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  • Measuring the performance of classification algorithm

    - by Silver Dragon
    I've got a classification problem in my hand, which I'd like to address with a machine learning algorithm ( Bayes, or Markovian probably, the question is independent on the classifier to be used). Given a number of training instances, I'm looking for a way to measure the performance of an implemented classificator, with taking data overfitting problem into account. That is: given N[1..100] training samples, if I run the training algorithm on every one of the samples, and use this very same samples to measure fitness, it might stuck into a data overfitting problem -the classifier will know the exact answers for the training instances, without having much predictive power, rendering the fitness results useless. An obvious solution would be seperating the hand-tagged samples into training, and test samples; and I'd like to learn about methods selecting the statistically significant samples for training. White papers, book pointers, and PDFs much appreciated!

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  • imported vm gives "failed to open/create network" error

    - by Colleen
    steps: 1. created a vm in windows 2. partitioned drive and installed ubuntu 3. exported the vm I created 4. mounted windows drive in ubuntu 5. imported the vm from the export, in the mounted drive 6. tried to start vm, got the following error: "Failed to open a session for the virtual machine XXXX. Failed to open/create the internal network 'HostInterfaceNetworking-Intel(R) 82579LM Gigabit Network Connection' (you might need to modprobe vboxnetflt to make it accessible) (VERR_INTNET_FLT_IF_NOT_FOUND). Result Code: NS_ERROR_FAILURE (0x80004005) Component: Console Interface: IConsole {1968b7d3-e3bf-4ceb-99e0-cb7c913317bb} " Network settings: Adapter 1: PCnet-FAST III (Bridged adapter, Intel(R) 82579LM Gigabit Network Connection)

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  • Distance between hyperplanes

    - by michael dillard
    I'm trying to teach myself some machine learning, and have been using the MNIST database (http://yann.lecun.com/exdb/mnist/) do so. The author of that site wrote a paper in '98 on all different kinds of handwriting recognition techniques, available at http://yann.lecun.com/exdb/publis/pdf/lecun-98.pdf. The 10th method mentioned is a "Tangent Distance Classifier". The idea being that if you place each image in a (NxM)-dimensional vector space, you can compute the distance between two images as the distance between the hyperplanes formed by each where the hyperplane is given by taking the point, and rotating the image, rescaling the image, translating the image, etc. I can't figure out enough to fill in the missing details. I understand that most of these are indeed linear operators, so how does one use that fact to then create the hyperplane? And once we have a hyperplane, how do we take its distance with other hyperplanes?

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  • Wastage of resources in Virtualization

    - by Sabeen Malik
    I am not sure if this is the write place to ask the question. However i hope it is. When looking for a VPS earlier today, I was trying to understand how each container would work in the background. Keeping in mind the fact that the operating system uses most of the power and power on a system, wouldn't having multiple operating systems in the same machine mean more wastage of resources. For instance if i was running centOS on a dedicated box and it was running lets say 20 background OS level processes. Then i go and install a virtualization platform and install 5 more centOS virtual machines in the same system which are exactly the same as the host operating system. Doesn't this mean duplication of those 20 processes 6 times? So internally the context switching is happening between 120 processes instead of 20?

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  • Count the number of objects in an Image

    - by kunjaan
    I am investigating the possibility of image processing to identify certain objects and also count them in an image. I will be given a picture and I need to identify the number of boxes present in that image. Does anybody have any experience with any Machine Vision/ Image Processing libraries like ImageJ, Fiji, JAI, jMagick ,Java Vision Toolkit? Which do you think is best suited for the job? What do you guys suggest? If the APIs can be used from Java, it would be better. Thank you. Edit: I am dealing with warehouse brown boxes. Yes I am talking about regular photos. The source is usually a mobile phone picture.

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  • ASP.net machine config file

    - by nettguy
    Consider , I make configuration setting (like membership provider) DB Connnection,etc in "machine.config", and remove the "web.config" file from my current application ,will my application work without giving any trobule?Is it accepted practice in .NET?

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  • Rails deployment from a windows machine

    - by Kenji Crosland
    I'm a rails novice and just finished my first rails app(as far as I can tell). Now I'm at the deployment stage and find myself utterly confused--especially because I'm deploying from a windows machine. I bought the pragmatic book on deployment and it seems a little out of date since they're recommending subversion instead of Git. What would be the easiest deployment method these days for someone doomed to use windows? Are there any good up-to-date tutorials on deployment from Windows?

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  • A Turing Machine Question

    - by Hellnar
    Greetings, I have been struggling to find a question regarding this theoretical question, even tho it is not directly a programming question, I believe it is really related. Assume a type of Turing machine which cannot have more than 1000 squares. What would be the relationship between the set of such type of recognizable languages and set of normal recognizable languages.

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  • jRuby and Matz's Ruby on the same machine?

    - by erhard
    Is it possible to run jRuby and native ruby on the same machine? For example installing rake or gem under both it find's Matz Ruby extensions /usr/bin/gem or /usr/bin/rake The MRI gems and jruby gems are mixed up. Is there any experience in that constellation ? Thanks erhard

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  • using FUSLOGVW.EXE on a machine with no Visual Studio installed

    - by Gerrie Schenck
    I'm currently having some assembly binding problems on our development server. I want to investigate the problem a bit further with Fusion Log Viewer. Since there is no Visual Studio installed on the machine, I copied FUSLOGVW.EXE to a local folder and started it there. Is this supposed to work or does it need something else? I don't get the impression the application is logging any failures (and yes I have the settings right).

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  • Official multiple python versions on the same machine?

    - by drozzy
    Is there an official documentation on python website somewhere, on how to install and run multiple versions of python on the same machine? On linux? I can find gazillions of blog posts and answers - but I want to know if there is a "standard" official way of doing this? Or is this all dependent on OS?

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  • AJAX call works on local machine, not on host

    - by superexsl
    hey everyone, What could potentially stop an AJAX call from working on the host server, when it works fine on the local host? I tried returning an error from the AJAX call, but all I get is 'undefined'. I don't think the actual page method is being called since no information is added in my log (and I've explicitly added a call). I can't reproduce the problem on my local machine, so does anyone know possible areas I should look into? Thanks

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  • OpenGL Polygon Stipple Not Working On Different Machine

    - by FranticPedantic
    I have a situation where I am trying to draw a semi-transparent rectangle over a background that is not using openGL and so I can not use blending. I decided to use polygon stippling for a 'screen door transparency' effect as recommended by some. It works fine on my machine and some others, but on some machines with slightly old Intel graphics cards it's failing to render the rectangle at all. If I turn off polygon stipple, it renders fine (but without the stipple). I have compared many of the state variables that I thought might affect it (see code) between machines and they are all the same, and I get no errors. static const GLubyte stipplePatternChkr[128]; //definition omitted for clarity //but works on my machine // stipple the box glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); glColor4ubv(Color(COLORREF_PADGRAY)); glEnable(GL_POLYGON_STIPPLE); glPolygonStipple(stipplePatternChkr); CRect rcStipple(dim); rcStipple.DeflateRect(padding - 1, padding - 1); glBegin(GL_QUADS); glVertex2i(rcStipple.left, rcStipple.bottom); glVertex2i(rcStipple.right, rcStipple.bottom); glVertex2i(rcStipple.right, rcStipple.top); glVertex2i(rcStipple.left, rcStipple.top); glEnd(); glDisable(GL_POLYGON_STIPPLE); int err = glGetError(); if (err != GL_NO_ERROR) { TRACE("glError(%s: %s)\n", s, gluErrorString(err)); } float x; glGetFloatv(GL_UNPACK_ALIGNMENT, &x); TRACE("unpack alignment %f\n", x); glGetFloatv(GL_UNPACK_IMAGE_HEIGHT, &x); TRACE("unpack height %f\n", x); glGetFloatv(GL_UNPACK_LSB_FIRST, &x); TRACE("unpack lsb %f\n", x); glGetFloatv(GL_UNPACK_ROW_LENGTH, &x); TRACE("unpack length %f\n", x); glGetFloatv(GL_UNPACK_SKIP_PIXELS, &x); TRACE("upnack skip %f\n", x); glGetFloatv(GL_UNPACK_SWAP_BYTES, &x); TRACE("upnack swap %f\n", x);

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  • MVC app not working on server but is fine on development machine

    - by GB
    Hello, I am able to run my application just fine on my dev machine but as soon as I publish it to the web server some functionality is lost. Any type of .ajax POST does not work usually with a 401 unauthorized error. The server is Windows 2008 with IIS7. I also installed Visual Studio 2008 with MVC2 on the server and ran the application directly on the server and the same .ajax POST does not work but the error changed to 500 unknown. Thanks for the help.

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  • Attaching Files to QC defect by Java code from local machine

    - by Rahul
    Hi All, When we open a defect in QC generally we need to attach the logs of the server i want to Make an application such that It will take files(logs from all the relevant server) and stores in our local machine and then we can rar those files and directly attach it to QC defect mentioned by person opening defect Now my question is how can i access the defect and attach the files to that particular defect Please give your suggestions if any

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