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How to Write a Smart Contract with Python on Ontology? Part 4: Native API

Reading time4 min
Views1.7K
Cryptography*Python*DevOps*Distributed systems*Cryptocurrencies
Tutorial
image

Earlier, I have introduced the Ontology Smart Contract in
Part 1: Blockchain & Block API and
Part 2: Storage API
Part 3: Runtime API
Today, let’s talk about how to invoke an Ontology native smart contract through the Native API. One of the most typical functions of invoking native contract is asset transfer.
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Total votes 5: ↑5 and ↓0+5
Comments0

The science behind how our brains work best, and how technology and our environment can help

Reading time5 min
Views1.6K
Microsoft corporate blogMachine learning*Artificial IntelligenceBrain


You’re utterly focused. You’ve lost track of time. Nothing else in the world exists. You’re living in the moment.

While this might sound like meditation, it’s a description that can also be applied to the state of flow – the feeling of being so engaged by your work, that you lose yourself to it completely, while massively increasing your productivity in the process.

It’s the holy grail that we all strive for, whether it’s a hobby we’re passionate about, or a project at work. Achieving our best and utilising our maximum potential at all times, can however, be a struggle.
We had the pleasure of talking with Dr. Jack Lewis, a neuroscientist with a passion for exploring how our minds work, to see what motivates us to do our best work, and the important roles that workplace environments, culture, and technology can play.
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Total votes 4: ↑4 and ↓0+4
Comments1

How to Write a Smart Contract with Python on Ontology? Part 3: Runtime API

Reading time3 min
Views1.3K
Cryptography*Python*Programming*DevOps*Cryptocurrencies
Tutorial
image

Introduction


Earlier, I have introduced the Ontology Smart Contract in
Part 1: Blockchain & Block API and
Part 2: Storage API
Now when you have an idea about how to call the relevant API for persistent storage when developing Python smart contract on Ontology, let’s go on to Runtime API (Contract Execution API). The Runtime API has 8 related APIs that provide common interfaces for contract execution and help developers get, convert, and validate data. Here’s a brief description of these 8 APIs:
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Rating0
Comments0

How to Write a Smart Contract with Python on Ontology? Part 2: Storage API

Reading time3 min
Views1.3K
Python*Programming*DevOps*Distributed systems*Cryptocurrencies
Tutorial
image
This is an official tutorial published earlier on Ontology Medium blog
Excited to publish it for Habr readers. Feel free to ask any related questions and suggest a better format for tutorial materials

Foreword


Earlier, in Part 1, we introduced the Blockchain & Block API of Ontology’s smart contract. Today we will discuss how to use the second module: Storage API. The Storage API has five related APIs that enable addition, deletion, and changes to persistent storage in blockchain smart contracts. Here’s a brief description of the five APIs:
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Rating0
Comments0

Top 20 Marketplace Development Companies From All Over the World

Reading time6 min
Views4K
Website development*Development for e-commerce*Software
Considering ever-rising e-commerce sales, which hit $29 trillion last year, companies can no longer neglect online presence. Many of them have already changed the way they work and transformed from simple online stores to marketplaces bringing more sales and opportunities.

Those who’ve chosen the path of transformation or want to build a marketplace are probably seeking for experienced service providers to get some help.

Since there are hundreds of development companies all over the world, I decided to research the market and narrow down the circle of providers you might want to consider for partnership.

To compile this list the following factors were considered:

  • Overall number of customer reviews on such reputable platforms as Clutch, Upwork, GoodFirms, App Futura, Extract.co, IT Firms.
  • Overall score of those reviews.
  • Presence of Fortune 500 clients in the public domain.
  • Presence of industry awards in the public domain (e.g. Global Sourcing Award, Top B2B Global Leaders, Best of the Global Outsourcing 100).
  • Team size (bigger companies come first).
  • Year of fundation (mature companies have more trust).
  • Number of offices (more is better).
  • Number of brand mentions over the web (only companies with 1,500+ mentions are listed).

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Total votes 4: ↑3 and ↓1+2
Comments8

Dobroshrift

Reading time2 min
Views2.4K
Habr corporate blogAccessibility*DesignHealth
What one gets easily and for free can be a real struggle for others — these are the thoughts every letter of the «Dobroshrift» [Kindness Font] evolves. It was developed for the World Cerebral Palsy Day with the participation of children with this diagnosis. So we decided to take part in this charity action and changed the website logo till the end of the day.


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Total votes 17: ↑17 and ↓0+17
Comments0

More than a game: Mastering Mahjong with AI and machine learning

Reading time2 min
Views1.2K
Microsoft corporate blogMachine learning*Artificial IntelligenceLogic games


Microsoft researchers have developed an artificial intelligence (AI) system that has taught itself the intricacies of Mahjong and can now match the skills of some of the world’s top players.

The complex board game of chance, bluff, and strategy was invented in China thousands of years ago and remains a passionate pastime for millions of Asians today, with many dedicated competitors playing online.

Computers have learned to play Chess and another ancient Chinese game, Go, amid much fanfare in the past. But scientists at Microsoft Research (MSR) Asia see their achievement as far more than just a case of technology mastering yet another game.

The researchers – who named their system Super Phoenix, or Suphx for short – developed a series of AI algorithmic breakthroughs to navigate the uncertain nature of Mahjong. With more work, these could potentially be applied in real situations to solve problems thrown up by unknown factors and random events.
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Total votes 11: ↑11 and ↓0+11
Comments0

Celestia: Bugs' Adventures in Space

Reading time6 min
Views981
PVS-Studio corporate blogOpen source*C++*AstronauticsAstronomy
Picture 1

Celestia is a three-dimensional space simulator. Simulation of the space allows exploring our universe in three dimensions. Celestia is available on Windows, Linux and macOS. The project is very small and PVS-Studio detected few defects in it. Despite this fact, we'd like to pay attention to it, as it's a popular educational project and it will be rather useful to somehow improve it. By the way, this program is used in popular films, series and programs for showing space. This fact, in turns, raises requirements to the code quality.
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Total votes 27: ↑25 and ↓2+23
Comments0

What's new in ML.NET and Model Builder

Reading time2 min
Views979
Microsoft corporate blog.NET*Big Data*Machine learning*Artificial Intelligence
We are excited to announce updates to Model Builder and improvements in ML.NET. You can learn more in the «What’s new in ML.NET?.» session at .NET Conf.

ML.NET is an open-source and cross-platform machine learning framework (Windows, Linux, macOS) for .NET developers.

ML.NET offers Model Builder (a simple UI tool) and CLI to make it super easy to build custom ML Models using AutoML.

Using ML.NET, developers can leverage their existing tools and skillsets to develop and infuse custom AI into their applications by creating custom machine learning models for common scenarios like Sentiment Analysis, Recommendation, Image Classification and more!..

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Total votes 4: ↑4 and ↓0+4
Comments0

How to Write a Smart Contract with Python on Ontology? Part 1: the Blockchain & Block API

Reading time5 min
Views3K
Python*Distributed systems*Cryptocurrencies
From sandbox
image

This is an official tutorial published earlier on Ontology Medium blog
Excited to publish it for Habr readers. Feel free to ask any related questions and suggest a better format for tutorial materials

Foreword


In this article, we will begin to introduce the smart contract API of Ontology. The Ontology’s smart contract API is divided into 7 modules:


In this article, we will introduce the Blockchain & Block API, which is the most basic part of the Ontology smart contract system. The Blockchain API supports basic blockchain query operations, such as obtaining the current block height, whereas the Block API supports basic block query operations, such as querying the number of transactions for a given block.

Let’s get started!

First, create a new contract in SmartX and then follow the instructions below.

1. How to Use Blockchain API


References to smart contract functions are identical to Python’s references. Developers can introduce the appropriate functions as needed. For example, the following statement introduces GetHeight, the function to get the current block height, and GetHeader, the function to get the block header.
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Total votes 20: ↑18 and ↓2+16
Comments0

Geolocation and geoposition — mega-tool

Reading time5 min
Views2.6K
Maps API*API*Geoinformation services*SoftwareMicroservices*
Translation

Introduction


Today, geolocation and geo-positioning have turned into a state that we did not dream about 60 years ago, during the first thoughts about creating an Internet network.

This article was prepared thanks to the IPGeolocation.io

Cartography has turned into a miracle — from insanely large sheets of paper to what fits in the palm of your hand.

Today, maps are used not only to search for a cultural center in Paris, but to be able to find everything:

  • nearest hotel
  • pharmacy or hospital
  • grocery store
  • university or school
  • Pink Concert venue in San Francisco

The transformation of technology will not stop there. It will be better and more accurate than ever.

Evolution in time


Let's see how the evolution of geolocation began. The journey of this phenomenon begins in ancient times.

Excursion into the past
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Total votes 9: ↑8 and ↓1+7
Comments0

Top Software Development Companies for Enterprise & Startups

Reading time9 min
Views3.5K
Development of mobile applications*Development for Android*Start-up developmentOffices of IT companiesSoftware


Every day we hear about new budding software programs. With the rapid advances in the software development industry, new players entering the market and have captured a large segment of the market. So, when you need to track business projects, handle the allocation of assets, and solve other IT challenges, you need help from the top software development companies. However, it doesn’t mean that you should select a software development company on the basis of how appealing it was once. Today, people prefer to check the full profile of a company first and then decide to get their service.

To ease your pressure down, listing here some of the internationally acclaimed software development companies from the development niche. This list has been curated on the basis of a variety of reliable resources like Clutch, GoodFirms, Google SERPs, user's feedback & reviews, different independent review firms including medium.com, themanifest.com, etc. Based on the collected data, I’ve assigned the total score for each of the 10 leaders, and here I represent a list of the top software development companies that are doing best in their domain.

List of the Top Software Development Companies


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Total votes 10: ↑8 and ↓2+6
Comments1

How we made landmark recognition in Cloud Mail.ru, and why

Reading time11 min
Views2.4K
VK corporate blogAlgorithms*Image processing*Machine learning*Artificial Intelligence


With the advent of mobile phones with high-quality cameras, we started making more and more pictures and videos of bright and memorable moments in our lives. Many of us have photo archives that extend back over decades and comprise thousands of pictures which makes them increasingly difficult to navigate through. Just remember how long it took to find a picture of interest just a few years ago.

One of Mail.ru Cloud’s objectives is to provide the handiest means for accessing and searching your own photo and video archives. For this purpose, we at Mail.ru Computer Vision Team have created and implemented systems for smart image processing: search by object, by scene, by face, etc. Another spectacular technology is landmark recognition. Today, I am going to tell you how we made this a reality using Deep Learning.
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Total votes 45: ↑44 and ↓1+43
Comments0

Make it easier to get finished: Interview with John Romero, developer of Doom

Reading time12 min
Views5.8K
RUVDS.com corporate blogProgramming*Game development*Game design*Interview
At the last Tech Train IT festival, we met the legendary John Romero, who designed and developed the iconic Wolfenstein 3D, Doom, and Quake. We talked about whether game developers need soft skills, which working tools to pay attention to, and which co-founder of Id Software's favorite toys are. Questions were asked by Nikita Tsaplin, the founder of RUVDS.


→ Text and video in Russian
Total votes 26: ↑25 and ↓1+24
Comments0

Bypassing LinkedIn Search Limit by Playing With API

Reading time7 min
Views16K
JavaScript*API*Reverse engineering*Data storage*Social networks and communities
Translation
[Because my extension got a lot of attention from the foreign audience, I translated my original article into English].

Limit


Being a top-rated professional network, LinkedIn, unfortunately, for free accounts, has such a limitation as Commercial Use Limit (CUL). Most likely, you, same as me until recently, have never encountered and never heard about this thing.

image

The point of the CUL is that when you search people outside your connections/network too often, your search results will be limited with only 3 profiles showing instead of 1000 (100 pages with 10 profiles per page by default). How ‘often’ is measured nobody knows, there are no precise metrics; the algorithm decides it based on your actions – how frequently you’ve been searching and how many connections you’ve been adding. The free CUL resets at midnight PST on the 1st of each calendar month, and you get your 1000 search results again, for who knows how long. Of course, Premium accounts have no such limit in place.

However, not so long ago, I’ve started messing around with LinkedIn search for some pet-project, and suddenly got stuck with this CUL. Obviously, I didn’t like it that much; after all, I haven’t been using the search for any commercial purposes. So, my first thought was to explore this limit and try to bypass it.

[Important clarification — all source materials in this article are presented solely for informational and educational purposes. The author doesn't encourage their use for commercial purposes.]
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Total votes 10: ↑9 and ↓1+8
Comments3

Important Things to Know About Tensorflow 2.0

Reading time5 min
Views3K
Open source*Development of mobile applications*Machine learning*Mobile applications design*Artificial Intelligence


Deep Learning applications have changed a lot of things. Some which give hope for a brighter future, and some which raise suspicions. However, for developers, the growth of deep learning applications has made them more perplexed about choosing the best among so many deep learning frameworks out there.

TensorFlow is one of the deep learning frameworks that comes in mind. It is arguably the most popular deep learning framework out there. Nothing justifies the statement better than the fact that Tensorflow is used by the likes of Uber, Nvidia, Gmail among other big corporations for developing state-of-the-art deep learning applications.

But right now, I am on a quest to find whether it indeed is the best deep learning framework. Or perhaps find what makes it the best out of all other frameworks it competes against.
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Total votes 14: ↑11 and ↓3+8
Comments0

Modern Presentation Format?

Reading time7 min
Views3.2K
Interfaces*Usability*Presentations
Translation

Nowadays, when VR helmets have become part of our reality and Tesla cars fly in space, you can use all the power of browser engines to create truly interactive, cross-platform and stylish presentations, rather than make a set of PPTX pages or, even worse, a PDF document in "illustrative material for explanatory and calculation report" style.



Since 2015, I have been trying to find the optimal presentation format for myself (apart from graduation projects). And now I think I have almost succeeded. It all started with PowerPoint, and ended with web frameworks based on JavaScript.


There are several JavaScript engines which can be used to create cool presentations: Marp, Reveal, landslide, hacker-slides, slidify and others. In some engines, you can use Markdown, some are embedded in an IDE, and some have their own editors. I have tried the first two engines.


As a demonstration, slide examples and video are available.

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Total votes 9: ↑8 and ↓1+7
Comments0

How we created IoT system for managing solar energy usage

Reading time5 min
Views1.3K
System Analysis and Design*IT Infrastructure*Big Data*Smart HouseIOT

If you have no idea about the development architecture and mechanical/electrical design behind IoT solutions, they could seem like "having seemingly supernatural qualities or powers". For example, if you show a working IoT system to 18th century people, they'd think it's magic.This article is sort of busting such myth. Or, to put it more technically, about hints for fine-tuning the IoT development for an awesome project in solar energy management area.

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Total votes 9: ↑7 and ↓2+5
Comments0

TOP-23 Language Learning Apps

Reading time6 min
Views5.5K
Learning languages
There are hundreds of language learning apps and hundreds of reviews and comparisons. Actually most of the comparisons are about the same programs. Are the apps really helpful or this is only ad and marketing? Yes, and Yes.

I have been studying English using various methods and resources over five years. Language learning is not my greatest talent but I have achieved B2 level (from A2) using only my smartphone and PC. I found a set of features that really helps you study a foreign language. Some of them are crucial, others are just useful. Under the cut you will find a rating of the language learning apps that I composed by analyzing these features, As Objective As Possible.
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Total votes 10: ↑9 and ↓1+8
Comments13
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