I will introduce you to the full tutorial on HTML5 with a demo on the algorithm of machine learning the video game Flappy Bird. The purpose of this experiment is to write an artificial intelligence controller based on neural networks and a genetic algorithm.

That is, we want to create an AI robot that can learn the optimal game in Flappy Bird. As a result, our little bird can safely fly through obstacles. In the best scenario, she will never die.

After reading the theory behind this project, you can download the source code at the end of this tutorial. All code is written in HTML5 using the <a title="Phaser Framework" href="http://phaser.io/"> phaser </a> framework. In addition, we used the Synaptic Neural Network library to implement a neural network so that it would not be created from scratch.
Demo
First, look at the demo to evaluate the algorithm in action:

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Run in full-screen mode
MeLavi 10 october 2017, 9:05

It has been four and a half years since I, using a freshly received invoice, wrote previous hubra with such a title. A great time for the gaming industry. Many new good games have appeared and recently I felt an urgent need to share knowledge about them with the general public.

Despite the danger that again there will be a dispute regarding the title, I decided to leave it as before, in order to preserve continuity. You can take it as "games for those who have the ability to program," or something like that. However, I believe that you are reading this post not for reasoning about semantics, so let's get to the point.
Infinifactory
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MeLavi 9 october 2017, 12:27

According to our rough estimate, based on 20 years of practice, earthwork can "lose" up to 50-60% of the budget. On reinforced concrete and finishing is exactly 30%. On the errors of re-registration in collisions, the cost of engineering increases by approximately 10%. It is for this simple reason, when the "evil customer" implements the BIM-model of the building, wild cries and groans begin on all sides.

BIM-control will now be on all state orders on a new standard, so the cries and groans will be especially epic.

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Here I see the trace of all systems, I can get an accurate estimate for each node: and when I move or add an object I will receive updates in all project and working documents at once.

What is a BIM model? This is a three-dimensional model of a building where all systems are docked and tied together in one single plan. We put an outlet in the room - in the general estimate there was a new outlet and the corresponding cable meter. The error of this model is 2%. On paper, usually take a stock of 15%, and the surplus of this stock is desperately "lost."

Let's show you better examples than I will tell.
MeLavi 9 october 2017, 8:45

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Everything should be stated as simply as possible, but not simpler.
 - Albert Einstein
To make the game entertaining and interesting, it is not necessary to make computer-controlled opponents smarter. In the end, the player must win. However, letting him win only because the manager of the opponents of AI is badly designed, is also unacceptable. Interest in the game can be increased if the mistakes made by the enemy are intentional. Carefully adjusting the mistakes of opponents, making them intentional, but believable, programmers will allow opponents to look smart and at the same time ensure the victory of the player. In addition, by monitoring AI systems and appropriately controlling them, you can turn situations in which opponents look silly into an interesting gameplay.

A common mistake in the development and implementation of AI systems in computer games is in too complex a design. The AI ​​developer can easily get carried away by creating an intelligent game character and losing sight of the ultimate goal, namely, creating an entertaining game. If a player has the illusion that a computer opponent is doing something clever, then it does not matter how the AI ​​(if any) creates this illusion. A sign of a good AI programmer is the ability to resist the temptation to add intelligence to where it is not needed, and to recognize situations in which more "cheap" and simple solutions are enough. Programming AI is often more like art than science. The ability to distinguish between moments in which cheap tricks are enough, and those where more complicated AI is required, is not easy. For example, a programmer, having full access to all structures of game data, can easily cheat by making the NPC omniscient. NPCs can know where the enemies are, where the weapons or ammunition lies, without seeing them. However, players often recognize such cheap stunts. Even if they can not determine the very nature of cheating, they may have a feeling that the behavior of the NPC is not like the natural.
MeLavi 29 september 2017, 12:02

image How does the JVM create new objects? What exactly happens when you write a new Object ()?
At conferences, it is periodically told that the allocation of objects uses the thread-local allocation buffer (TLABs): memory areas allocated exclusively to each thread, creating objects in which is very fast due to the lack of synchronization.
But how correctly to choose the size of TLAB'a? What to do if you need to allocate 10% of the size of TLAB'a, but only 9% is free? Can an object be allocated outside TLAB? When (if) is the allocated memory set to zero?
Having asked these questions and did not find all the answers, I decided to write an article to correct the situation.
Before reading it, it's useful to remember how some garbage collector works
MeLavi 28 september 2017, 8:23

The problem of most disputes about the problem of piracy is that in them "value" is estimated only in "monetary" dollars. Therefore, the problem is formulated like this: "When buying a game from us, the user spends money dollars. A pirated copy costs zero money dollars. So most people will pirate the game if they have a choice, so you need to stop them at any cost. "

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The dollar is famous for everyone.

This is the error, therefore, at least four currencies, and not one (monetary dollars) should be taken into account here.

I propose the following notation:


($ D) Monetary dollars
($ B) Temporary dollars
($ D) Headache paints [in the original Pain-in-the-butt-dollars]
($ Ч) Honesty Dollars

The player makes the choice to buy or spiratit game based on how much "each" service (and not product! ) costs in these four currencies, and also depending on the value for the player each of them.
MeLavi 27 september 2017, 13:23

Image: TED Conference , CC BY-NC 2.0

In April 2017 published an article Will Gornalla from the University of British Columbia and Ilya Strebulaeva Stanford called "We bring venture business assessments to reality." In it, scientists analyzed the estimates of more than hundreds of world-famous companies (including technological ones) with an estimate of one billion dollars or more (the so-called "unicorns").

It turned out that these estimates do not always correspond to reality and can be repeatedly overstated. We publish the main findings of this study.
MeLavi 27 september 2017, 9:19

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Presently, the distance learning system has been developing all the time. There is no longer a problem to get a good education remotely. Online learning has several advantages, such as learning at own pace, freedom and flexibility, accessibility, and social equality. The Web offers a variety of services to help gaining new knowledge.
MeLavi 7 december 2012, 21:46

A couple years ago, I worked together with Ken Thompson on the interactive graphics language that was developed by Gerard Holzman in Bell Labs. I was typing quicker, therefore, I sat at the keypad, and Ken stood behind me. We worked quickly and when the compiler gave out an error, I started reflexively digging in a problem, studying the call stack, program output and launching a debugger, and so on. But Ken simply was standing nearby and thinking, ignoring me and a code, which we just wrote. Soon I noticed regularity that Ken often understood the problem faster than me and was saying, “I know, what is going on”. Usually, he was right. I understood that Ken built the mental model of a code, and when something was broken, it was the error in this model. He was thinking of how this problem could arise, so he explained what was wrong with model, or where our code could mirror this model incorrectly.
MeLavi 29 october 2012, 22:03

Today, I would like to talk about Firefox add-ons for the web development that can extend the browser’s core functionality, because I believe that these add-ons are very important for any web developer and web designer.

Many of these add-ons you already know!

Let's start with the most popular and powerful a wed development tool:

1. Firebug

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MeLavi 26 july 2012, 16:43
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