Skyla  Feeney

Skyla Feeney

1595403060

Dart declaration-site variance

Declaration-site variance was my internship project on the Dart team, and I’ve documented my personal experience on the team in the article Life as a Dart intern. As the primary implementer of the declaration-site variance feature, I want to share the usages and benefits of sound variance.

We’ll discuss how to use variance, why we want to use the modifiers, how the feature can build on top of classes that don’t use the modifiers, and what benefits this feature provides us.

Note:_ The implementation of variance isn’t finished yet. Although you can play with it by enabling the experiment (instructions below), the feature might change before it’s finalized._

Before diving into Dart’s declaration-site variance feature, we’ll take a quick detour to discuss what variance means and how it’s used.

What is variance?

To briefly introduce variance, we can look at this example:

main() {
	  Iterable<Object> objectIterable = <int>[1, 2, 3];
	}

From this, an Iterable of integers can be substituted as an Iterable of Objects because an integer is an Object and can be used in an Iterable in every place an Object would be.

#variance #dartlang #programming

What is GEEK

Buddha Community

Dart declaration-site variance
Ahebwe  Oscar

Ahebwe Oscar

1623192840

Does My Site Work?

EPISODE SUMMARY

On this episode, we will discuss how you can verify that your site works and continues to work. We’re digging into automated testing and how to write tests for your Django apps.

Full show notes are available at https://www.mattlayman.com/django-riffs/13.

EPISODE NOTES

Full show notes are available at https://www.mattlayman.com/django-riffs/13.

#does my site work? #your site is #episode summary #episode notes #the site. #my site work

Ashley Troy

1618240774

Role of Professional Brand Consulters to Make Your Brand Successful

Each company wishes to remain present in the industry, and for that purpose, it indulges in user profile creation sites list to become popular in the online field. To achieve this, however, you need robust and productive strategies to maintain your existing customers’ loyalty. These plans should also attract new customers at precisely the same time.

Only the latest consulting firms are effective enough to observe the suitable approaches that can help you transform your business into your favourite brand. At Vowels Advertising in Dubai, Abu Dhabi, we offer various courses and suggestions to help your business and building to be effective by becoming a brand consultant. Branding advisers build new communication methods and a new identity. These advisers offer the brand of goods as required. They research your brand, which is made up of its identity and values. Brand Advisors have fantastic ideas and approaches to branding your products.

The most significant advantage of hiring a new consulting firm is that it has years of experience combined with the latest construction approaches. Since then, such companies are used to market trends and are continually being improved; they can quickly assess the competition and track competitor companies. In this way, they can analyze the manufacturer’s promotional requirements and evaluate the market to target a new product more effectively.

None of the other popular brands you see in the market today have started on a large scale right from the start. They achieved their present position thanks to ongoing trials and planned procedures. The whole long-term strategy was to introduce a new identity, place it precisely in the current market, and strengthen it by copying it to acceptable masses. Planning these elements and then implementing them appropriately is not a simple job. That is why companies from all over the world employ new consulting companies to implement the project.

If best, a new consulting firm can be tricky as there are an endless number of firms offering such services? The key to finding the perfect supplier for you is to analyze your condition first. As soon as you write down all the things, you can compare providers on the Internet and look for any gaps that may be useful to you. Also, start looking for reviews and connect with all previous customers to find out how satisfied they were with all the services.

By opting for Enterprises, they are responsible for creating the perfect brand identity for virtually any business, placing or repositioning it according to the market in which it operates, designing campaigns that advertise the business professionally and economically, and conducting thorough target market, competition, and market research. Thanks to all these activities, companies help to establish a small business and increase its visibility on the market. In the case of your small business, you can undoubtedly see it grow and reach a wider audience. You can find suitable new employees for a consulting company.

So this is how you can hire professional brand consulters to promote your brand amongst the customers effectively.

#profile creation sites #profile creation sites 2021 #profile creation sites list #high pr profile creation sites #free profile creation sites list #high da profile creation sites

Skyla  Feeney

Skyla Feeney

1595403060

Dart declaration-site variance

Declaration-site variance was my internship project on the Dart team, and I’ve documented my personal experience on the team in the article Life as a Dart intern. As the primary implementer of the declaration-site variance feature, I want to share the usages and benefits of sound variance.

We’ll discuss how to use variance, why we want to use the modifiers, how the feature can build on top of classes that don’t use the modifiers, and what benefits this feature provides us.

Note:_ The implementation of variance isn’t finished yet. Although you can play with it by enabling the experiment (instructions below), the feature might change before it’s finalized._

Before diving into Dart’s declaration-site variance feature, we’ll take a quick detour to discuss what variance means and how it’s used.

What is variance?

To briefly introduce variance, we can look at this example:

main() {
	  Iterable<Object> objectIterable = <int>[1, 2, 3];
	}

From this, an Iterable of integers can be substituted as an Iterable of Objects because an integer is an Object and can be used in an Iterable in every place an Object would be.

#variance #dartlang #programming

What is dART Insurance (dART) | What is dART Insurance token | What is dART token

In this article, we’ll discuss information about the dART Insurance project and dART token

About dART

dART is the first NFT insurance platform on the market, preparing to launch on Binance Smart Chain’s intuitive and highly active network. With NFTs generating hundreds of millions of dollars of monthly trading volume, we provide a way for users to protect their valuable digital assets, which can regularly surpass seven or eight-figure sums.

By innovating on the traditional insurance model and introducing bonus features through the use of blockchain technology, dART will be able to reward platform stakeholders while providing safe, verifiable, and straightforward insurance coverage to this rapidly expanding digital marketplace.

dART users will secure insurance for their assets directly from the dART terminal, and our solution will be integrated into the NFT marketplaces.

The ability to insure NFT assets will become easily accessible to all crypto users. As the value being held in NFTs continues to grow, the ability to protect against risks becomes essential. dART will be the first platform allowing its users to insure their NFT assets.

NFTs are rapidly expanding, growing from a relatively obscure market to generating hundreds of millions of dollars in monthly trading volume. With the NFT market’s continuous growth, already valued at approximately $250 million at the end of 2020, dART is introducing the first platform built to protect against exploitation and hacks of NFTs through the utilisation of a decentralised insurance protocol.

The NFT market has begun to cement itself as a major player within the cryptocurrency space, but not a single NFT platform has incorporated a risk coverage solution for its users. We will be the first platform to address this, providing everyone a safe and secure ownership experience.

Using Insurance to Protect Your NFTs

If you’re reading this, you’ve probably heard of Beeple’s $69 million NFT sale through Christie’s Auction House, CryptoPunks worth millions of dollars each, and the countless other art pieces and digital collectibles that are worth five, six, or seven-figure sums. Considering these rare and highly sought-after pieces command incredibly high prices, it doesn’t make sense to leave them unprotected and uninsured.

Regardless of the sector, whether it be art, real estate, sports cards, or something more niche, any intelligent investor should take out an insurance policy to limit their downside risk. This rings especially true for decentralized markets, as there is a lot less accountability available if a problem arises and there is no centralized party to help resolve it. This is where dART comes in, offering NFT owners peace of mind through our user-centric platform.

Why Do NFTs Need Protection?

NFT protection should be at the forefront of any investor, speculator, or collector’s mind. There is a famous idiom in the blockchain community, “not your keys, not your coins”, with this also remaining true for any tokenized digital asset.

Even NFT platforms that offer their users the ability to store NFTs on a non-native wallet like Metamask present major risks, as hot wallets connected to the internet always have potential vulnerabilities. In the event that the NFT storage platform is compromised, if you accidentally download a virus, or if you experience an exploitation resulting in the loss of your asset, you need risk coverage. dART provides straightforward options with the sole goal of financially empowering NFT owners, picking up the slack that NFT platforms are unwilling or unable to offer their user bases.

All-in-all, if you have any form of significant wealth tied up in NFTs, whether that be hundred, thousands, or millions of dollars, asset insurance is the only way to truly protect yourself in this decentralised economy. Many have made life-changing money through their NFT collections and investments; they are at risk of losing everything they’ve worked for with zero repercussions if they do not take the proper safety precautions. As NFTs continue to establish themselves as a true value-generating asset and store of wealth on par with traditional physical art and collectibles, dART provides the key to make sure they are safe, with their value always accessible to the owner regardless of circumstances.

dART Token

As non-fungible tokens (NFTs) continue to establish themselves within the mainstream and climb in value, users need to be more proactive in protecting their digital assets. This is especially true within a decentralised economy with little accountability; if something goes wrong in the current marketplace, there is not much that anyone can do to provide protection. With this problem in mind, we developed dART, the first platform that allows users to protect the monetary value of their NFTs perpetually.

To act as an incentivization and governance mechanism for our decentralised network, we have created the dART token, the native cryptocurrency for our NFT risk coverage platform. dART will act as the ‘gas’ that facilitates transactions on our network, allow users to vote on the future direction of the platform, and earn through staking. Combining this with the token’s pre-programmed and limited scarcity, dART could have a tremendous impact on the NFT industry.

Governance

Third-party insurance companies compose themselves to generate as much profit as possible, even if it’s at the expense of their users; at dART, we are taking a different approach. With a focus on creating a highly functional decentralised and distributed risk coverage network, we are collectively determining the future direction of the platform through our community, relying on democratic principles to guide us forward. All dART holders will have a say in direct proportion to their ownership stake in the network, allowing for a fair and equally representative decision-making process.

Staking and Earning Fees

Beyond governance, dART introduces passive income opportunities directly to token holders. Any user will be able to easily stake dART in liquidity pools, generating a high and reliable APY, as well as stake the LP tokens generated into our governance staking protocol. Through these implementations, we are enabling easy-to-access reward pools where anyone can earn staking and LP rewards in proportion to their share of the staking pool.

The staking of dART in liquidity pools allows us to provide discretionary risk coverage to NFT holders, forming a buffer against losses due to hacks or manipulations. While the tokens acting as insurance collateral are sitting idly in the pool, they will be distributed amongst dART defi partners, who will use the liquidity to generate yield for dART owners. This model mirrors how the traditional insurance ecosystem works, but instead of the profits lining the pockets of wealthy executives and shareholders, they are returned back to the users of the platform, rewarding them alongside the platform’s growth and success.

How and Where to Buy dART Insurance (dART)?

dART is now live on the Ethereum mainnet and Binance mainnet The token address for dART is 0x5a4623F305A8d7904ED68638AF3B4328678edDBF. Be cautious not to purchase any other token with a smart contract different from this one (as this can be easily faked). We strongly advise to be vigilant and stay safe throughout the launch. Don’t let the excitement get the best of you.

Just be sure you have enough ETH and BNB in your wallet to cover the transaction fees.

You will have to first buy one of the major cryptocurrencies, usually either Bitcoin (BTC), Ethereum (ETH), Tether (USDT), Binance (BNB)…

We will use Binance Exchange here as it is one of the largest crypto exchanges that accept fiat deposits.

Once you finished the KYC process. You will be asked to add a payment method. Here you can either choose to provide a credit/debit card or use a bank transfer, and buy one of the major cryptocurrencies, usually either Bitcoin (BTC), Ethereum (ETH), Tether (USDT), Binance (BNB)…

SIGN UP ON BINANCE

Step by Step Guide : What is Binance | How to Create an account on Binance (Updated 2021)

Next step

You need a wallet address to Connect to Uniswap Decentralized Exchange, we use Metamask wallet

If you don’t have a Metamask wallet, read this article and follow the steps

What is Metamask wallet | How to Create a wallet and Use

Next step

Connect Metamask wallet to Uniswap Decentralized Exchange and Buy dART token

Contract: 0x5a4623F305A8d7904ED68638AF3B4328678edDBF

Read more: What is Uniswap | Beginner’s Guide on How to Use Uniswap

There are a few popular crypto exchanges where they have decent daily trading volumes and a huge user base. This will ensure you will be able to sell your coins at any time and the fees will usually be lower. It is suggested that you also register on these exchanges since once dART gets listed there it will attract a large amount of trading volumes from the users there, that means you will be having some great trading opportunities!

Top exchanges for token-coin trading. Follow instructions and make unlimited money

https://www.binance.com
 ☞ https://www.bittrex.com
 ☞ https://www.poloniex.com
 ☞ https://www.bitfinex.com
 ☞ https://www.huobi.com

Find more information dART

WebsiteExplorerExplorer 2Social ChannelSocial Channel 2DocumentationCoinmarketcap

🔺DISCLAIMER: The Information in the post isn’t financial advice, is intended FOR GENERAL INFORMATION PURPOSES ONLY. Trading Cryptocurrency is VERY risky. Make sure you understand these risks and that you are responsible for what you do with your money.

🔥 If you’re a beginner. I believe the article below will be useful to you

⭐ ⭐ ⭐ What You Should Know Before Investing in Cryptocurrency - For Beginner ⭐ ⭐ ⭐

Thank for visiting and reading this article! Please don’t forget to leave a like, comment and share!

#blockchain #bitcoi #dart #dart insurance

How to measure the variance of a statistical model

This article assumes that you understand and know how to build regression or classification models.

The error of any statistical model is composed of three parts — bias, variance and noise. In layman’s terms, bias is the inverse of the accuracy of predictions. And variance refers to the degree to which the predictions are spread out. Noise, on the other hand, is random fluctuation that cannot be expressed systematically.

However, the above definitions are vague and we need to inspect them from a mathematical perspective. In this article, I will stress on variance — the more perplexing demon that haunts our models.

A short note on Variance

When we allow our models the flexibility to uselessly learn complex relationships over the training data, it loses the ability to generalize. Most of the times, this flexibility is provided through features i.e when the data has a large number of features (sometimes more than the number of observations). It could also be due to a complex neural network architecture or an excessively small training dataset.

What results from this is a model which also learns the noise in the training data; consequently, when we try to make predictions on unseen data, the model misfires.

_Variance is also responsible for the differences in predictions on the same observation in different “realizations” of the model. _We will use this point later to find an exact value for the variance.

Mathematical explanation

Let Xᵢ be the population of predictions made by model M on observation i. If we take a sample of size n values, the variance will be:

Image for post

Now that was something we already knew. However, we need to calculate the variance of the whole population (which is equivalent to the variance of the statistical model that generated it) and we are not quite there yet. There is one concept we need to understand before that — bootstrap resampling.

Note that this formula of variance assumes that the outcome of the model is a continuous variable — this happens in regression. In the case of classification, the outcome is 0/1 and thus, we would have to measure the variance differently. You can find the explanation to that in this paper.

Bootstrap Resampling

Often we don’t have access to an entire population to be able to calculate a statistic such as variance or mean. In such cases, we make use of bootstrap sub-samples.

The principle of bootstrapping suggests that if we take a large number of sub-samples of size n with replacement from a sample of size n, then it is an approximation of taking those samples from the original population.

We find the sample statistic on each of these sub-samples and take their mean to estimate the statistic with respect to the population. The number of sub-samples we take is only limited by time and space constraints; however, the more you take, the more accurate will be your result.

Realizations of a model

Let _M _be our statistical model. A realization of M is a mapping from input to output. When we train M on a particular input, we obtain a specific realization of the model. We can obtain more realizations by training the model on sub-samples from the input data.

#machine-learning #bias-variance #variance-analysis #variance #sensitivity-analysis #data analysis