Confessions of a researchaholic

2010-08-07

Life as loan

Filed under: Imaginary — liyiwei @ 10:56 am
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Recently I read about an interesting point, in the context of usury and debt interest payments under the Catholic and Sharia laws, that life is a loan from God and thus (just like all loans) will have to be repaid one day.

I am not religious but I have found this an interesting mental exercise: if life is indeed a loan and one day we have to pay it back (to God) with principle plus interests, what the latter would be? In other words, what kinds of values do we have to add to our lives (for the sake of interest payments)? For simplicity, let us assume life is like a zero-coupon bond and everything is paid back in the end (of the life).

Social pass

Filed under: Real — liyiwei @ 10:15 am
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It will be great if SIGGRAPH (and other conferences) could have a new registration category called “social pass”. This social pass will be (significantly) cheaper than full registration, and is designed primarily for people who go to conferences mainly to socialize with colleagues. When I was in grad school I used to listen attentively to all the technical sessions, but nowadays (for better or worse) I found myself spending so much time chatting with people to the point that I serious doubt the value I paid for a full registration. I still go to many technical sessions, but my main purpose now turn to meet specific people (e.g. paper authors or people who work on related fields) and pay enough attention to the presentations so that I could have enough information to chat up with the authors later on. (Man, I like your presentation, especially demo XXX. What a cool paper!)

On a further thought, I could be tricky to design such a social pass. If I just want to talk to people in the hallways, I actually do not have to pay a dime and just need to walk into the convention center. But then that might not be enough, as a lot of the conversations happen inside the sessions (especially at the beginnings and ends) and the parties (most of which, hosted by various companies and research groups, I could already go for free). So I still need the credential to attend a certain subset of full registration.

Maybe one possibility is to charge for individual sessions so that I could pick only these that I plan to attend (to socialize). For the rest, I could simply loiter in the hallways and the parties.

2010-08-02

Example-based texture synthesis in production scenario

Filed under: Real — liyiwei @ 11:36 am
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So it turns out that example-based texture synthesis has been deployed in Disney’s Tangled; for more details, see here (author’s site) and here (ACM DL).

So now people can no longer claim example-based texture synthesis is useless. ;-D

Anyone knows any other production scenarios please let me know.

2010-08-01

Academic fraud in China

Filed under: Real — liyiwei @ 9:59 am
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Anyone still questioning my emphasis and insistence on academic integrity (e.g. be honest in disclosing limitations and do not abuse authorship) please just take a look at this Economist article.

“In looking for people to hire, you look for three qualities: integrity, intelligence, and energy. And if they don’t have the first, the other two will kill you.” – Warren Buffet

2010-06-10

About work and motivation

Filed under: Real — liyiwei @ 3:55 pm
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Axiom: I only work for myself.

Theorem 1: If I ever want to work for a company, I try to find one that happens to want me to do what I want to work for myself. Thus, I get paid for working for myself, and no manager ever needs to bother to monitor or push me. Everybody is happy.

Theorem 2: I only collaborate with people who want to work on things that I want to work on. Thus, I never have to push or monitor them. A good example is a bunch of students who also want to do SIGGRAPH and who would work with me for free and who also would work their ass off (to the point that I have to mandate a curfew that everybody go home and sleep no later than 2 AM everyday).

Theorem 3: If an unfortunate temporary situation arises that the company wants me to work on something that I am not interested in, then I try to package my stuff so that I can continue to work on what I want but also make it appear to be something the company wants. However if the situation persists, go to Theorem 1.

2010-06-07

Crouching tiger, hidden dragon

Filed under: Real — liyiwei @ 4:50 pm
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There is this guy who I regularly bumped into around my office building as well as the nearby bus stop.

From the way he talked and walked it appears that he has suffered from some kind of strokes and/or autism/Asperger syndromes. I regularly saw him during holidays and weekends in our office building. Often, he just sat in the corner of a conference room table without seeming to be doing anything else. I can also detect certain stale smells on him through my somehow sensitive olfactory system (a main reason that I do not eat meat). All in all, he appears to be a strange guy, even in my standard.

But my experience also told me that a seeming eccentric guy in MSR is probably famous or important or both, so the day before I chatted with him while waiting for the bus together, got his name, and looked it up online. Well, he is obviously famous enough to have a Wikipedia page, and according to that he has made fundamental theoretical contributions to cryptography. He also has an Erdos number of 1 and received several major awards.

I wonder if I will be (or already am) considered eccentric by other people around me. But honestly I do not think I care. I plan to chat with that guy more next time I bump into him.

2010-04-12

Accidental art

Filed under: Imaginary,Real — liyiwei @ 2:55 pm
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For some reason, the most beautiful images I have produced tend to be the buggy ones.

I guess this is a unique advantage of graphics research (compared to other CS fields): when we screw up, we might be able to claim the result as an art.

2010-04-06

How to deal with rejections

Filed under: Real — liyiwei @ 2:08 pm
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(If you are doing graphics research, you probably know that this is about the time every year for people to feel frustrated about rejections. So allow me to share my personal thoughts on this in the hope to make this world better.)

Theorem: life is a stochastic sampling process

Corollary 1: keep on trying

The whole paper submission and reviewing process is also stochastic. Out of the whole world of about 6 to 7 billion people, only 5 review your paper, and they, along with about 50 other committee members, decide the fate of your paper. For these papers that are either very good or very bad, the outcome would probably be the same regardless of who are the reviewers. However, since most papers are in the borderline gray area, they can easily end up in very different outcomes depending on who review your papers.

So, in a sense, getting upset about paper rejections is about as useful as getting upset at slot machines in a casino.

Now, assuming the review process is reasonably independent and unbiased (issues mostly beyond your control anyway), then the best way for variance reduction is to generate more samples. So, if you are tough and persistent enough and keep on submitting, in the long run your aggregate acceptance rate should approach your “intrinsic” value. In my personal case, I have huge yearly variations on acceptance rates, but my life time acceptance rate (so far) for SIGGRAPH is about 1/3, which I heard is about right for a reasonably good graphics researcher.

Corollary 2: do what you love

I hope it is not too late, but it is very important that you do what you absolutely love (instead of for any other reasons). This will give you more buffers to live through rejections. For me, I will not regret doing research even assuming all my future submissions are rejected.

Corollary 3: look for good things at other peoples papers (and look for bad things at yours)

I have seen multiple occasions where someone with rejected papers looked at the accepted ones and said: “These papers are not better than mine! How come they got accepted while mine got rejected?”

First of all, according to Corollary 1, this might actually be true due to the stochastic nature of the review process.

However, this might be (and likely is) untrue as well. It is human nature to evaluate their own work more highly than that of the others, so such a comparison is inherently biased.

More importantly, I do not see how that will help. Very few papers are perfect, so if one is accepted, it might as well have some merits, despite its apparent flaws. If you keep on looking for bad things instead of good things of the accepted papers, you will never learn why they are accepted, and thus keep on getting yours rejected.

So, I always try my best to look for good things in others papers. This not only motivates me to learn new things but also keeps me positive.
And when I look at my own papers, I always try my best to look for flaws and defects. Obviously, it is much better for me to spot and fix these before the reviewers have a chance to do so.

Corollary 4: quit whining

According to http://www.100people.org/, among the world population, 50% live in poverty, 1% have a college education, and 1% own computers. So if you could manage to get papers rejected, you are in the lucky 1% minority. That is, you are 99% likely to have ended up in a situation where you will be worrying about other stuff rather than paper rejections. So quit whining.

2010-03-05

Publishing reviews

Filed under: Real — liyiwei @ 5:43 pm
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This is one of the mysteries that I have yet to figure out. Obviously, publishing is very important, and reviewing is the main factor deciding whether a submitted paper will be published. But somehow the reviewers receive almost no credit (except for token ones like conference mugs or listed names on the proceedings).

As a result, it should not be a surprise that many people spend much less efforts in reviewing than in publishing. And it is hard for me to imagine this asymmetry in efforts would not cause any problems, or least would not prevent the peer review systems from being better or more effective.

A simple solution is to publish good reviews, *under the reviewers consensus*, for both positive and negative opinions towards the relevant papers. The reviews could appear alongside the published papers in the proceedings, or at least in the digital library.

I could see several advantages of such an approach. First of all, it would make the recognition between papers and reviews more symmetric, and thus gives the reviewers more incentives to do a good job. Since the reviewers could opt for not having the reviews published, there should be no concern about integrity of the review process. The reviews could also provide more useful information for the papers, in the form of digests or opinions. Since reviewers are often among those who read the papers most carefully and thoroughly, their comments could provide additional angles for the relevant papers, which by nature reflect the authors (mostly) one sided opinions. This also makes the review process more transparent, producing a better sense of fairness and letting out some hints on why the papers are accepted.

Of course, reviews for rejected papers would not be published, but the symmetry between publishing/reviewing remains so I do not see any major problems here. One side effect would be that people might steer away from reviewing apparently bad papers even more so than they would now. But I would say that if the committee finds it hard to recruit reviewers for a particular submission, it might as well be a good reason to reject the paper outright; if a paper cannot even attract reviewers, how likely is that it would attract readers once published?

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