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    Logic and Computation Intertwined Computer Science

    July 01, 2020

    Logic and Computation Intertwined Computer Science

    Logic and Computation Intertwined

    Posted: 30 Jun 2020 02:27 PM PDT

    [Project] Measuring a listener's tolerance to the quality of audio files

    Posted: 30 Jun 2020 04:52 AM PDT

    I am working with LiveSensus, a team comprised of 5 Computer Science and Computer Engineering students at the University of Illinois at Urbana-Champaign. LiveSensus is working on a project that measures a listener's tolerance to different audio issues that may come up during live streams, video conferencing call, and online lectures.

    LiveSensus has created a machine learning program where users can rate audio clips based on their perception of the quality. At this point, the website is launched and we are seeking respondents interested in testing out our easy 5 minute demo. All data will remain confidential and anonymity will be ensured.

    We've been really excited to get this project up and running in a Covid-19 world where many workers, students, etc., are transitioning to online alternatives. Please feel free to contact us with any questions and most of all any comments for improvement. Any insights would go a really long way!

    You can access our website at: livesensus.com/

    and the demo directly at: livesensus.com/survey.html

    Has anyone tried or heard of anyone taking on a similar project?

    submitted by /u/punkwrok
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    SQL Database selection

    Posted: 01 Jul 2020 04:01 AM PDT

    What factors do you consider when selecting one sql database over another?

    submitted by /u/supposedlyasian
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    Universal Turing Machine that converts Turing Standard Desription strings or machine numbers into running code (as Swift playground)

    Posted: 30 Jun 2020 08:11 AM PDT

    I want to take MFH4U course during summer school last for 24 days. Is this a good idea? Please advice.

    Posted: 30 Jun 2020 09:51 PM PDT

    Are there subset/superset relations between the languages which can be parsed by these different kinds of parsers?

    Posted: 30 Jun 2020 06:05 AM PDT

    I have been confused by the different types of parsers listed in https://en.wikipedia.org/wiki/Parsing#Types_of_parsers and https://en.wikipedia.org/wiki/Template:Parsers

    1. Are there some top-down and bottom-up parsers which can parse exactly context free languages, no more and no less than CFL's?

    2. LL parsers and recursive-descent parser are listed as Top-Down parsers. I seem to read somewhere LL parsers work exactly for a proper subset of CFL's. Do recursive descent parsers work exactly for all CFL's or a proper subset of CFL's?

    3. LR, CYK, Recursive ascent, and Shift-reduce parsers are listed as bottom up parsers. I seem to read somewhere LR(k), k>=1, parsers work exactly for a proper subset of CFL's. What languages do each of CYK, Recursive ascent, and Shift-reduce parsers work exactly for: the set of all CFL's or a proper subset of CFL's?

    4. Earley parser is listed as mixed parsers (mixing both top-down and bottom-up?). What languages do Early parsers work exxactly for: the set of all CFL's or a proper subset of CFL's?

    Can someone show the subset/superset relations between the languages which can be parsed by these different kinds of parsers? Can these kinds of parsers be listed in a hierarchy?

    Maybe are there some books which have already explained the above?

    Thanks.

    submitted by /u/timlee126
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    Select Max Values from Stream

    Posted: 30 Jun 2020 03:20 PM PDT

    I think think this is a pretty common brainteaser, but I'm having trouble finding a good approach to thinking about this problem.

    You have a stream of values x_i, randomly sampled from uniform distribution [0, 1). You are provided the length of the stream N, your goal is to select M values that maximize your sum. You can't remove or replace a selection in the sequence. What is the optimal strategy, what is the expected value given N, M?

    First thought is that the expected sum E[M=0] = 0 and E[N=M] = 0.5 * M. This is the base case for dynamic programming. At each step in the sequence you have two actions, select the next value or skip it. If you skip the value, you add to your running total E[N-1, M=m]. Otherwise, if you select the value, you add to your running total x_i + E[N-1, M=m-1].

    The expected value can be determined by the weighted sum of these two actions scaled by the probability you choose either action. The probability you select the next value is given by the likelihood x_i exceeds the expected value of skipping it, or p[x > E[N-1, M=m]].

    I'm guessing there's a better way to frame this problem? At least I think this is on the right track to thinking of this as a Dynamic Program, comparing the two available actions.

    This looks like the same idea: https://math.stackexchange.com/questions/179534/the-expected-payoff-of-a-dice-game

    submitted by /u/laxatives
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    Potential topics for an academic presentation

    Posted: 30 Jun 2020 04:30 PM PDT

    Approaching the end of my 10th school year, teachers slowly start to get on my nerves by constantly mentioning the so-called VWA ("vorwissenschaftliche Arbeit"). FYI, I currently attend a grammar school in Austria that has some kind of A-levels students usually attempt in year 12 to enter the world of higher education.

    As stated above, there is the "VWA" which is a combination of a written 40.000 signs text and a ~15 minute long presentation. I'm interested in doing my VWA in computer science class but here's the problem: I have absolutely no clue what kind of topic might work.

    I'm pretty sure you guys are more experienced in this area so what do you think? What topic is interesting enough to be written 40.000 signs about? What topic is "easy" enough for a year 11 student?

    Thanks in advance!

    submitted by /u/Jarrnn
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    [N] Yann LeCun Quits Twitter Amid Acrimonious Exchanges on AI Bias

    Posted: 30 Jun 2020 05:39 PM PDT

    Turing Award Winner and Facebook Chief AI Scientist Yann LeCun has announced his exit from popular social networking platform Twitter after getting involved in a long and often acrimonious dispute regarding racial biases in AI.

    Here is a quick read: Yann LeCun Quits Twitter Amid Acrimonious Exchanges on AI Bias

    submitted by /u/Yuqing7
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    What are the differences between books about writing tools that write parsers and about writing parsers directly?

    Posted: 30 Jun 2020 08:59 AM PDT

    How many hours would it take?

    Posted: 30 Jun 2020 04:23 PM PDT

    How many hours do you think it would take to build a site like this one: http://greetingsisland.com/ ?

    Specifically, do you think it's reasonable, as a junior dev, to build the basic functionality in 100 hours. By basic I mean having the editing tools for the end user, a simple system for uploading new designs, and the print/download buttons?
    Probably the most difficult part it the editing tools.
    In terms of the uploading new designs, probably a CMS like wordpress would take it mush easier.
    what do you think?

    submitted by /u/elireiner2
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    Book Idea?

    Posted: 30 Jun 2020 05:22 AM PDT

    Hey folks, thinking about writing a book titled 'Political Autonomy', similar to Plato's Republic where it discusses how near future tech (AI, IoT, ect.) can be applied to structure the ideal political system across each aspect (Foreign Relations, Economy, Judicial System, ect.) What are your thoughts?

    submitted by /u/hughes7370
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    If any high schoolers are interested in computer science...

    Posted: 30 Jun 2020 07:20 AM PDT

    Please check out r/highschoolcompsci! It's for high schoolers mainly but anyone is welcome and it has amazing resources and community.

    submitted by /u/illustrator101
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