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• how useful is Turing completeness? are neural nets turing complete?

  - by Albert

  While reading some papers about the Turing completeness of recurrent neural nets (for example: Turing computability with neural nets, Hava T. Siegelmann and Eduardo D. Sontag, 1991), I got the feeling that the proof which was given there was not really that practical. For example the referenced paper needs a neural network which neuron activity must be of infinity exactness (to reliable represent any rational number). Other proofs need a neural network of infinite size. Clearly, that is not really that practical. But I started to wonder now if it does make sense at all to ask for Turing completeness. By the strict definition, no computer system nowadays is Turing complete because none of them will be able to simulate the infinite tape. Interestingly, programming language specification leaves it most often open if they are turing complete or not. It all boils down to the question if they will always be able to allocate more memory and if the function call stack size is infinite. Most specification don't really specify this. Of course all available implementations are limited here, so all practical implementations of programming languages are not Turing complete. So, what you can say is that all computer systems are just equally powerful as finite state machines and not more. And that brings me to the question: How useful is the term Turing complete at all? And back to neural nets: For any practical implementation of a neural net (including our own brain), they will not be able to represent an infinite number of states, i.e. by the strict definition of Turing completeness, they are not Turing complete. So does the question if neural nets are Turing complete make sense at all? The question if they are as powerful as finite state machines was answered already much earlier (1954 by Minsky, the answer of course: yes) and also seems easier to answer. I.e., at least in theory, that was already the proof that they are as powerful as any computer.

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• Dependency Injection wcf

  - by Diego Dias

  I want inject a implementation of my Interface in the WCF but I want initialize my container of Dependency Injection in the Client of the WCF. So I can have a different implementation for each client of the my service. Help me please.

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• Loop append div and repeat

  - by Diego Vieira

  I have this code <div class="round-3-top"> <div class="round-2-top"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> <div class="round-2-bottom"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> </div> <div class="round-3-bottom"> <div class="round-2-top"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> <div class="round-2-bottom"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> </div> But i want generate dynamically, how i do that? Ex.: i have 4 rounds, this would be the generated code <div class="round-4-top"> <div class="round-3-top"> <div class="round-2-top"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> <div class="round-2-bottom"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> </div> <div class="round-3-bottom"> <div class="round-2-top"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> <div class="round-2-bottom"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> </div> </div> <div class="round-4-bottom"> <div class="round-3-top"> <div class="round-2-top"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> <div class="round-2-bottom"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> </div> <div class="round-3-bottom"> <div class="round-2-top"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> <div class="round-2-bottom"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> </div> </div> I try using TagBuilder in MVC C# but I can not do. What should happen is, if you are 3 rounds, adding he should go inside each div is like the example above. Any idea how can I develop it?

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• Python subprocess.Popen

  - by Albert

  I have that code: #!/usr/bin/python -u localport = 9876 import sys, re, os from subprocess import * tun = Popen(["./newtunnel", "22", str(localport)], stdout=PIPE, stderr=STDOUT) print "** Started tunnel, waiting to be ready ..." for l in tun.stdout: sys.stdout.write(l) if re.search("Waiting for connection", l): print "** Ready for SSH !" break The "./newtunnel" will not exit, it will constantly output more and more data to stdout. However, that code will not give any output and just keeps waiting in the tun.stdout. When I kill the newtunnel process externally, it flushes all the data to tun.stdout. So it seems that I can't get any data from the tun.stdout while it is still running. Why is that? How can I get the information? Note that the default bufsize for Popen is 0 (unbuffered). I can also specify bufsize=0 but that doesn't change anything.

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• Blackberry ListField Text Wrapping - only two lines.

  - by Diego Tori

  Within my ListField, I want to be able to take any given long String, and just be able to wrap the first line within the width of the screen, and just take the remaining string and display it below and ellipsis the rest. Right now, this is what I'm using to detect wrapping within my draw paint call: int totalWidth = 0; int charWidth = 0; int lastIndex = 0; int spaceIndex = 0; int lineIndex = 0; String firstLine = ""; String secondLine = ""; boolean isSecondLine = false; for (int i = 0; i < longString.length(); i++){ charWidth = Font.getDefault().getAdvance(String.valueOf(longString.charAt(i))); //System.out.println("char width: " + charWidth); if(longString.charAt(i) == ' ') spaceIndex = i; if((charWidth + totalWidth) > (this.getWidth()-32)){ //g.drawText(longString.substring(lastIndex, spaceIndex), xpos, y +_padding, DrawStyle.LEFT, w - xpos); lineIndex++; System.out.println("current lines to draw: " + lineIndex); /*if (lineIndex = 2){ int idx = i; System.out.println("first line " + longString.substring(lastIndex, spaceIndex)); System.out.println("second line " + longString.substring(spaceIndex+1, longString.length())); }*/ //firstLine = longString.substring(lastIndex, spaceIndex); firstLine = longString.substring(0, spaceIndex); //System.out.println("first new line: " +firstLine); //isSecondLine=true; //xpos = 0; //y += Font.getDefault().getHeight(); i = spaceIndex + 1; lastIndex = i; System.out.println("Rest of string: " + longString.substring(lastIndex, longString.length())); charWidth = 0; totalWidth = 0; } totalWidth += charWidth; System.out.println("total width: " + totalWidth); //g.drawText(longString.substring(lastIndex, i+1), xpos, y + (_padding*3)+4, DrawStyle.ELLIPSIS, w - xpos); //secondLine = longString.substring(lastIndex, i+1); secondLine = longString.substring(lastIndex, longString.length()); //isSecondLine = true; } Now this does a great job of actually wrapping any given string (assuming the y values were properly offsetted and it only drew the text after the string width exceeded the screen width, as well as the remaining string afterwards), however, every time I try to get the first two lines, it always ends up returning the last two lines of the string if it goes beyond two lines. Is there a better way to do this sort of thing, since I am fresh out of ideas?

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• refactoring in iSeries (RPG), is it realistic

  - by albert green

  Implementing agile in projects requires the ability to do refactoring. It is not really a must, but code refactoring has proven to be a good engineering practice. In an agile (Scrum) project on the iSeries platform, which requires development (new code and modifications to legacy code) in RPG, RPG LE, is it possible to implement refactoring? If so what are the techniques to do it? If someone who has tried it could share their experience or just point to references, I would greatly appreciate it.

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• Security issue using Nant

  - by Diego C.

  I need to store authentication information and I rather not have the password in plain text: <property name="user" value="theUser"/> <property name="password" value="secret"/> Has anyone figured out a way to encrypt property values in Nant? I've looked in Nant and Nantcontrib docs but no mention of encryption. I am considering going the route of creating my own Nant Task. Any suggestions?

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• g++ on MacOSX doesn't work with -arch ppc64

  - by Albert

  I am trying to build a Universal binary on MacOSX with g++. However, it doesn't really work. I have tried with this simple dummy code: #include <iostream> using namespace std; int main() { cout << "Hello" << endl; } This works fine: % g++ test.cpp -arch i386 -arch ppc -arch x86_64 -o test % file test test: Mach-O universal binary with 3 architectures test (for architecture i386): Mach-O executable i386 test (for architecture ppc7400): Mach-O executable ppc test (for architecture x86_64): Mach-O 64-bit executable x86_64 However, this does not: % g++ test.cpp -arch i386 -arch ppc -arch x86_64 -arch ppc64 -o test In file included from test.cpp:1: /usr/include/c++/4.2.1/iostream:44:28: error: bits/c++config.h: No such file or directory In file included from /usr/include/c++/4.2.1/ios:43, from /usr/include/c++/4.2.1/ostream:45, from /usr/include/c++/4.2.1/iostream:45, from test.cpp:1: /usr/include/c++/4.2.1/iosfwd:45:29: error: bits/c++locale.h: No such file or directory /usr/include/c++/4.2.1/iosfwd:46:25: error: bits/c++io.h: No such file or directory In file included from /usr/include/c++/4.2.1/bits/ios_base.h:45, from /usr/include/c++/4.2.1/ios:48, from /usr/include/c++/4.2.1/ostream:45, from /usr/include/c++/4.2.1/iostream:45, from test.cpp:1: /usr/include/c++/4.2.1/ext/atomicity.h:39:23: error: bits/gthr.h: No such file or directory /usr/include/c++/4.2.1/ext/atomicity.h:40:30: error: bits/atomic_word.h: No such file or directory ... Any idea why that is? I have installed Xcode 3.2.2 with all SDKs it comes with.

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• REST web service keeps first POST parametrs

  - by Diego

  I have a web service in REST, designed with Java and deployed on Tomcat. This is the web service structure: @Path("Personas") public class Personas { @Context private UriInfo context; /** * Creates a new instance of ServiceResource */ public Personas() { } @GET @Produces("text/html") public String consultarEdad (@QueryParam("nombre") String nombre) { ConectorCliente c = new ConectorCliente("root", "cafe.sql", "test"); int edad = c.consultarEdad(nombre); if (edad == Integer.MIN_VALUE) return "-1"; return String.valueOf(edad); } @POST @Produces("text/html") public String insertarPersona(@QueryParam("nombre") String msg, @QueryParam("edad") int edad) { ConectorCliente c = new ConectorCliente("usr", "passwd", "dbname"); c.agregar(msg, edad); return "listo"; } } Where ConectorCliente class is MySQL connector and querying class. So, I had tested this with the @GET actually doing POST work, any user inputed data and information from ma Java FX app and it went direct to webservice's database. However, I changed so the CREATE operation was performed through a webservice responding to an actual POST HTTP request. However, when I run the client and add some info, parameters go OK, but in next time I input different parameters it'll input the same. I run this several times and I can't get the reason of it. This is the clients code: public class WebServicePersonasConsumer { private WebTarget webTarget; private Client client; private static final String BASE_URI = "http://localhost:8080/GetSomeRest/serviciosweb/"; public WebServicePersonasConsumer() { client = javax.ws.rs.client.ClientBuilder.newClient(); webTarget = client.target(BASE_URI).path("Personas"); } public <T> T insertarPersona(Class<T> responseType, String nombre, String edad) throws ClientErrorException { String[] queryParamNames = new String[]{"nombre", "edad"}; String[] queryParamValues = new String[]{nombre, edad}; ; javax.ws.rs.core.Form form = getQueryOrFormParams(queryParamNames, queryParamValues); javax.ws.rs.core.MultivaluedMap<String, String> map = form.asMap(); for (java.util.Map.Entry<String, java.util.List<String>> entry : map.entrySet()) { java.util.List<String> list = entry.getValue(); String[] values = list.toArray(new String[list.size()]); webTarget = webTarget.queryParam(entry.getKey(), (Object[]) values); } return webTarget.request().post(null, responseType); } public <T> T consultarEdad(Class<T> responseType, String nombre) throws ClientErrorException { String[] queryParamNames = new String[]{"nombre"}; String[] queryParamValues = new String[]{nombre}; ; javax.ws.rs.core.Form form = getQueryOrFormParams(queryParamNames, queryParamValues); javax.ws.rs.core.MultivaluedMap<String, String> map = form.asMap(); for (java.util.Map.Entry<String, java.util.List<String>> entry : map.entrySet()) { java.util.List<String> list = entry.getValue(); String[] values = list.toArray(new String[list.size()]); webTarget = webTarget.queryParam(entry.getKey(), (Object[]) values); } return webTarget.request(javax.ws.rs.core.MediaType.TEXT_HTML).get(responseType); } private Form getQueryOrFormParams(String[] paramNames, String[] paramValues) { Form form = new javax.ws.rs.core.Form(); for (int i = 0; i < paramNames.length; i++) { if (paramValues[i] != null) { form = form.param(paramNames[i], paramValues[i]); } } return form; } public void close() { client.close(); } } And this this the code when I perform the operations in a Java FX app: String nombre = nombreTextField.getText(); String edad = edadTextField.getText(); String insertToDatabase = consumidor.insertarPersona(String.class, nombre, edad); So, as parameters are taken from TextFields, is quite odd why second, third, fourth and so on POSTS post the SAME.

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• Entity framework primary keys in Views

  - by Diego

  I have to use a View with the EF but, when e import it, the primary key of the view is displayed incorrectly and for some reason I can't change it.

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• Set default browser when debugging WPF?

  - by Albert Walker

  I'm using VWD Express 2008 to develop a WPF Browser Application. When I start debugging, it launches the XBAP in my default browser, which is Opera. Obviously, XBAPs don't work in Opera, so I have to repeatedly right-click on the document to open in IE. Is there any way to change the settings for PresentationHost.exe so that it always opens with IE? A registry setting, perhaps?

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• How to calculate real-time stats?

  - by Diego Jancic

  I have a site with millions of users (well, actually it doesn't have any yet, but let's imagine), and I want to calculate some stats like "log-ins in the past hour". The problem is similar to the one described here: http://highscalability.com/blog/2008/4/19/how-to-build-a-real-time-analytics-system.html The simplest approach would be to do a select like this: select count(distinct user_id) from logs where date>='20120601 1200' and date <='20120601 1300' (of course other conditions could apply for the stats, like log-ins per country) Of course this would be really slow, mainly if it has millions (or even thousands) of rows, and I want to query this every time a page is displayed. How would you summarize the data? What should go to the (mem)cache? EDIT: I'm looking for a way to de-normalize the data, or to keep the cache up-to-date. For example I could increment an in-memory variable every time someone logs in, but that would help to know the total amount of logins, not the "logins in the last hour". Hope it's more clear now.

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• Generic data input form in asp.net mvc application

  - by Diego

  Hello, I have an application that have EF 16 classes that share this information: They all are classes only with a key field and a description. I think it should be a waste if I make a controller with just 1 method just to present a form to fill these classes info, then I was thinking in to make a generic form(with key, description) and dynamically fill the right class through a sort of selection the selected info in any way, any good suggestion or pattern to do that? Where the generic methods should be located.

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• Parameter Tuning for Perceptron Learning Algorithm

  - by Albert Diego

  Hi, I'm having sort of an issue trying to figure out how to tune the parameters for my perceptron algorithm so that it performs relatively well on unseen data. I've implemented a verified working perceptron algorithm and I'd like to figure out a method by which I can tune the numbers of iterations and the learning rate of the perceptron. These are the two parameters I'm interested in. I know that the learning rate of the perceptron doesn't affect whether or not the algorithm converges and completes. I'm trying to grasp how to change n. Too fast and it'll swing around a lot, and too low and it'll take longer. As for the number of iterations, I'm not entirely sure how to determine an ideal number. In any case, any help would be appreciated. Thanks.

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• List of private iPhone APIs?

  - by diego nunes

  . . Hi there, everybody. . . I need to do an app to be distributed ad hoc (it doesn't need to go to the store) but I need to get the information about the "data usage" (gprs/3g traffic). It is available on the system, but there is no official API call to get that info. One app made it through Apple testing (it's called "Download Meter"), though, and I emailed the guys to see if they would share the call, but they were not in that mood. . . Is there any list of private APIs or anything like that? Does anyone have any ideas of how could I get that info? Again: the app doesn't need to go to the store, but I need to install it on stock iPhone (ad hoc will do). . Thanks.

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• Style of input=File as a button

  - by Diego Correa

  Hello guys, I'm trying to put some style in the input=file aka uploader and I'm having a hard time with it, is there some NON FLASH solution (maybe jquery or even plain javascript)?

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• Expression.Default in .NET 3.5

  - by Diego Mijelshon

  How can I emulate Expression.Default (new in .NET 4.0) in 3.5? Do I need to manually check the expression type and use different code for reference and value types?

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• C++: warning: '...' declared with greater visibility than the type of its field '...::<anonymous>'

  - by Albert

  I'm getting these two warnings (with GCC 4.2 on MacOSX): /Users/az/Programmierung/openlierox/build/Xcode/../../src/main.cpp:154:0 /Users/az/Programmierung/openlierox/build/Xcode/../../src/main.cpp:154: warning: 'startMainLockDetector()::MainLockDetector' declared with greater visibility than the type of its field 'startMainLockDetector()::MainLockDetector::<anonymous' /Users/az/Programmierung/openlierox/build/Xcode/../../src/main.cpp:154:0 /Users/az/Programmierung/openlierox/build/Xcode/../../src/main.cpp:154: warning: 'startMainLockDetector()::MainLockDetector' declared with greater visibility than its base 'Action' In this code: struct Action { virtual ~Action() {} virtual int handle() = 0; }; static void startMainLockDetector() { /* ... */ struct MainLockDetector : Action { bool wait(Uint32 time) { /* ... */ } int handle() { /* ... */ } }; /* ... */ } I'm not exactly sure what these warnings mean (what visibility?) and how to fix them. (I really want the class MainLockDetector to be local for that function only.) I have already compiled the same code with a lot of other compilers (clang, GCC 3.*, GCC 4.0, GCC 4.4, etc) and never got any warning for this code.

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• Encrypting property values in Nant

  - by Diego C.

  I need to store authentication information and I rather not have the password in plain text: <property name="user" value="theUser"/> <property name="password" value="secret"/> Has anyone figured out a way to encrypt property values in Nant? I've looked in Nant and Nantcontrib docs but no mention of encryption. I am considering going the route of creating my own Nant Task. Any suggestions?

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• How to set html content in Moodialog

  - by Diego

  Hello, i've just downloaded Moodialog, a Mootools plugin for dialog, but i have a problem. If content is set via parameters it will be text and not html. Can you help me change the function to accept html? I suppose that this is the code to be edit. setContent: function(){ var content = Array.from(arguments); if (content.length == 1) content = content[0]; this.content.empty(); var type = typeOf(content); if (['string', 'number'].contains(type)) this.content.set('text', content); else this.content.adopt(content); return this; }, I tried to edit 'text' in 'html', but it will not work. Thanks for help (and sorry for my bad english).

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• Rails: How to produce 404 or redirect upon undesired url exploitation?

  - by Baby Diego

  I want to hide the urls for editing users and their profiles behind safer and meaningful urls. For instance, I want /user/13/edit to be /settings/account and /user/13/profile/edit to be /settings/profile. I managed to achieve that, but for that I had to load the user information from the current_user bit from the session. Like so: # users_controller def edit @user = current_user end # profiles_controller def edit @user = current_user @profile = @user.profile end But now, since I can't compare @user.id from the params with the current_user in the session, how can I stop the old urls (/user/13/edit and /user/13/profile/edit) from being exploitable? They always load the forms for the current user, so there's no harm done, but I'd be more comfortable if they just produced a 404 error or something. Thanks in advance.

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• jQuery Validation Engine with Mime

  - by Diego Pucci

  I have this custom rule with tje jQuery validation Engine: "validateMIME": { "func": function(field, rules, i, options){ var fileInput = field[0].files[0]; var MimeFilter = new RegExp(rules[3],'i'); if (fileInput) { return MimeFilter.test(fileInput.type); } else { return true;} }, "alertText": "* Estensione non supportata" }, The problem is that this is working ONLY if the field is required. But in my case the field is not required, but if filled then the Mime type needs to be checked. How do I edit this function to work with non required fields? what's wrong with it? Thanks

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• git: correct way to merge/rebase with respect to svn dcommit

  - by Albert

  I have the following situation (mostly because I didn't really thought it through in the beginning -- or more exactly, I thought it shouldn't be a problem the way I did this but now I am stumbled): ... --- A --- B1 --- ... --- Bn ... --- git-svn Whereby A and git-svn are at the same state (exactly the same files and file content) but they don't have any common point in history. And I want: ... --- git-svn --- B1 --- ... --- Bn Or at least, when I do the svn dcommit, I want exactly to get the commits B1 to Bn and nothing else. I am not exactly sure how dcommit works. So if I would get something like this: ... ------------ A --- B1 --- ... --- Bn \ \ ... --- git-svn -- A' ----------------- B' would the dcommit behave in the way I want? Because if so, that would be easy to get (merging A into git-svn does work just fine because they are content-wise the same). Or should I do some sort of rebase? But I don't want to rebase A on git-svn, just B1 to Bn.

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• grabbing a substring while scraping with Python2.6

  - by Diego

  Hey can someone help with the following? I'm trying to scrape a site that has the following information.. I need to pull just the number after the </strong> tag.. [<li><strong>ISBN-13:</strong> 9780375853401</li>, <li><strong>Pub. Date: </strong> 05/11/2010</li>] [<li><strong>UPC:</strong> 490355000372</li>, <li><strong>Catalog No:</strong> 15024/25</li>, <li><strong>Label:</strong> CAMERATA</li>] here's a piece of the code I've been using to grab the above data using mechanize and BeautifulSoup. I'm stuck here as it won't let me use the find() function for a list br_results = mechanize.urlopen(br_results) html = br_results.read() soup = BeautifulSoup(html) local_links = soup.findAll("a", {"class" : "down-arrow csa"}) upc_code = soup.findAll("ul", {"class" : "bc-meta3"}) for upc in upc_code: upc_text = upc.contents.contents print upc_text

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• Python Scraper for Javascript?

  - by Diego

  Hey all, Can anyone direct me to a good Python screen scraping library for javascript code (hopefully one with good documentation/tutorials)? I'd like to see what options are out there, but most of all the easiest to learn with fastest results... wondering if anyone had experience. I've heard some stuff about spidermonkey, but maybe there are better ones out there? Specifically, I use BeautifulSoup and Mechanize to get to here, but need a way to open the javascript popup, submit data, and download/parse the results in the javascript popup. <a href="javascript:openFindItem(12510109)" onclick="s_objectID=&quot;javascript:openFindItem(12510109)_1&quot;;return this.s_oc?this.s_oc(e):true">Find Item</a> I'd like to implement this with Google App engine and Django. Thanks!

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