Machine Learning, Uncategorized, Windows 10

Running Tensorflow with native Linux Binaries in the Windows Subsystem for Linux

After 4 hours of unsuccessful attempts to set up tensorflow in Docker on Windows, I decided to – just for fun – try to run it in the shiny new Windows Subsystem for Linux on my Windows 10 Insider Preview Build 14332. What began with low expectations turned out to be very successful, so here are the steps: First enable the Windows Subsystem for Linux in the “Turn Windows features on or off” dialog: Then open the Ubuntu Bash and update the package index: You can now proceed to install pip for Python 2: Now install the CPU-enabled Linux x64 tensorflow package:: Tensorflow is now installed. With the following command, you can get the directory of the installed package: This should give something like “/usr/local/lib/python2.7/dist-packages/tensorflow”. Now let’s cd to the directory with the example implementation of a CNN for the MNIST dataset: And run the convolutional neural network: In the…

Arduino, C#, Hardware, Root, Windows 8, WinRT

Arduino as a MIDI/Bluetooth Relay for Windows 8.1 Apps

In my last post I described how a Bluetooth connection between Arduino and a Windows 8.1 device can be established. The next step for me was to connect the Arduino to my electronic drum kit which has both, a MIDI-IN and a MIDI-OUT jack, but any other electronical instrument will do as well. The wiring diagram for an Arduino Uno R3 with MIDI-IN/OUT and the JY-MCU Bluetooth module is shown in Fig.1. NOTE: Occasionally there are MIDI shields available for Arduino, so you might not have to build it on your own. The Arduino code to relay MIDI>Bluetooth and Bluetooth>MIDI is actually quite simple. //======================================================authorship //by Michael Osthege (2013) //======================================================includes #include “SoftwareSerial.h” //======================================================constants const int TX_BT = 10; const int RX_BT = 11; const int MIDI_TX = 1; const int MIDI_RX = 0; //======================================================bluetooth setup SoftwareSerial btSerial(TX_BT, RX_BT); //======================================================initialization void setup() {     Serial.begin(31250);     btSerial.begin(9600);     Serial.println(“Bluetooth initialized”); }…

Arduino, C#, Hardware, Windows 8, WinRT

Bluetooth communication between Arduino and Windows 8.1

Introduction Recently, after being inspired by this video of Arduino Bluetooth communication with Windows Phone 8 by Marcos Pereira, I got myself some new devices to play with: Arduino Uno R3 in a starter kit (link) JY-MCU Bluetooth module (link) and a few extra cables The thing is: I don’t have a Windows Phone 8 yet and the Windows Phone 7.8 APIs do not support this kind of Bluetooth communication. But: I have a Surface RT and with Windows 8.1 the RFCOMM API can be used to establish a serial link to the Arduino. Arduino and Visual Studio It happens that my developing skills are quite limited to C# and when I had to develop some Kinect software with Processing in early 2012, I almost freaked out. Arduino code is written in C++  and the standard Arduino IDE is derived from the Processing IDE. Fortunately there’s the Visual Studio extension…

C#, Root, UI, Windows Phone

A Custom (Async) MessageBox for WPF and Windows Phone

The System.Windows.MessageBox provided by .NET is limited to a very small set of MessageBoxButtons (Yes/No/OK/Cancel) which do not allow for custom Button texts. The System.Windows.Forms.MessageBox also blocks the UI thread, which can be an annoying disadvantage as well. The MessageBox on Windows Phone has the same disadvantages. Custom buttons in a MessageBoxe simplify the decision for the user, because they can describe the results of the action: However you need to do this with a custom control, so for WPF as well as Windows Phone I designed a simple method for asynchronously showing a MessageBox with custom buttons. (The WPF implementation based on this control by Evan Wondrasek) So let’s bring some sample code.In WPF you can use multiple custom buttons: And on Windows Phone you’re limited to 2 buttons: To use CustomMessageBox, you need to get TCD.Controls from NuGet: And on Windows Phone 7.x you also need async support,…

C#, Metro, Windows 8, WinRT

In-App Donations for Windows 8 Apps

Recently I wanted to offer my customers the opportunity to donate some money. No extra features, just a clean donation option. In-app purchases seemed to be the best option. The idea is to have a list of products which have a price and contain “donate” in their product ID (Fig. 1). In the app the list of products can be retrieved and shown when a donate button is tapped. If donations have been given can be checked by enumerating the existing licenses and looking for the “donate” term (Fig. 2). Reasonably simple right? Well the principle is simple, but in-app purchases are a bit tricky to develop, debug and get through certification. (It took me 7 submissions to get it right..) Those are the things that can result in certification failure: no internet connection -> exception store does not respond properly -> exception error message looks to much like a…

C#, Root, UI, Windows 8, WinRT

Localizing Enums (in a ComboBox)

Enums have many useful applications and are often used in CoboBoxes to let the user select things. In the code behind the enum values are often defined using more or less cryptic text, because neither spaces, special characters, or leading numbers can be used in enum values (for good reasons!). Therefor it is necessary to change the text to something more understandable (language-localized in some cases). One way to achieve this is to create the ComboBox items manually, but it’s much more comfortable to fill the ComboBox items directly with the enum values, because you can get/set the SelectedItem without converting it back and forth from/to the enum value. You can’t override the .ToString() method of the Enum type, so we have to come up with another solution. Just like any other control, the ComboBox uses a Template to create its items. We will replace the default template with one…

Bio, C#, Root

03 Der Needleman-Wunsch-Algorithmus

Einführung in die Bioinformatik Vorbereiten der Software Grundlagen der objektorientierten Programmierung Einfaches Codebeispiel – manipulieren eines strings Referenzieren einzelner Zeichen in einem string Generieren einer zufälligen Aminosäure-Sequenz Scoring von Alignments Prüfen auf Identität Bewerten von Mutationen – Substitution Matrix Bewerten eines Alignments Der Needleman-Wunsch-Algorithmus Die F-Matrix (abstrakt) Auswählen des Alignments (abstrakt) F-Matrix (Code) Auswählen des Alignments (Code) Die F-Matrix (abstrakt) Der Needleman-Wunsch-Algorithmus geht bei der Berechnung des idealen Alignements in zwei Schritten vor, um exponentiell skalierende Rechenzeit zu vermeiden. Zunächst wird die sogenannte F-Matrix berechnet, aus welcher anschließend das ideale Alignment zusammengesetzt wird. Zur Veranschaulichung alignen wir die Sequenzen GACFC und GCFHC. Jedes Feld in der Matrix (jede Zelle der Tabelle) beinhaltet einen Score. Diese Punktzahl ist jene, die auf dem Weg zur Berechnung des Feldes gesammelt wurde. Zur Berechnung einer Zelle sind immer die Felder links oben, oben und links notwendig: Unter den drei Feldern wird jenes gewählt, durch…

C#, Windows Phone

TCD.Web.NotiConn – communicate between handsets without a server

Two days ago, when I was cycling, suddenly I had the answer: Imagine you have two Windows Phone 7 devices and want to establish a two-way connection between them. For example to play a game of Tic-Tac-Toe. You can do this either with a server on the internet, that connects the clients with each other, or the multicast protocol on WiFi-networks. The same WiFi network may not always be available to both users, but you don’t want to set up a server either (maybe, because you’re only doing this for fun, or you don’t have the resources). The only way to send messages to a WP7 app via the internet is to use push notifications. But how do you exchange the channel addresses between the devices? One way is to use a QR code: Establish a push notification channel on both devices Encode the channel URI into a QR code…

C#, Kinect, UI, Windows 8

TCD.Kinect

EDIT: If you’re interested in Skeleton tracking and calculating 3D stuff, take a look at TCD.Mathematics too^^ EDIT: There’s a WPF application that I once wrote, featuring SkeletonPainter3D: Kinect Sword. There’s a Youtube video of it (http://youtu.be/2j6GCd4M1bA) and that’s the source code: http://dl.dropbox.com/u/7813771/Blog/CodeSamples/KinectSword.zip   Hello there, I’ve created another UserControl, this time for Kinect and .NET 4.5, which hopefully has the potential to save you a lot of time. It can be used to draw three-dimensional Skeletons and explore the virtual space around them in real-time. A picture may be more appropriate: The control can be constructed in XAML: xmlns:kinect=”clr-namespace:TCD.Kinect.Controls;assembly=TCD.Kinect.Controls” <kinect:SkeletonPainter3D x:Name=”painter” Background=”Black” IsAnaglyphEnabled=”False” CameraFieldOfView=”70″ CameraPosition=”0,0.5,-1″ CameraLookAt=”0,0,2″ /> And populated with Skeletons using painter.Draw(skeletons), where skeletons is an Skeleton[] from inside the SkeletonFrameReady event. You can either get the TCD.Kinect package from NuGet, or refer to the sample implementation: http://code.msdn.microsoft.com/Implementation-of-f175b025 Let me know if you have any questions or suggestions, and by the way: SkeletonPainter3D has an experimental…

C#, UI, Windows 8

Windows 8 TouchInjection with C#

The Windows 8 platform provides an API to inject touch events (WM_TOUCH..) via a C++ API. The API is relatively easy to use, but not available in C#, unless you do DllImport/PInvoke. I found this to be kind of tricky, but finally I succeeded to make a C# library that can be used to use the TouchInjection API from C#. You can find TCD.System.TouchInjection on NuGet, or have a look at the TouchInjection.cs file itself. You may notice that I renamed all the strucs, enums and classes to look nicer than their C++ counterparts. The IntelliSense descriptions are available for almost everything! (I got them from the documentation on msdn..) I’ve made a sample application for the MSDN Code Gallery as well. Here’s a small collection of useful resources regarding the TouchInjection API: C++ sample application C++ TouchInjection API walkthrough