Where to install custom / portable programs in Windows10/8.x?

There are a couple of programs that cannot be installed / put into the regular locations (c:\Program Files and c:\Progam Files (x86)) as they cannot be run in non-administrator mode. So – where should you put / install those programs?

Fortunately Windows comes with a good place for those programs. Just put them into %LOCALAPPDATA%\Programs which expands to C:\Users\...\AppData\Local\Programs.
No need to tweak permissions (as it is in your user directory).

Downside: If you are part of a large domain (which you will not be with your private computer), your programs will not be synchronized to other computers where you log on. If you would like that you would have to place it in %appdata% (which expands to C:\Users\...\AppData\Roaming). But it would also mean that possibly large installations are synchronized. Don’t blame Windows if you are suffering from long login-times then!

In case you want to go deeper into the differences between Roaming, Local and LocalNow, have a look at the answers at superuser.com:

Roaming. (%appdata%) contains data that can move with your user profile from PC to PC – because data is synced with a server (e.g. web browser favorites or bookmarks.

Local. (%localappdata%) contains data that can’t move with your user profile. This data is typically specific to a PC or too large to sync with a server (e.g. temporary files).

LocalLow. (%appdata%/…/locallow) contains data that can’t move, but also has a lower level of access. E.g., a web browser in protected or safe mode, will only be able access data from the LocalLow Folder.

Mount vmWare shared folder in Ubuntu guest

If you want to share files between a Windows Host and a Ubuntu Linux guest, the “shared folder” feature is really handy. Just enable it in the VM-Settings, install guest additions and … then wonder where this shows up in the VM. “They appear under /mnt/hgfs” I read everywhere.

Well, they do – as soon as you do a

sudo mount.vmhgfs .host:/ /mnt/hgfs/

It took me a couple of minutes to figure this out as all tutorials endet with “the folder appears” …
If it doesn’t work, maybe just rerun

sudo vmware-config-tools.pl

How to fix: Windows 10 store fails to update or hangs during download / update

For a couple of days I saw some pending updates in my Windows 10 store that didn’t seem to install or download. The downloads were either in progress or done but none of them installed. Restarting the downloads didn’t help either.

Some quick research came up with all kinds of Powershell and registry hacks. Quite weird. Then I remembered about a recent issue that I had with Windows 8.1 which was solved by simply disconnecting the Microsoft account and reconnecting it after a restart. And it worked!

Dead easy

 

  • Go to account settings: Hit the Windows Key, type “Account” (german: Konto)
  • Disconnect from your Microsoft account
  • reboot (optional – I didn’t try without reboot)
  • Reconnect to the Microsoft account
  • Open the Store and do the update

 

Windows install error 0x80070002 unable to install App

Yesterday I tried to install a Windows App via its built in App Store. Usually this works like a charm. This time the download seemed to succees (judged by the progress bar) but the installation failed with error 0x80070002;

Googling (and Bing’ing) found various issues with kind of the same description, ranging from “download failed” to “broken registry” (including repair guides). Yet none of the proposed solutions worked for me.

Hoping it would just be a temporary failure on the store side, I hit “retry” again and again while I was searching for other solutions (interrupted by a reboot – well you never know, sometimes it just helps). And suddenly a message appeared saying that a Microsoft account was required to install the app. That was strange as I had just switched to a MS account this day – and this message appeared just once! When I wanted to reproduce it it just failed with 0x80070002 again.

So I disconnected my account from MS again, reconnected afterwards and suddenly: The installation succeeded!

To make a long story short

If you experience an error 0x80070002 when installing an App from the store in Windows 8.1: Try to disconnect and reconnect your account from and to a Microsoft account:

  • Win-C (open charms bar)
  • Go down to settings
  • Go down to PC settings
  • Go to Accounts >> your account
  • Disconnect your account
  • Repeat the above to reconnect to your MS account
  • Try to install the App

How to do automatic tagging of articles using Feedly

In this post I will describe a first proof of concept approach about how to implement a supervised learning system to automatically tag RSS posts in Feedly.

Motivation

Everyone using an RSS reader to read daily news surely knows the situation that certain topics keep (re)occuring in the news. Yet most people have topics that they are simply not interested in. Just think about certain sports, political topics or world events. But of course they keep showing up in the daily news stream.

Therefore a system is needed that automatically assigns predefined tags to the corresponding news entities and (maybe) also marks them as read.

A critical point is that the system must integrate into an RSS reader application. A system not being able to attach to an existing system would not be applicable as one still wants to use a mobile / desktop app to read the news and also to (un)tag articles. Implementing the complete value chain comprising fetching RSS, parsing, classifying, providing an aggregated stream AND an application for reading the news is definitely out of scope for a proof of concept.

I wanted to write such a classifier for quite some time but didn’t find a system that provided a convenient API to plug in  a tool for reading, classifying and pushing back the results. Unless I discovered the Feedly API. Unfortunately the Feedly API is not (yet) fully open, so that one has to obtain a time limited API token by hand. Yet, for a proof-of-concept, this is totally acceptable.

The Learning System

So much for the introduction. Let us go in medias res:

The first thought was to start with some clustering using Elasticsearch (for similarity search). But let’s recall the base facts and requirements:

  • Only a hand full of tags are needed
  • start with the simplest approach first
  • it should be able to run either on OpenShift or on my Raspberry Pi

So the choice was to start with a simple Naive Bayes Classifier. Instead of doing an in depth explanation of the Bayes classifier (I recommend Paul Graham’s A Plan for Spam and the page about combined probability), just recall: a Bayes Classifier is just a 0-1 classifier. So a single classifier is required for each tag. This makes it of course unusable for a very large amount of tags! But the big advantage is that the Bayes classifier is just dead easy. Just count how often a word occurs in the desired in class A (the Tag) and class B.

How to train / apply the classifier(s)

The classifier should be trained perdiodically and the user must have the opportunity to correct classification errors. Before dealing with synchronizing & updating entries, the classification workflow for each tag is:

  1. get all entities for the tag and use them as positive samples
  2. get all read and untagged entities and use them as negative samples
  3. get all unread and untagged entries and compute P(tag)
  4. if P(tag) > 0.95, mark the entity with the tag and probably also mark it as read

As input, the all kinds of properties are used that could distinguish between tags. Including the source URL, site keywords, categories etc. Then the content is tokenized / split by all non word characters. Graham writes about some optimizations for spam detection – yet results were pretty convincing without further optimization.

in order to have some positive samples, this of course requires the presence of some entities being tagged already. In this case I started tagging already quite some time ago as I already assumed that I needed some ground truth.

Raspberry PI: Boon and Bane

Raspberry PIs are great as little home servers. The drawback is that the RaspPi has just a single core, 700 MHz ARM CPU and 512 Mb ram which is shared between GPU and system. So, it is a bit slow and is a bit low on resources. Especially if the RasPi is also used for other purposes at the same time that also consume some RAM. In case of very large RSS streams, this could indeed raise a  problem: Running low on CPU is unconvenient (=slow), but running low on RAM is deadly (OOME). Therefore it might be required to replace the HashMap in the Bayes class with a DB layer like MapDB.

Status Quo

The quick test with the Bayes classifier showed already some really fine results! On the RasPi, each Tag is classified within 200 – 230s (14 – 18s on my notebook). The mission “Reduce the amount of information that I am not interested in” can thus be regarded as “successfully tested“!

Also there have hardly been any misclassifications. And the ones I experienced were quite understandable. In contrast to scientific publications I didn’t do extensive accuracy tests – the first attempts were so promising that I simply saved the time and thought about what to try out next that could make my life easier.

If this approach should be followed any further there are of course (as always) some open issues: Besides code cleaning, one could try to filter by TF-IDF, filter certain tokens, adjusting thresholds, etc. But I doupt that the results would get much better.

And of course, the complete code is available at GitHub. Feel free to fork it and play around with it! Beware: The code can change dramatically from one commit to another. For example if I just want to test a new idea.

How to rename a GIT tag

Once in a while (yet often enough) it happens that I have to change an already pushed git tag. Usually because I violated my own naming scheme.
Yet I also somehow can’t keep the necesserry commands in mind:

git tag newTag oldTag
git tag -d oldTag
git push origin :refs/tags/oldTag

Basically it is just: copy/link newTag to oldTag, remove oldTag, delete remote oldTag.
Also see the git man page for further parameters.

Windows Tomcat start failed command 127.0.0.1 could not be found

I just installed Tomcat 7 on my Windows machine and tried to fire it up through Netbeans. But instead of a running server, I just got an error message that command 127.0.0.1 could not be found (Localized error message: Der Befehl “127.0.0.1” ist entweder falsch geschrieben oder konnte nicht gefunden werden.).

I remember that I read about it in a Tomcat bugtracker (but can’t find it any more). Well the solution is pretty simple:
Just open [tomcat home]\bin\catalina.bat and remove the “-characters from lines 196 and 201 (in the code snippet below it’s line 1 and 6):

set JAVA_OPTS=%JAVA_OPTS% %LOGGING_CONFIG%

if not "%LOGGING_MANAGER%" == "" goto noJuliManager
set LOGGING_MANAGER=-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
:noJuliManager
set JAVA_OPTS=%JAVA_OPTS% %LOGGING_MANAGER%

Epson XP-205 Scanner in Windows 8.1 – How to get it back to work

Now it’s time for a Epson XP-205 Scanner to work with Windows 8.1

It took me a while now to get the XP-205 scanner component to run on my new Windows 8.1 via WiFi:

The problem is, that when you install the scan software, you might get a communication error telling you that the scanner is probably not connected or turned off. Both of course is not the problem.

So how you get it online in Windows 8.1:

  1. First install the Epson Scan software that you can obtain directly from epson (german version link).
  2. Open the scan software and verify that you (still) get the error.
  3. epson-scan-settings-1Then change to the Windows-Tile screen (just hit the Windows-Key on your keyboard) and type “Epson Scan”. A list should appear that shows the Epson Scan entries. One of them should be “Epson Scan Settings” (german: Epson Scan-Einstellungen).
  4. Now comes the tricky part:If you work as an administrator (which you shouldn’t do usually), just open the Epson Scan Settings tool. Otherwise right-click the Epson Scan Settings tool and start it with administrator privileges. This is very important! Otherwise you won’t be able to do the next step as an important part is greyed and thus unavailable!
  5. You should see the settings window with “Connection local” selected.
  6. epson-scan-settings-2Hit the “Network” button and then hit the “add” button below the Networkscanner address field.
    If this button is disabled, you probably do not run the program with admin privileges.
  7. Add the Scanner’s IP and give it a name.
  8. Hit the Test button – it should work now!

epson-scan-settings-4The scan software should work now. I first had some issues that I also had to run it with admin privileges. Sometimes I could start the scanning software, showing the correct user interfacec but it only scanned a very tiny part of the physical scan area (VERY strange).

So if you still experience some issues: Try restarting the computer first! If this doesn’t work, try starting as administrator.

Update: The Scan software surprised me today with a message similar to  “ah no – I won’t scan today”. So I

  • uninstalled the scan software. Well I tried, the files were still in the windows directory.
  • let the Software updater update the firmware of the device
  • reinstalled Epson Scan

And – suddenly everything is just fine.

Fix Twitter share button in WordPress’ Huge-IT Share buttons

I just tried the Huge-IT share plugin for wordpress and realized that the twitter share button seems to have a bug: When sharing, the tweet will not link back to the URL. Not cool :-/

Fix:

changed the file (via edit plugin): wp-share-buttons/Front_end/share_front_end_view.php

case 'share_twitter_button':
 $link= 'https://twitter.com/intent/tweet?url=http%3A%2F%2F'.$linkthispage.'&text='.$str;

Now the URL is prepended with http and thus displayed in the twitter share-dialog as well. Mission accomplished.
(And Huge-IT is also informed about the bug + fix)

Have fun and a happy new year