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Since Wednesday lat evening, I am back happy and still a bit tired from the 5th Offtopicarium in Wegierska Gorka, Poland. As the Offtopicarium is organized by science nerds for nerds ;-), it was a lot of fun to be together with the very nice small (about 30 people) group of young people. The program was rather interdisciplinary, ranging from biology, history, constructed languages, space projects of students, science communication and education, and many more things. I hope all talks will be accessible soon from the official homepage. In particular the talk about Opening Science could be worthwhile to consider in some detail, as there is some overlap to what we want to achieve by the Reviews section. Getting to Wegierska Gorka from Bad Doberan (Germany) was a bit cumbersome and time-consuming. From Katowice I still had to take another train for 2 hours. Considering different means of public transportation, proper time of the trip can not be reduced to less than 14h+ which is therefore the global minimum. Therefore I was not able to arrive before Saturday afternoon. The meeting had begun on Thursday already and missed therefore about the first half of the talks. All talks have been very good and impressive generally, here you can see for example Piotr Migdal giving a talk about how often the best and most innovative things are done by people with greatest passion and motivation in their free time, even though (or because) they do not get paid for it. As PhysicsOverflow for example … 😉 My talk about PhysicsOverflow Happily, my talk about PhysicsOverflow was soon enough ready as you can see below. And surprisingly I realised that I did not even have to take notes about what I’m going to say (as for other talks related to my work) but I could just go on blathering without effort … ! When bragging about PhysicsOverflow, I am obviously unstoppable 😛 Unfortunately, my laptop refused to connect to the WLAN in the meeting room, so I could not show a live demonstration :-/. You can find the slides of my talk here (the quality was better in PPT than it now is in PDF) 🙂 In the introduction, I first explained why a new higher-level physics site was urgently needed, how PhysicsOverflow is organised in different parts such as Reviews, Q&A, Meta, etc as well as our most important principles and characteristics. On the next slides, I introduced the Q&A part as a physics analog of MathOverflow and explained the most basic things about how it works, scope, etc … To introduce the Reviews section I ranted a bit about how present journal peer-reviewing sucks ;-), then explained how paper reviewing is done on PhysicsOverflow, and showed two examples of a negatively and a positively reviewed paper. I also got a very good discussion to my talk (nicely supported by Piotr Migdal) , the following issues have been discussed (not in exactly the order listed here):
- Why did we have to creat something new instead of using something that already exists, such as for example the SE platform?
To answer this, I had prepared in advance a slide (22) that summarises a bit why the goals of the SE company IMO clash with the intentions of a high-level academic community. Somebody mentioned that there are academic sites in the network too which is true but works only for exceptional cases (I only know MO and CST) … Piotr helped by explaining that very high-level questions are not really high-lighted on SE for example. Also, conversely to the time when MathOverflow was created almost exactly 5 years ago (congratulations!) , SE does no longer give away its software today. There have also been
- Some discussion about partitioning the site instead of supporting other communities in starting their own site (for example PhysicsUnderflow) to build an Overflow network
This is in principle doable as we have categories in addition to tags, as for example explained on slide 20 about the differences between the PO and SE software.
- Of course, I also called for a second developer
which resulted in the suggestion to upload the code on Github for other people to help us with the development and debugging, but as Polarkernel said we are not yet ready to do this … There have also been some
- Questions about how many people we have, how many papers are submitted, etc :
About 250 newly registered, not all are active at the same time of course … The Reviews section (Reviews I) went online later than the Q&A section, so it is natural for it to have less content (48 papers at present) than the Q&A section. Another questions was about
- What could endanger the success of the site?
Here I said that at the beginning, I and probably others were too enthusiastic about the Reviews section finally getting started, so we were too permissive about accepting submissions. But this is fixed now by our “reject to review policy”. There was also
- Some discussions about the formula to calculate the final score of submissions:
Strong nonlinearity, the effect of additional points for one unit accuracy and originality depends in not plain obvious way on the votes the paper already has… As the accuracy determines the sign of the final score, crackpots who make unfounded “revolutionary” claims are punished which is a good feature. Does this formula really what we want to achieve in all cases? Final remarks The meeting was really fun, and there have been many cool nice people :-). I am very happy about the positive response I got to my introduction of PhysicsOverflow and will also reconsider some of the other great talks I have seen. And I really liked it to meet Piotr Migdal in person 🙂 BTW he has now submitted his PhD thesis, congratulations ! Only the mud (literally!) sucked on our trip to the mountains because it was rainy the days before … 😀 Joking … The trip was fun too 🙂
Today, the new category system, which allows an unrestricted number of category-levels, has been installed on PhysicsOverflow. This system was required to enable the categorization of submissions beyond the four levels provided by the actual Question2Answer (Q2A) framework. This new system is almost invisible for the user, but has the important function to make a (future) large number of submissions searchable by the user. About two and a half months have been required to develop this system, you had to wait for a long time. Therefore I like to give you some insights.
The original category system of the Q2A framework is a hierarchical database model. Every node (a category) is linked to its parent by the ID of the parent node. Such a model enables a fast writing of new nodes (you just create the node and link it to its parent), while queries through the tree are usually slow. Q2A solved this issue by a fixed number of 4 category levels. To be able to find parents in a short time, the path to the parent is hard-coded in every post. This means that every post contains four indices storing the way back through the tree. This is a clever and fast solution. However, it can not be extended to an unrestricted number of categories, it even gets slow if extended to 8 levels for instance. The category system is written in the core code of Q2A and spread over a large part of the system.
Another issue arising when we increase the number of category levels is the user interface. Actually, when the user asks a question, he has to select the category for this post. The user interface uses select tags like:
It is clear that for instance for eight categories, the place on the page is too small to display all these tags side by side. Therefore also the user interface had to be changed. The new user interface take much less room and looks like this:
For the new category system, I have implemented another database model, called nested set model. It allows for an unrestricted number of category levels. While queries through the categories become very fast, the insertion of nodes is slow, because all indices of the whole tree have to be changed. However, changes on the categories will be used much less frequent than for instance to display the tree. Like this, it is well adapted to our needs.
As already mentioned, the original category system is placed in the core code of Q2A and is active in almost all pages provided by the framework (even in pages I never expected this). I had to replace 9 files completely, all select specifications for database accesses to the category system had to be renewed and, naturally, the code for the nested set model had to be written. To give you an impression on the size of the task, here some numbers: The original Question2Answer framework consists of about 36’000 lines of code. Until today, I have written 18’100 new lines of code for PhysicsOverflow in form of plugins, layers, overrides and changes in the core code, about half of the size of the system. The new system required 5’800 additional lines of code, which explains, why it took that long to realize it. I hope now that I was able to test all use-cases so that there remain eventually only minor bugs.
The next development step will be a surprise, stay tuned!
A few weeks ago, Piotr Migdal made me aware of the Offtopicarium (he is among the organizers), which is a mixture of scientific conference, workshop, and geek gathering ;-). Its purpose is to discuss topics and ideas, which are usually off-topic to “regular” events and meetings, but nevertheless interesting and exciting. The Offtopicarium welcomes (rather geeky 😉 …) people, who have a good idea and are passionate about it, such as scientists, entrepreneurs, people involved in startups, NGOs, and such.
So, after nice discussions and kind encouragement by Piotr Migdal, I finally submitted an abstract. It got just accepted, such that we will have a (20 min + 20 min discussion) talk about PhysicsOverflow at the
(Click the title for more information!)
Of course, I will shamelessly use this opportunity to introduce and advertise PhysicsOverflow:
The Q&A part as a revival of Theoretical Physics SE and a physics analogue of MathOverflow, whereas the Reviews section should take the role of an overdue competitor of the (outdated and flawed in many ways) journal peer-reviewing process.
And who knows, maybe we will also find a second system developer there, to help and unburden Polarkernel …?
Anyway, summer holidays are mostly over (at least in Germany …) and members of PhysicsOverflow are heartily encouraged to make PhysicsOverflow look as awesome as possible by nice contributions 😉 !
Even though I already have some ideas of course ;-), I would be happy to consider suggestions concerning the talk, they can be mentioned for example in the comments here.
PhysicsOverflow public beta is online now since 17 days. After a turbulent start with some database issues on our host and spam attacks, now the site is stable and working fine. After an ongoing and continuous improvement of details, the section with Q&A on physics takes now the main part of activity on the site. Since we have gone online at 4th April, more than 150 new users have registered on the site and many of them are already quite active. The number of visits per day exceeded the number of visits on Theoretic Physics on SE since the first day, as can be seen in the following graphics:
This is great, since we aren’t even part of a huge network! Our questions per day is about 5.6 (excluding imported posts), which is a lot more than TP.SEs. However, as already stated, the site does not depend on these figures, there is no deadline, as it was on TP. Also the term beta does not mean that the site will go away, it means only that we have still much more ideas to obtain the full-fledged version of PhysicsOverflow.
Now is the time where the site gets shaped. If you participate now with your votes, ideas, opinions, questions and answers, you contribute to build a site with contours as you like them. Don’t stay outside, have a look at PhysicsOverflow, register there if you like it, or contribute here on this blog.
We are still a small team. However, we are working with full power to be able to leave the beta state and to complete the site, as intended. The main part for this will be the Review Section, as already announced in this blog. This is not only a reconfiguration of the site, it requires a considerable part of new development, because such a feature is not foreseen in the Question2Answer framework. In detail, the following main functionalities have to be developed:
- Integration of new pages, called Submission and Review.
- Two voting criterias, one for originality and one for accuracy.
- New page design, enabling display of a score value from the votings.
- Add feature to add multiple authors.
- Redesign of voting mechanism, distributing votes to multiple authors.
- Integration in the rep update and recount system.
- Adding and managing the required database tables.
- Increasing the category depth to realize hierarchical tagging system.
- Integration of score as new sorting criterion.
- Software for mass import from ArXiV.
- Software for daily import from ArXiV.
We are on the way with all that and look forward to realize these steps within a reasonable time. Stay tuned!
I realised a forgot an important setting in my previous post .
At the end of the Users settings page, one may define the fields found on the user profile. On Stack Exchange, one has about, website, location, age, and real name.
I have little to say about this. Does anyone have any ideas about what we may need additionally? Probably two websites could be allotted, like “personal website”, “professional website”. What about a place where one could list the other projects (other Q&A sites, etc.) to which they contribute to? Is “location” vague (is it better to have one “location”, and one “from”?)? Should we get rid of anything (location?).
Note that one may add additional fields, decide it’s type (URL? Single line of text ? , or entire essay like for About?), change it’s visibility (make Full name visible to everyone, unlike on SE? or is that a bad idea?), and it’s positions.