieve survival and reproduction in a more or less rational way.

mfb80

The DM could let the elves attack during plowing. Should be a strong incentive to get into a fight.

mfb00

I don't think this will die soon, similar to many other obscure types of "medicine". Proper medical treatments can fail, and in that case many are looking for alternatives. Add some "$person was treated with §method and $symptom went away!"-"confirmations", and you have a market for that.

5CCC
-- Sir Peter Medawar, "The Art of the Soluble"
mfb00

Bit modifications are part of the process of computation. I wouldn't say they are "affected by" that (they depend causally on the input which started the process of computation, however). In a similar way, individual humans are not affected by the concept of "mankind" for all of them.

mfb80

I think the question "does consciousness affect neurons?" is as meaningful as "does the process of computation in a computer affect bits?".

7Eliezer Yudkowsky
In other words, "Yes"?
mfb10

The Standard Model of particle physics with MWI is time-symmetric (to be precise: CPT symmetric) and conserves information. If you define the precise state at one point in time, you can calculate the unique past which lead to that state and the unique future which will evolve from that state. Note that for general states, "past" and "future" are arbitrary definitions.

4CronoDAS
(Which is why I specified a different set of laws of physics.)
mfb00

Papers I read are mainly physics papers, especially particle physics. Not replicated results there are so rare that they often get significant attention in the community (Blog article) or even mainstream media (OPERA neutrino speed measurement).

The usual study&publication process for a new particle detector looks like that:

  • identify particles flying through the detector (known for >50 years)
  • find the decays of frequent short-living particles (known for >30 years), use them as calibration
  • look for other known particles and compare their mas
... (read more)
mfb00

If something applies to white horses only, I would write "white horses" instead of "horses". Otherwise it might suggest (at least to some readers) that it applies to many, most or even all horses. It is not wrong, but it can be misleading.

0gwern
I'm not sure it is misleading; the material is obviously focused on health and psychology as the areas I read most in, but the the results I discuss should apply to many areas: the specific problems of no incentives for replication or less than p<0.05 significance are common to all areas or all areas which use NHST statistics, etc. You may like to think that hard sciences like chemistry are exempt... but I get a lot of these citations off a biochemistry blog!
mfb00

Why do you write "Flaws in mainstream science", if you mean specific parts of science only?

Some other mainstream areas have replication rates of more than 95%.

2gwern
A specific part of science is part of mainstream science - or is a white horse not a horse?
mfb00

Interesting article, thanks.

I agree with the general concept. I would be a bit more careful in the conclusions, however:
No visible correlation does not mean no causation - it is just a strong hint. In the specific example, the hint comes from a single parameter - the lack of significant correlation between internet & overweight when both exercise categories are added; together with the significant correlation of internet usage with the other two parameters.

With the proposed diagram, I get:
p(Internet)=.141
p(not Internet)=.859
p(Overweight)=.209
p(not Over... (read more)

mfb00

I can still make 100000 lottery predictions, and get a good score. I look for a system which you cannot trick in that way. Ok, for each prediction, you can subtract the average score from your score. That should work. Assuming that all other predictions are rational, too, you get an expectation of 0 difference in the lottery predictions.

I've only been making the forecast well-specified

I think "impact here (10% confidence), no impact at that place (90% confidence)" is quite specific. It is a binary event.

mfb00

To calculate the Brier score, you used >your< assumption that meteorites have a 1 in a million chance to hit a specfic area. What about events without a natural way to get those assumptions?

Let's use another example:

Assume that I predict that neither Obama nor Romney will be elected with 95% confidence. If that prediction becomes true, it is amazing and indicates a high predictive power (especially if I make multiple similar predictions and most of them become true).

Assume that I predict that either Obama or Romney will be elected with 95% confidence... (read more)

0Kindly
If the objective is to get better scores than others, then that helps, though it's not clear to me that it does so in any consistent way (in particular, the strategy to maximize your score and the strategy to get the best score with the highest probability may well be different, and one of them might involve mis-reporting your own degree of belief).
0Morendil
You're getting this from the "refinement" part of the calibration/refinement decomposition of the Brier score. Over time, your score will end up much higher than others' if you have better refinement (e.g. from "inside information", or from a superior methodology), even if everyone is identically (perfectly) calibrated. This is the difference between a weather forecast derived from looking at a climate model, e.g. I assign 68% probability to the proposition that the temperature today in your city is within one standard deviation of its average October temperature, and one derived from looking out the window. ETA: what you say about my using an assumption is not correct - I've only been making the forecast well-specified, such that the way you said you allocated your probability mass would give us a proper loss function, and simplifying the calculation by using a uniform distribution for the rest of your 90%. You can compute the loss function for any allocation of probability among outcomes that you care to name - the math might become more complicated, is all. I'm not making any assumptions as to the probability distribution of the actual events. The math doesn't, either. It's quite general.
mfb10

Interesting, thanks, but not exactly what I looked for. As an example, take a simplified lottery: 1 number is drawn out of 10. I can predict "number X will have a probability of 10%" 100 times in a row - this is correct, and will give a good score in all scoring rules. However, those predictions are not interesting.

If I make 100 predictions "a meteorite will hit position X tomorrow (10% confidence)" and 10% of them are correct, those predictions are very interesting - you would expect that I have some additional knowledge (for example, ... (read more)

0Morendil
Help me understand what you're describing? Below is a stab at working out the math (I'm horrible at math, I have to laboriously work things out with a bc-like program, but I'm more confident in my grasp of the concepts). The salient feature of your meteorite predictions is location. We can score these forecasts exactly as GJP scores multiple-choice forecasts, as long as they're well-specified. Let's refine "hit position X" to "within 10 miles of X". That translates to roughly a one in a million chance of calling the location correctly (surface area of the Earth divided by a 10-mile radius area is about 10 to the 6). We can make a similar calculation with respect to the probability that a meteorite hits at all; it comes out to roughly one per day on average, so we can simplify and assume exactly one hits every day. So a forecast that "a meteorite will hit location X tomorrow at 10% confidence" is equivalent to dividing Earth into one million cells, each cell being one possible outcome in a multiple-outcome forecast, and putting 10% probability mass into one cell. Let's say you distribute the remaining probability evenly among the 999,999 remaining cells. We can now compute your Brier loss function, the sum of squared errors. Either the meteorite hits X, and your score is .81 (the penalty for predicting an event at 10% confidence that turns out to happen), plus epsilon times one million minus one for the other cells. Or the meteorite hits a different cell, and your Brier score is 1.01 minus epsilon: 1 minus epsilon for hitting a cell that you had predicted would be hit at a probability close to 0, plus .01 for failing to hit X, plus epsilon for failing to hit the other cells. So, over 100 such events, the expected value of your score ranges from 81 if you have laser-like accuracy, to 101 if you're just guessing at random. Intermediate values reflect intermediate accuracies. The range of scores is fairly narrow, because your probability mass isn't very concentrated
mfb30

brazil84 stated that there are just two options, so let's stick to that example first.

"[rifle] no bullet will be find in or around the person's body 0.01% of the time" is contradictory evidence against the rifle (and for the handgun). But "[handgun] no bullet will be find in or around the person's body 0.001% of the time" is even stronger evidence against the handgun (and for the rifle). In total, we have some evidence for the rifle.

Now let's add a .001%-probability that it was not a gunshot wound - in this case, the probability to find... (read more)

mfb00

If either X or Y has to be true, you cannot have 20% for X and 35% for Y. The remaining 45% would be a contradiction (Neither X nor Y, but "X or Y"). While you can work with those numbers (20 and 35), they are not probabilities any more - they are relative probabilities.

It is very unlikely that the murderer won in the lottery. However, if a suspect did win in the lottery, this does not reduce the probability that he is guilty - he has the same (low) probability as all others.

2bigjeff5
I'm talking about probability estimates. The actual probability of what happened is 1, because it is what happened. However, we don't know what happened, that's why we make a probability estimate in the first place! Forcing yourself to commit to only one of two possibilities in the real world (which is what all of these analogies are supposed to tie back to), when there are a lot of initially low probability possibilities that are initially ignored (and rightly so), seems incredibly foolish. Also, your analogy doesn't fit brazil84's murder example. What evidence does the lottery win give that allows us to adjust our probability estimate for how the gun was fired? I'm not sure where you're going with that, at all. The real probability of however the bullet was fired is 100%. All we've been talking about are our probability estimates based on the limited evidence we have. They are necessarily incomplete. If new evidence makes both of our hypotheses less likely, then it's probably smart to check and see if a third hypotheses is now feasible, where it wasn't before.
mfb00

That reminds me of a question about judging predictions: Is there any established method to say "x made n predictions, was underconfident / calibrated properly / overconfident and the quality of the predictions was z"? Assuming the predictions are given as "x will happen (y% confidence)".

It is easy to make 1000 unbiased predictions about lottery drawings, but this does not mean you are good in making predictions.

0Morendil
Yes: use a scoring rule to rate your predictions, giving you an overall evaluation of their quality. If you use, say, the Brier score, that admits decompositions into separate components, for instance "calibration" and "refinement"; if your "refinement" score was high on the lottery drawings, meaning that you'd assigned higher probabilities of winning to the people who did in fact win (as opposed to correctly calling the probabilities of winning overall), you'd be a suspect for game-rigging or psi powers. ;)
mfb20

Sorry, I was a bit unprecise. "You need texts without size limit" would be correct. The issue is: Your memory (and probably lifetime) is finite. Even if you convert the whole observable universe to your extended memory.

mfb20

To get an infinite set of texts with a finite set of characters, you need texts of infinite length. I think it is similar for dreams - the set of possible experiences is finite, and dreams have a finite sequence of experiences.

The pool of possible dreams is so large that we will never hit any limit - and even if (which would require experienced lifetimes of 10^whatever years), we would have forgotten earlier dreams long ago.

3AlanCrowe
You get an infinite set of texts with a finite set of characters and texts of finite length merely by letting the lengths be unbounded. Proof: Consider the set of characters {a}, which has but a single character. We are restricted to the following texts: a, aa, aaa, aaaa, aaaaa,... We nevertheless spot an obvious bijection to the positive integers. (Just count the 'a's) So there are infinitely many texts.
mfb10

Daydreaming? I think we should not take "dream" to literal here.

"Infinite" is problematic, indeed. I think there is just a finite number of dreams of finite length.

1scav
I think it's OK to take "dreams" literally when contrasted in the same sentence with "waking". I'll give the writer the benefit of the doubt along one axis: either they were expressing insightless nonsense clearly, or they are not great at communicating their brilliant insights ;)
3Aurora
Take "infinite" as you would take the recursiveness of language, there is a set of finite words or particles from which you can just "create" infinite combinations. About the numer of dreams, do you reckon there is something like a pool of dreams we use one by one until it's empty?
0DaFranker
Indeed, it seems difficult to dream of the Kloopezur, infinite meta-minds whose n-dimensional point-thoughts are individual configuration frames in spacetime arrangements of relative velocities of all particles in our current universe, who have long solved the meta-problem of solving infinite problems with finite resources. It seems particularly difficult to dream about the infinite lives of an infinity of Kloopezur.
mfb00

I did not call anything "true moral dilemma".

Most dilemmas are situations where similar-looking moral guidelines lead to different decisions, or situations where common moral rules are inconsistent or not well-defined. In those cases, it is hard to decide whether the moral system prefers one action or the other, or does not care.

mfb20

The tricky task is to distinguish between those 3 cases - and to find general rules which can do this in every situation in a unique way, and represent your concept of morality at the same time.

If you can do this, publish it.

1Kindly
Well, yes, finding a simple description of morality is hard. But you seem to be asking if there's a possibility that it's in principle impossible to distinguish between these 3 cases for some situation -- and this is what you call a "true moral dilemma" -- and I don't see how the idea of that is coherent.
mfb10

I think this would be even more interesting as "pick at random, without an external source of randomness". Sure you can get random numbers from random.org, your computer or the seconds on your watch (a nice idee), but those just blur the effect of mind-generated random numbers.

mfb00

I agree with that interpretation. The 13636 murders contain:
1676 from strangers 5974 with some relation
*5986 unknown

Based on the known cases only, I get 22% strangers. More than expected, but it might depend on the region, too (US <--> Europe). Based on that table, we can do even better: We can exclude reasons which are known to be unrelated to the specific case, and persons/relations which are known to be innocent (or non-existent). A bit tricky, as the table is "relation murderer -> victim" and not the other direction, but it should be possible.

mfb00

Interesting posts.

However, I disagree with your prior by a significant amount. The probability that [person in group] commits a murder within one year is small, but so is the probability that [person in group] is in contact with a victim. I would begin with the event [murder has happened], assign a high probability (like ~90%) to "the murderer knew the victim", and then distribute those 90% among people who knew her (and work with ratios afterwards). I am not familiar enough with the case to do that know, but Amanda would probably get something around 10%, before any evidence or (missing) motive is taken into account.

0shokwave
A cursory search suggests 54% is more accurate. source, seventh bullet point. Also links to a table that could give better priors.
mfb00

That would just cause them to pump chemicals in you head, I think. But it's definitely thinking in the right direction.

As long as I am not aware of that (or do not dislike it)... well, why not. However, MugaSofer is right, the genie has to understand the (future) utility function for that. But if it can alter the future without restrictions, it can change the utility function itself (maybe even to an unbounded one... :D)

mfb-20

Immortal humans can go horribly wrong, unless "number of dying humans" is really what you want to minimize.

"Increase my utility as much as you can"?

0MugaSofer
I said: You replied: I am well aware that this wish has major risks as worded. I was responding to the claim that "you can't use that tool to solve that problem." Yes, obviously you wish for maximised utility. But that requires the genie to understand your utility.
0chaosmosis
That would just cause them to pump chemicals in you head, I think. But it's definitely thinking in the right direction. Even with pseudo immortality, accidents happen, which means that the best way to minimize the number of dying humans is either to sterilize the entire species or to kill everyone. The goal shouldn't be to minimize death but to maximize life. That actually seems like it'd work.
mfb40

Well, it is a necessary step to find other fruits.

mfb30

All the world's major religions, with their emphasis on love, compassion, patience, tolerance, and forgiveness can and do promote inner values. But the reality of the world today is that grounding ethics in religion is no longer adequate. This is why I am increasingly convinced that the time has come to find a way of thinking about spirituality and ethics beyond religion altogether.

Tenzin Gyatso, 14. Dalai Lama

7NancyLebovitz
That's intriguing, but it also sounds like a case of non-apples.
mfb10

I underestimated how bad survey questions can be.
"Do you completely agree / mostly agree / mostly disagree / completely disagree with: Miracles still occur as in ancient times" (I shortened the first part a bit, without changing the context)
Seriously, wtf? The question assumes that miracles occured in ancient times. It does not define what "miracle" means at all, and it does not ask if miracles occur at all, it asks for a trend. 79% of the answers were counted as "belief in", I think that those were the first two groups only (... (read more)

0thomblake
The mormons would tell you, for the most part, yes. And they generally believe in heaven and not hell. Indeed, I might have given a "completely agree" there given that miracles occurred none of the time in ancient times, and are still going strong at that rate. But maybe other respondents have less trouble with loaded questions. Or those 3% believe in heaven but don't believe that dead people get to go there. It might just mean "God's house", or be reserved for those who are raptured.
4ArisKatsaris
That's one option. Another option would be that bad people just cease to exist. Or they get reincarnated until they become non-bad enough for heaven.
mfb00

I meant "careful with respect to 'admitting that religious claims can be wrong' " - in other words, the same as you.

mfb90

Wikiquote (http://en.wikiquote.org/wiki/Tenzin_Gyatso,_14th_Dalai_Lama) quotes this as

My confidence in venturing into science lies in my basic belief that as in science so in Buddhism, understanding the nature of reality is pursued by means of critical investigation: if scientific analysis were conclusively to demonstrate certain claims in Buddhism to be false, then we must accept the findings of science and abandon those claims.

I like that. It is a bit careful, but better than everything else I saw from other religions.

8Shmi
Fortunately for him, Buddhism is cleverly designed to contain no scientifically falsifiable claims. Well, maybe some of the 14 (really only 4) unanswerable questions can be answered some day. Cosmologists might prove that the universe is finite (current odds are slim), AI researchers might prove that self is both identical with the body and different from it by doing a successful upload. Would it make Buddhists abandon their faith? Not a chance.
3Larks
Christians have given up virtually all of the bible on the basis of science. Whether or not they are still christians is another issue.
7Desrtopa
I'd say "careful" would be the other way around, not believing doctrines that make complex claims about reality until he has good evidence that those beliefs are true. Giving up hard-to-test beliefs only in the extreme case where scientific research conclusively proves them wrong is just a small concession in the direction of being epistemically responsible.
mfb10

Most human utility functions give their own happiness more weight than other's. If you take into account that humans increase the happiness of others because it makes themself happy, you could even say that human utility functions only care about the happiness of their corresponding humans - but that is close to a tautology ("the utility function cares about the utility of the agent only").

mfb20

Lightning strikes usually do not involve physical impacts - I think "falling from 3-10 meters and getting struck by lightning" would be worse. In addition, the length of the current flow depends on the high voltage system.

4wedrifid
This seems overwhelmingly likely.
mfb-40

In this case: Where is the issue? If the ship survived 10 jumps, it is probably safe to make another one - the same decision could be done on earth, which exists in both relevant cases.

With sufficient intelligence, the robot could calculate a probability of 1-eps that there are robots from earth, even if earth could have developed without a robot-building species. The robot can use its own existence to update probabilities in both cases.

mfb00

I think life requires a system large and complex enough to produce decoherence between "alive" and "dead" in timescales shorter than required to define "alive" at all.

0Decius
Sorry, that was a Schrodinger's Cat joke.
mfb-30

At least not in worlds where he is alive.

1Decius
Is it worse to enter a state of superimposed death and life than to die?
mfb00

If you can scan it, maybe you can simulate it? And if you can simulate one, wait some years and you can simulate 1000, probably connected in some way to form a single "thinking system".

1Eugine_Nier
But not on your own brain.
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