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  • Solving Kaggle’s Bike Sharing Demand Machine Learning Problem

    - by Gopinath
    Kaggle.com hosts a lot of interesting machine learning problems online and thousands of its members compete to solve them for a bounty. Problems hosted on Kaggle has varying complexity to accomodate newbies to rock star developers – few problems are good enough for  newbies to learn basics of machine learning and few of them challenge the best of machine learning developers. I’m learning basics of machine learning for the past few weeks and had an opportunity to solve Kaggel’s Bike Sharing Demand problem. Bike Sharing systems allows customers to rent a bike (or a cycle as it is called in many part of the world) for several hours and return them back . The problem provides historical information about the demand for bike sharing business and we need to forecast the demand. For more information on the problem, visit Kaggle.com website. Here is the solution I written using random forests algorithm using R programming language and you can download the source code from github.  With this solution I was able to score RMSLE of 0.70117, which placed me somewhere in the mid of the leader board.  This is the best score I could get by spending 4 hours of my time. Please feel free to fork the code and improve it.   Get Kaggle Bike Sharing Demand solution code from GitHub

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  • Javascript: Machine Constants Applicable?

    - by DavidB2013
    I write numerical routines for students of science and engineering (although they are freely available for use by anybody else as well) and am wondering how to properly use machine constants in a JavaScript program, or if they are even applicable. For example, say I am writing a program in C++ that numerically computes the roots of the following equation: exp(-0.7x) + sin(3x) - 1.2x + 0.3546 = 0 A root-finding routine should be able to compute roots to within the machine epsilon. In C++, this value is specified by the language: DBL_EPSILON. C++ also specifies the smallest and largest values that can be held by a float or double variable. However, how does this convert to JavaScript? Since a Javascript program runs in a web browser, and I don't know what kind of computer will run the program, and JavaScript does not have corresponding predefined values for these quantities, how can I implement my own version of these constants so that my programs compute results to as much accuracy as allowed on the computer running the web browser? My first draft is to simply copy over the literal constants from C++: FLT_MIN: 1.17549435082229e-038 FLT_MAX: 3.40282346638529e+038 DBL_EPSILON: 2.2204460492503131e-16 I am also willing to write small code blocks that could compute these values for each machine on which the program is run. That way, a supercomputer might compute results to a higher accuracy than an old, low-level, PC. BUT, I don't know if such a routine would actually reach the computer, in which case, I would be wasting my time. Anybody here know how to compute and use (in Javascript) values that correspond to machine constants in a compiled language? Is it worth my time to write small programs in Javascript that compute DBL_EPSILON, FLT_MIN, FLT_MIN, etc. for use in numerical routines? Or am I better off simply assigning literal constants that come straight from C++ on a standard Windows PC?

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  • Were the first assemblers written in machine code?

    - by The111
    I am reading the book The Elements of Computing Systems: Building a Modern Computer from First Principles, which contains projects encompassing the build of a computer from boolean gates all the way to high level applications (in that order). The current project I'm working on is writing an assembler using a high level language of my choice, to translate from Hack assembly code to Hack machine code (Hack is the name of the hardware platform built in the previous chapters). Although the hardware has all been built in a simulator, I have tried to pretend that I am really constructing each level using only the tools available to me at that point in the real process. That said, it got me thinking. Using a high level language to write my assembler is certainly convenient, but for the very first assembler ever written (i.e. in history), wouldn't it need to be written in machine code, since that's all that existed at the time? And a correlated question... how about today? If a brand new CPU architecture comes out, with a brand new instruction set, and a brand new assembly syntax, how would the assembler be constructed? I'm assuming you could still use an existing high level language to generate binaries for the assembler program, since if you know the syntax of both the assembly and machine languages for your new platform, then the task of writing the assembler is really just a text analysis task and is not inherently related to that platform (i.e. needing to be written in that platform's machine language)... which is the very reason I am able to "cheat" while writing my Hack assembler in 2012, and use some preexisting high level language to help me out.

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  • Cloning a git repository from a machine running OS X

    - by Mike
    Hi folks, I'm trying to host a git repository from my home OS X machine, and I'm stuck on the last step of cloning the repository from a remote system. Here's what I've done so far: On the OS X (10.6.6) machine (heretofore dubbed the "server") I created a new admin user Logged into the new user's account Installed git Created an empty git repository via "git init" Turned on remote login Set port mapping on my router (airport extreme) to send ssh traffic to the server Added a ".ssh" directory to the user's home directory From the remote machine (also an OS X 10.6.6 machine), I sent that machine's public key to the server using scp and the login credentials of the user created in step 1 To test that the server would use the remote machine's public key, I ssh'd to the server using the username of the user created in step 1 and indeed was able to connect successfully without being asked for a password I installed git on the remote machine From the remote machine I attempted to "git clone ssh://[email protected]:myrepo" (where "user", "my.server.address", and "myrepo" are all replaced by the actual username, server address and repo folder name, respectively) However, every time I try the command in step 11, I get asked to confirm the server's RSA fingerprint, then I'm asked for a password, but the password for the user I set up for that machine never works. Any advice on how to make this work would be greatly appreciated!

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  • Oracle Technológia Fórum, 2010. május 5.

    - by Fekete Zoltán
    Holnap, május 5-ikén lesz Exadata/Database Machine eloadás is (by me). Többek között elmondom, hogyan lehet a Database Machine, Exadata környezeteket patch-elni: Database, Exadata, további elemek. Oracle Technológia Fórum rendezvény, 2010. május 5. szerda. Tessék jönni, kérdezni.

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  • Exadata videó: az oszi érkezés Budapesten a Sysmanhoz

    - by Fekete Zoltán
    Tekintse meg a videót az elso Oracle Exadata Database Machine adatbázisgép megérkezésérol Magyarországra a Sysman Exadata Teszt és Demonstrációs Központba, ahol az extrém nagy adatbázis teljesítményt nyújtó megoldás tesztelheto és kipróbálható. A videót a Sysman készítette, megtekintheto itt: Oracle Exadata Database Machine - Hungary Amik eloször eszembe jutottak: felvillanyozó és hosies. :) Dinamikus a vágás és remek a zene választás. A másik videóról már korábban írtam blogbejegyzést, ami magáról az Exadata Teszt és Demonstrációs Központról szól: Videó a Sysman Exadata demó centrumáról

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  • Moving MS Exchange 2007 to another machine

    - by Mustafa Ismail Mustafa
    We have a machine that has been chugging along with the burden of both Exchange and DC and DNS all with SBS 2008. We have a better machine now and I'd like to move Exchange 2007 to that machine and take it off of this machine. In fact, I'm planning on formatting the old machine and get rid of SBS all together because it is making the machine SLOW. How would I go about making the move? I've read on previous versions of Exchange (2000), that all you do is install Exchange on the new machine and then start moving mailboxes one after the other. Well, what about all the different rules we have in place? How do those get moved? How do we de-commission the old exchange and set up the new exchange as the primary one? Come to think of it, how do we have both exchanges recognize each other on the same domain? TIA

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  • X11 display over ssh with monitor connected to remote machine

    - by Sumit
    I have the following setup: Machine A (a.corp, 192.168.100.130, local machine) and Machine B (b.corp, remote machine) and a monitor is connected to each of these machines. When I ssh from a.corp to b.corp as $ ssh -X b.corp $ xclock Error: Can't open display: I tried setting the DISPLAY variable as $ ssh -X b.corp $ export DISPLAY=`echo $SSH_CLIENT|cut -f1 -d\ `:0.0 $ echo $DISPLAY 192.168.100.130:0.0 $ xclock xclock's display opens up but on the monitor connected to b.corp (remote machine) and not on the monitor connected to a.corp (local machine). Is there a way to force the display to appear on the monitor of the local machine (a.corp)?

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  • SharePoint 2010 Development on Virtual Machine - Windows 7 or Server 2008?

    - by webworm
    I recently switched to a MacBook Pro for my development machine (for many reasons). I want to setup a Virtual Machine for ASP.NET, IIS, and Visual Studio 2010 development. I also have need to do some development work with SharePoint 2010. What I am wondering is if I should use Windows 7 (64 bit) or Windows Server 2008 (64 bit) as the OS for my development virtual machine. I don't really need most of the services running in Server 2008 so I felt that Windows 7 would probably run faster in the VM environment however I am fairly new to SharePoint 2010 so I am not sure if Windows 7 (64 bit) can be used as a development environment for it. Thanks for any input.

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  • Ikoula lance sa machine virtuelle à 1 Euro, l'hébergeur veut concurrencer Amazon et son offre EC2

    Ikoula lance sa machine virtuelle à 1€ L'hébergeur veut concurrencer Amazon et son offre EC2 Ikoula lance une offre Cloud qu'il qualifie de « unique sur le marché ». Destinée à concurrencer Amazon, et son offre EC2, l'hébergeur informatique a décidé de proposer une VM (machine virtuelle) à 1 €. Le principe est simple. Une franchise de 1€ donne accès à une machine d'une configuration standard. Le supplément est facturé à l'usage. « La VM à 1€ a été conçue pour apporter aux utilisateurs un maximum de flexibilité et d'élasticité dans la consommation de leurs ressources », explique Ikoula Mais que r...

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  • How to Forward Ports to a Virtual Machine and Use It as a Server

    - by Chris Hoffman
    VirtualBox and VMware both create virtual machines with the NAT network type by default. If you want to run server software inside a virtual machine, you’ll need to change its network type or forward ports through the virtual NAT. Virtual machines don’t normally need to be reachable from outside the virtual machine, so the default is fine for most people. It actually provides some security, as it isolates the virtual machine from incoming connections. How To Switch Webmail Providers Without Losing All Your Email How To Force Windows Applications to Use a Specific CPU HTG Explains: Is UPnP a Security Risk?

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  • Mount exFAT partition in virtual guest machine

    - by Alain Jacomet
    I have a real Ubuntu 12.10 installation being virtualized under a Windows 8 host, by using the VBoxManage.exe internalcommands createrawvmdk method. I'm trying to mount an exFAT partition into the virtualized machine (which is the partition of shared work files), but even though I have fuse-exfat installed, and the partition is perfectly mountable while booting entirely into Ubuntu, I can't mount it while virtualizing it. 1- If I make a full vmdk image of the HDD, including all partitions, Ubuntu 12.10 "sees" the partition, and trying to mount it throws this error: Image: http://i.stack.imgur.com/AyUSn.png 2- If I make a machine with only the linux partitions, + the exFAT partition. Again Ubuntu "sees" the partition and the result is: Error: fsync failed Image: http://i.stack.imgur.com/u4SkC.png 3- If I make a machine with only the linux partitions, and try to mount it, Ubuntu doesn't "see" the partition, and I get this error: Image: i.stack.imgur.com/q1hz5.png I've tried using the VirtualBox' "Shared Folders" functionality but even though I install the "Guest Additions", the system doesn't seem to recognize the shared folder: Image: i.stack.imgur.com/yLU0E.png Help? Thanks!

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  • Getting Ethernet driver to crippled machine

    - by Richard
    The reply at How do I install drivers for the Atheros AR8161 Ethernet controller? probably helps me. I have a Toshiba S855, bought yesterday. lspci -vv | grep Atheros command from the terminal shows me I have the AR8161 Gigabit Ethernet controller (rev 10) However the answer sudo apt-get install ... requires an internet connection. How can I, using another machine, capture the necessary information on that other machine to copy across to the crippled machine, and then how do I build from there. Thanks in anticipation

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  • Things to install on a new machine revisited

    as I prepare to get a new dev machine at work, I write the things I am going to install on it, before writing the first line of code on that machine: Control Freak Tools: Everything Search Engine a free and amazingly fast search engine for files all over your machine. (just file names, not inside files). This is so fast I use it almost as a replacement for my start menu, but its also great for finding those files that get hidden and tucked away in dark places on my system. Ever had a situation...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • iOS build machine setup: problem with certificates

    - by cbrulak
    some background: work with multiple team mates each work on our own MBP I'm setting a build machine that we can git push to in order to generate a build (aim to allow anyone to push to the build machine and then generate an archive, upload to testflight and send on its way) problem: getting my apple developer certificates on the build machine. I installed Lion, XCode, etc and I signed into my developer account through Xcode organizer, provisioning profiles download,etc. but beside each one it says: valid signing identity not found I also download my certificate from the developer.apple.com page, imported it into keychain, etc but no luck. Anyone else have a similar issue? Or maybe hints to fix? Thanks

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  • Kernel Panic Fatal Machine Check

    - by 0x4a6f4672
    I have got a new Samsung Series 7 laptop with dual boot setup for Windows 8 and Ubuntu 12.10. The Ubuntu installation was quite a hassle, but with the help of Boot Repair finally it seemed to work. Or so I thought. Windows 8 starts fine, but if I want to start Ubuntu regularly the following error occurs, quite similar to this one [Hardware Error] CPU 1: Machine Check Exception: 5 Bank 6 [Hardware Error] RIP !inexact! 33 <00007fab2074598a> [Hardware Error] TSC 95b623464c ADDR fe400 MISC 3880000086 .. [similar messages for CPU 2,3 and 0] .. [Hardware Error] Machine Check: Processor context corrupt Kernel panic - not syncing: Fatal Machine Check Rebooting in 30 seconds Kernel panic does not sound good. Then it starts to reboot, and the second boot trial often works. Is it a Kernel or driver problem? The laptop has an Intel Core i7 processor. I already deactivated Hyperthreading in the BIOS, but it does not seem to help :-(

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  • Virtual box doesnt have files machine and help tab

    - by user54986
    this is the second time im asking this question because someone had to close my question for a reason which i still dont understand. this is the original question Why is my files,machine,help tab missing in ubuntu 11.10? Most importantly ,i cannot access the machine menu that should be there but isnt. im using ubuntu 11.10 with oracle 4.1.10 heres a picture of what ubuntu should look like,or maybe i am wrong, http://i.stack.imgur.com/JgM5S.png The reason why im asking,is because id like to run a usb key inside my virtual box,but since i cannot access machine,i cant access the devices manager either. Just for your information,ive already installed the guest additions.

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  • saving ubuntu settings to load into a new machine

    - by CodeKingPlusPlus
    I will soon be receiving a new machine (yes, I need the improved performance!) how can I transfer over all of my current Ubuntu settings and files to the new machine. This is very important because I have many packages installed from apt-get, python packages, emacs packages and so forth. I really want to avoid installing all of the same packages over again. I am currently running Ubuntu 12.04 LTS. What is the best solution in transferring my current ubuntu settings and files to a new machine? Let me know if you need more information. All help is greatly appreciated!

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  • How can I run the same Linux Installation on my hardware and in a virtual machine?

    - by LithMaster
    I've started some development that requires Linux (I'm currently on Ubuntu, but I may switch to Debian), but I still use Windows 7 for my day-to-day computing. I have already tried a dual-boot setup, but I've found that it is too cumbersome to switch between Linux and Windows. I'm wondering if it's possible to setup an installation of Linux (again, Ubuntu or Debian) on a partition of my hard drive that I can also run from Windows in a virtualized environment.

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  • Use Mac Pro as time machine, server and editing station?

    - by Dan
    Background: My fiancée needs a Mac Pro for movie editing and rendering. I need a web server and a backup solution for my MacBook Pro. Idea We thought we could split the costs of the Mac Pro and set it up to act as both a web server and a backup device. Question Is this a good idea? Specifically: Is it easy to set it up to incrementally backup one or several laptops over wifi? And what software would you recommend? Is it silent and stable enough to run a web server continuously? Will it manage all this, including simultaneous editing? Thanks.

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  • How can I run a Virtual Machine in Windows 8 Developer Preview?

    - by Marc Gravell
    Since having issues installing Ubuntu side-by-side with Windows 8, I thought I'd try running Ubuntu in a VM instead. However, VMWare player has no love for Windows 8 yet (invalid VM86 or something similar), and AFAIK the promised hypervisor options are not currently available for playing with. So: Are there any VM hosts that do work in Windows 8 Developer Preview at this point? (specifically for running Ubuntu) Alternatively, does Wubi work on Windows 8? It seems not; from Wubi: An error occurred: 'WindowsBackend' object has no attribute 'iso_path'

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  • VirtualPC/XPMode... trying to let a VM access pages served using IIS on the host machine

    - by John
    My host PC is running IIS7.5 under Windows7. I have a VM running XP to let me use IE6, but I've no idea what network settings on the VM/host are needed so the VM can access pages on the host. I thought if the host was 192.168.1.1, then from the VM I'd simply do http://192.168.1.1/... if I do this on the host it works but the VM can't see it. I'm assuming there are some shortcuts here rather than manually having to set up loads of permissions, e.g a shortcut way of letting the VM access the host maybe?

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