Structural design patterns are concerned with how classes and objects can be composed, to form larger structures. They enable you to create systems without rewriting or customizing the code because these patterns provide the system with enhanced reusability and robust functionality.
Each pattern describes a problem which occurs over and over again in our environment, and then describes the core of the solution to that problem, in such a way that you can use this solution a million times over, without ever doing it the same way twice. —Christopher Alexander
There are following 10 types of structural design patterns.
Thanks to the quick advance in technology, especially in computer science and electronics. Nowadays, facial recognition is becoming the second most largely deployed biometric authentication method at the world level in terms of market quota right after fingerprints. Each day more and more manufacturers are including face recognition in their products, such as Apple with its Face-ID technology, the banks with the implementation of eKYC solutions for the onboarding process.
Contrary to the main aim of research in face recognition has been given to the improvement of the performance at the verification and identification tasks, the security vulnerabilities of face recognition systems have been much less studied in the past, and only over the recent few years, some attention has been given to detecting different types of attacks consists of detecting whether a biometric trait comes from a living person or it is a fake. …
Biometric has been for long the target of future authentication that expected that biometric authentication will largely displace other means of our current authentication and access control. Biometric systems can be used in two distinct modes as follows.
There is one theorem in computer science called the CAP theorem states that it is impossible for a distributed data store to simultaneously provide more than two out of the following three guarantees.
In 2011, Nathan Marz proposed an important approach to tackling the limitations of the CAP theorem in his blog¹, it called the Lambda architecture. …
An architectural pattern is a general, reusable solution to a commonly occurring problem in software architecture within a given context.
A pattern is a solution to a problem in a context.
Many programmers are nowadays still confused about the difference between architecture patterns or don’t even know much about it.
Let me explain to you…!
The most common architecture pattern is the layered architecture or known as the n-tier architecture. It is widely known by most software architects, designers, developers. Although, there are no specific restrictions in terms of the number and type of layers that must exist, most layered architecture consists of four tiers: presentation, business, persistence and database as follows. …
There are the following six steps to determine what object does the image contains?
Install TensorFlow and Keras.
pip install tensorflow
First of all, we set up the environment.
# TensorFlow and tf.kerasimport tensorflow as tf
from tensorflow.keras.applications.resnet50 import preprocess_input, decode_predictions
from tensorflow.keras.preprocessing import image# Helper libraries
import numpy as np
import matplotlib.pyplot as plprint(tf.__version__)
Then, we load and try to display the image that we want to predict. …
Nowadays we have many options when it comes to architecture design patterns. After developing many apps using Model-View- ViewModel (MVVM), Model-View-Presenter (MVP), and Model-View-Controller (MVC), I finally feel qualified to talk about the differences between them. For easier to understand, we can use a simple example like developing a screen to search books in the BookSearch App.
Let’s begin now…!
First of all, we need to understand briefly MVC, MVP, and MVVM architecture before dive into them.
The aim of these architectures is to separate the responsibilities of visualizing, processing, and data management for UI applications.
Their goals are to increase. …
Recursion is a problem-solving technique, where the solution of a larger problem is defined in terms of smaller instances of itself. You can try to imagine an example in the real world when you’re digging through your home and come across a mysteriously locked suitcase, the key for the suitcase is probably in this other box. This box contains more boxes, with more boxes inside those boxes. The key is in a box somewhere.
There are two popular approaches for us to solve this problem.
In this solution, we use a while-loop algorithm: “while the pile isn’t empty, grab a box, and look through it.” …
Choosing a development tool based on its popularity isn’t a bad idea. Popular tools are usually more stable, and they often have more resources and community support than less popular tools. Today, I’ll introduce categories of tools and lots of names of specific tools.
Let’s start now…!
A transpiler is a tool that compiles source code to source code. There are two transpilers that are popular in the community as follows.
In recent years, all over the world people always publish their documents and information on the Internet. As a result, there is an existing large amount of information on the Web including both useful and unuseful. So how we found these things quickly?
Let’s follow my guides…!
Google search operators are special characters and commands that extend the capabilities of regular text searches.
“phrase” => results must include “phrase”
-phraseexclude => results with phrase
phrase1 AND phrase2 => phrase1 and phrase2 must both be included phrase1 OR phrase2 => one of phrase1 and phrase2 must be included site:example.com => results must be on domain example.com …