I've en­coun­tered the following problem quite a few times, so I decided to write about it here on my blog so I can find the solution faster.

When trying to build various open source libraries, especially ones that were initially made for Linux and then ported to Windows, sometimes the following error is received:

Unable to find vcvarsall.bat

This comes up because it tries to build it using Visual Studio and it looks.... for an older version of VS (I think).

The solution is simple. If you have VS2010, execute: SET VS90­COM­N­TOOLS=%VS100­COM­N­TOOL­S% at the command line and try again. If you have VS2012 run SET VS90­COM­N­TOOLS=%VS110­COM­N­TOOL­S%.

Via: Stack­Over­flow

Artificial Neural Networks are a math­e­mat­i­cal model, inspired by the brain, that is often used in machine learning. It was initially proposed in the '40s and there was some interest initially, but it waned soon due to the in­ef­fi­cient training algorithms used and the lack of computing power. More recently however they have started to be used again, especially since the in­tro­duc­tion of au­toen­coders, con­vo­lu­tion­al nets, dropout reg­u­lar­iza­tion and other techniques that improve their per­for­mance sig­nif­i­cant­ly.

Here I will present a simple multi-layer perceptron, im­ple­ment­ed in Python using numpy.

Neural networks are formed by neurons that are connected to each others and that send each other signals. If the number of …continue.

Recently, while working on a class project, I had a small problem with in­her­i­tance in Camelot, an excellent framework for rapid ap­pli­ca­tion de­vel­op­ment in Python.

In the ap­pli­ca­tion we needed to be able to define different kinds of projects, with similar needs, but which were each available only to some user groups. Single table in­her­i­tance sounds like a natural fit for this.

I couldn't find anything in the Camelot doc­u­men­ta­tion about this, but I figured that since it uses SQLAlchemy for its models, I could try the example given there:

 class Employee(Base):
    __tablename__ = 'employee'
    id = Column(Integer, primary_key=True)
    name 

Nu sunt Arthur sau Merlin, așa că nu voi vorbi despre orașul Camelot, ci despre frame­workul Python, care îi pretty much everything but the kitchen sink.

Cum tutorialul acesta este mai mult pentru colegii de grupă cu care lucrăm la proiect colectiv, voi presupune că este deja instalat Camelot.

Proiectul pe care îl vom crea este o mică chestie pe care eu vreau s-o fac de mai mult timp, și aceasta este opor­tu­ni­tatea perfectă: vom face un program cu care să pot urmări când se întâmplă anumite lucruri, în speranța ca mai încolo să pot extrage informații utile din când se întâmplă acele lucruri. Ce am de gând să măsor …continue.

Acest tutorial e mai mult pentru colegii de grupă cu care voi lucra la Proiect Colectiv

Prima parte am scris-o mai demult, dar nu îi bai, că nu s-o schimbat multe la Git de atunci :)))

În prima parte am configurat Git-ul, am creat un proiect nou, cu un fișier .gitignore și am făcut primul commit. În cei doi ani care au trecut de atunci ne-am dat seama că la primul commit am greșit două chestii: mai trebuia inclus fișierul config.txt și trebuia să dăm un mesaj de commit mai detaliat.

> git status
# On branch master
# Untracked files:
#   (use "git add ..." to include in what will