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    How does compression work really? Computer Science

    October 24, 2020

    How does compression work really? Computer Science

    How does compression work really?

    Posted: 23 Oct 2020 09:39 PM PDT

    This may not be the best place to ask this question but I can't find a better place. Ubuntu 20.10 came out for Raspberri Pi and the download file is 1.68 GB, but when the file is extracted, the extracted .iso file is 8.75 GB! How are they able to achieve these levels of compression? I'm sorry if this is a dumb question, I just want to learn.

    submitted by /u/SithLordZX
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    [R] Google Brain Sets New Semi-Supervised Learning SOTA in Speech Recognition

    Posted: 23 Oct 2020 02:08 PM PDT

    A team of researchers from Google Brain has improved the SOTA on the LibriSpeech automatic speech recognition task, with their score of 1.4 percent/ 2.6 percent word-error-rates bettering the previous 1.7 percent/ 3.3 percent. The team's novel approach leverages a combination of recent advancements in semi-supervised learning, using noisy student training with adaptive SpecAugment as the iterative self-training pipeline and giant Conformer models pretrained using the wav2vec 2.0 pretraining method.

    Here is a quick read: Google Brain Sets New Semi-Supervised Learning SOTA in Speech Recognition

    The paper Pushing the Limits of Semi-Supervised Learning for Automatic Speech Recognition is on arXiv.

    submitted by /u/Yuqing7
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    What constitutes an event in operating systems?

    Posted: 23 Oct 2020 06:07 PM PDT

    I've been browsing around and re-reading my notes, but I can't seem to comprehend what exactly constitutes an event. Is there certain conditions they have to meet, if so what are they?

    Ex. opening a file, saving a file to the hardrive, or compressing a folder, or opening a folder. Are all those events?

    submitted by /u/Calidude7
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    Jio WiFi Dongle Problems

    Posted: 24 Oct 2020 03:10 AM PDT

    Hey Everyone,

    This is my first Reddit Post. So anyway, the problem:

    I use a Jio dongle for wifi (JMR1040). And recently I noticed that whenever i was browsing the internet, say loading a link, Chrome would give me a "Network Interrupted" Error. Then when I tried doing a speed test on speedtest.net, it would say Socket Error Occured, and no I do not have this problem on other networks so its not my pc.

    Does anyone have any idea why and what to do to fix this?

    Thanks,N

    submitted by /u/Nightshade4317
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    OS - Virtual memory/paging

    Posted: 24 Oct 2020 02:14 AM PDT

    So virtual memory is used to give the illusion that a process has access to all the available memory, so if a Level N node addressed say 4GB page size, and my process had 200MB. It would only require one level N page table? So its only using 200MB but can use "4GB".

    Have I got this concept right?

    submitted by /u/ap_100
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    Is it possible for a compiler to reduce the size of a const int?

    Posted: 24 Oct 2020 01:52 AM PDT

    Ok, I didn't really know how to word that effectively for a title.

    So I've started learning more about memory handling. For example, an int in Java uses 4 bytes regardless of the number.

    My question is say I declare the following:

    final int PRICE_PER_UNIT = 2

    I'm telling the compiler that this value will not change, will it still allocate the full 4 bytes, or will it reduce the size of this value to 2 bits since that's all we need to represent the number 2?

    If the former, is there a reason why a feature like this hasn't been implemented, it seems like a fantastic method to reducing memory usage in a script.

    submitted by /u/stratcat22
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    Dynamic Sky Replacement and Harmonization in Videos

    Posted: 23 Oct 2020 08:26 PM PDT

    how to test and compare your proposed algorithm ?

    Posted: 23 Oct 2020 11:35 PM PDT

    How important is cybersecurity for the future in comparison to something like AI or Physics?

    Posted: 23 Oct 2020 10:42 AM PDT

    I am interested in cybersecurity but at the same time also in other things, such as Physics or AI.

    I am not sure what path I should pursue as I feel like innovations in something like AI or Physics would be way more beneficial to humanity (ex. quantum computers, AGI, etc.) than something like cybersecurity. Is there any overlap between all of these, so I could maybe study cybersecurity by myself and go to university for Physics or something else for example?

    submitted by /u/computer_man789
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    Testing for Parallel Computing Capacity

    Posted: 23 Oct 2020 10:39 AM PDT

    It is obvious that even consumer devices are capable of parallel computing, and since basically all of my work in A.I. relies upon parallel computing, I'm now taking a closer look at the issue in connection with a state space algorithm I'm working on, that requires the capacity for parallel computing to be allocated to different threads of the state space according to a formula.

    This first requires knowing how much capacity the machine has for parallel computing. This kind of information is probably not going to be easy to find, and may not even be available, so I've written a simple script that should allow you to approximate how much capacity for parallel computing your machine actually has, which will probably depend upon the language you use, which is in this case, Octave / Matlab, languages plainly designed for exactly this purpose –

    To achieve vectorization.

    I'm pretty sure you could do the same in Python, I just happen to work in Octave.

    Here's a simple script that should allow you to measure where your machine's capacity for vectorization starts to drop off:

    https://derivativedribble.wordpress.com/2020/10/23/testing-parallel-computing-capacity/

    submitted by /u/Feynmanfan85
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    How good is CS50 for A level Compsci?

    Posted: 23 Oct 2020 08:04 AM PDT

    i want to do compsci at a level and was wondering how i would get a long if i did the cs50 course first before i get into a level

    submitted by /u/mo_10
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