Articles – Mukeka & Tech

Linear Regression with PyTorch

machine-learning

Explains essential concepts to build a linear regression with PyTorch with a simple example

Humberto C Marchezi

Pygame Course for Teens

programming

kids

games

Describes how to efficiently play game sound track with MSX1

Humberto C Marchezi

How to Produce Music Tunes in MSX1

retro-computing

MSX

Describes how to efficiently play game sound track with MSX1

Humberto C Marchezi

How Graphic 1 Mode Works in MSX1

retro-computing

MSX

Describes an approach to efficiently display game graphics in a MSX1 computer

Humberto C Marchezi

Vector Space for Documents

machine-learning

Why and how to use vector to extract information from documents

Humberto C Marchezi

Text Classification with Logistic Regression

machine-learning

Text classification with logistic regression

Humberto C Marchezi

Text Classification with Naive Baye’s

machine-learning

Improved techniques to implement Naive Bayes for text classification such as Laplacian Smoothing and Log Likelihood

Humberto C Marchezi

Welcome To My Blog

news

After a very long winter to share ideas and thought in the tech and research area, I decided to be back with a shiny and practical bloging tool.

Humberto C Marchezi

Anomaly Detection in Seasonal Time Series

machine-learning

timeseries

anomaly-detection

Anomalies are data points that are very different from the vast majority of the other data that is being analysed. Anomaly detection is the class of algorithms responsible…

Humberto C Marchezi

NLP Fundamentals with Python

machine-learning

Fundamental NLP tools for python

Humberto C Marchezi

Express business language in your code with use cases

software-engineering

Use cases are a very important element in UML that addresses the functional aspect of a software. The use case diagram shows how the different system functionalities are…

Humberto C Marchezi

From static-language style API to Ruby style API

software-engineering

It has passed some time since I published a Naive_Bayes for text-classifier written in Ruby. At that time the API was designed very much influenced in way I have written a…

Humberto C Marchezi

Efficient Unit Test in C#.NET

software-engineering

I consider unit tests one of the most important practices in agile programming.
As the name stated, unit tests check the behaviour of the smaller part of an object what can…

Humberto C Marchezi

Writing Unit Tests with Google Testing Framework

software-engineering

There are several types of tests that differ in scope and intention:

Humberto C Marchezi

Create an Agnostic Vendor Infrastructure in Ruby

software-engineering

Depending how the code was written adding new services to it can be difficult.
For instance, let’s say we are building a rails application that gets integrated to cloud…

Humberto C Marchezi

Rails: New Framework - Old Design Problems

software-engineering

I have been programming for Rails for about 2-3 years now. As I came from a C# background it was a bit awkward for me to see some design principles I took as good practices…

Humberto C Marchezi

RORM - Ruby Domain Objects with Persistence

software-engineering

After some time using ActiveRecord and MongoId, I decided it was time to create a ruby ORM for domain objects as my first github project.
https://github.com/hcmarchezi/rorm/b…

Humberto C Marchezi

Separated Interface Design Pattern

software-engineering

When developing a system in many cases it is possible to identify dependencies among different layers whose responsibilities are well defined in the system.

Humberto C Marchezi

JavaScript: Object Oriented Programming

software-engineering

By using functions and the structures above it is possible to a function object which syntax works just like a C++/Java class. See examples below.

Humberto C Marchezi

Publishing ClickOnce winforms applications with command-line MSBuild

software-engineering

One of the most interesting characteristics of tools such as CCNet and Nant is the automated deploy. I found many examples of how to publish an application with…

Humberto C Marchezi

iPhone Development: to Objective-C or not to Objective-C ?

software-engineering

When I think of Objective-C, what comes to my mind is a niche programming language for the MacOS and Apple related products. Thus as far as I know this is the only…

Humberto C Marchezi

Tools and Utilities for the .NET Developer

software-engineering

Here is a list I got from the internet that might be useful (at least for a while):

Humberto C Marchezi

Using Fluent Builder Pattern to Configure Test Objects

software-engineering

Depending on the complexity of the domain model, configuring mock objects for specific cenarios can make the resulting test code to get messy.

Humberto C Marchezi

Test-Driven-Development Best Practices

software-engineering

I recently read a very intersting conversation in StackOverflow.com about test-driven development which I found very insteresting.

Humberto C Marchezi

Name Convention for Object Oriented Apps

software-engineering

Some time ago I came across with a question about naming conventions for different parts of the software: UI, Service, Entities, etc. I decided to share some of the…

Humberto C Marchezi

Unit Testing Linq Queries in Moq

software-engineering

After some google research and experimentation I found that it was not worth to mock methods that return IQueryable or IQueryable because in order to use it programmers have…

Humberto C Marchezi

Model View Controller with Events in .NET

software-engineering

This is often a confused design pattern and its main purpose is to separate objects that assume different roles in a software.
These roles are:

Humberto C Marchezi

Extreme Programming Impressions

software-engineering

Whe I first read about XP Programming in 2002 ( http://www.extremeprogramming.org/ ) which is one of the agile methodologies for software development I didn’t take it…

Humberto C Marchezi

DynamicProxy: An Elegant Solution for Session/Transaction/Exception Management in NHibernate (or any other ORM)

software-engineering

Session management is a well solved problem for web applications and many detailed solutions can be found in the internet. The same is not true for winforms applications.…

Humberto C Marchezi

Avoid ‘Tall’ DAO Factories

software-engineering

A “tall” DAO factory can be defined as a big class that contains too much methods for each business class that compounds your domain model.

Humberto C Marchezi

Agile Modeling in Software Projects

software-engineering

Recently Jeff Sutherland mentioned another certification for software programmers since Scrum does not include software engineer techniques but very present in XP (extreme…

Humberto C Marchezi

How the repository pattern works ?

software-engineering

The classes that represent the elements of a domain must contain all the business logic inside it such as tax calculation, name validation, etc. However in many…

Humberto C Marchezi

.NET: Using Generics to avoid repetition in Domain Classes

software-engineering

In classical object oriented methodologies or new-old-ones such as Domain Driven Design, the domain layer classes have persistent methods that reference its correpondent…

Humberto C Marchezi

Using .NET Nullable Types with NHibernate 1.2

software-engineering

Originally, NHibernate 1.2 does not support nullable types from .NET such as DateTime?, int?, bool?, etc. but that can be solved by implementing specific NHibernate specific…

Humberto C Marchezi

Extremely Short Introduction for Ruby on Rails

software-engineering

This file contains brief descriptions of a Ruby on Rails project.

Humberto C Marchezi

Generating Software Documentation from Unit Tests

software-engineering

In the beginning of my career as a software developer I participated in two software projects with the traditional approach of document-first and code later. It didn’t take…

Humberto C Marchezi

Efficient Software Development Process with Open-Source Tools for .NET

software-engineering

When a software is been built, a series of characteristics must be pursuit in order to deliver a quality product during the development process:

Humberto C Marchezi

Scrum as a criteria for Venture Capital Groups

software-engineering

I just read a Foreword from Jeff Sutherland ( co-creator of Scrum ) from the book “Scrum and XP from the Trenches” where he comments how he chooses companies who really…

Humberto C Marchezi

5 Things You Should Remember about NHibernate

software-engineering

NHibernate is probably the most used ORM (object-relational mapping tool) for .NET applications and it is based in Hibernate the most used ORM in Java for years.
The…

Humberto C Marchezi

Unit Tests Rule Software Development

software-engineering

Even after a relatively long time using object oriented systems we still couldn’t deal well with a growing problem. The lack of automated tests.

Humberto C Marchezi

Rich Domain Objects

software-engineering

In object oriented programming, domain objects are the key of the software development. However, many programmers tend to write these classes as simple get/set storage just…

Humberto C Marchezi

Best Practice to Handle Exceptions

software-engineering

Modern programming languages come with try/catch/finally blocks and many times an Exception Hierarchy of classes is provided also.
Exceptions are a powerful tool that can be…

Humberto C Marchezi

Choosing the Right Primary Keys

software-engineering

One of the most common data modeling is the use of composite keys and natural keys as primary keys to identify tables in the database.
Composite-key tables use more than one…

Humberto C Marchezi

Less is More - Dynamically typed languages

software-engineering

When I was in the university I learned that strongly typed languages should be preferred since they avoid the programmers from using a certain variable in way that it was…

Humberto C Marchezi

Packages: A Tool to Organize Classes

software-engineering

One of these days I was taking to a work colleague about what should be the package (a.k.a. Namespace) of a certain class. Not rare there is a small debate about it. Should…

Humberto C Marchezi

Why developers do not like to model the Real World ?

software-engineering

Years ago the concept of roles, real world modeling, reusability and many others were not known. People with different roles were modeled in different entities ( tables or…

Humberto C Marchezi

My First Big Enterprise System with NHibernate

software-engineering

We just finished to deliver our first big .NET system with a 4-Layered Architecture and domain objects. The proof-of-concepts is done also for big systems.

Humberto C Marchezi

Delphi for OO Programmers

software-engineering

I just came from a presentation about Borland products.
One of the speakers were showing a piece of Delphi code to explain his idea about object oriented programming and…

Humberto C Marchezi

OO Paradigm Popularity

software-engineering

As far as I know OO has existed since the 70’s. For a long time, OO was mainly used for academic projects. In the meantime relational databases gained popularity between…

Humberto C Marchezi