But sometimes these books leave the impression that heartfelt desire and hard work alone will lead to improved performance—“Just keep working at it, and you’ll get there”—and this is wrong. The right sort of practice carried out over a sufficient period of time leads to improvement. Nothing else.

The effectiveness of training data depends primarily on how well it relates to the human defined meaning and how reasonably it represents real model usage. Practically, choices around Training Data have a huge impact on the ability to train a model effectively. Training Data makes sense when a set of conditions are true. For example, training data for a parking lot detection system may have very different views. If we create a training data set based on a top down view (see left side of Figure 1.2) and then attempt to use the image on the right we will get unexpected results. That’s why it’s important that the data we use to train a system closely matches the data our trained system would see in production.

According to the World Health Organization, 785 million people globally lack basic drinking-water services.2 That’s a little over 10 percent of the world’s population, and even two million Americans don’t have access to safe drinking water or basic plumbing.3 Do you have enough food to eat every day? More than 820 million people in the world were undernourished in 2018.4 No matter how much you hate your job, do you have even the slightest potential or ability to get another one? According to the Global Slavery Index, 40.3 million people were in modern-day slavery in 2016.5 They really don’t have the option to quit. Do you have a proper toilet at home? Around 60 percent of the world’s people (4.5 billion of them) don’t have a toilet that properly manages human waste.6 Do you have high-speed Internet at home? About three billion people aren’t even on the Internet.7 Even twenty-one million Americans lack broadband access.8

Choice architecture is not just about how websites are designed or how policies are implemented. It is not just about professionals and researchers. We are all designers every day, posing choices to our friends, colleagues, and families. My friend is also a decision designer when, instead of asking his three-year-old whether she is ready to go to bed, he asks if she prefers to fly into bed or bounce into bed. He reported that bedtime became much less stressful for everyone involved when he started presenting options instead of a yes-or-no choice.

Despite all the commercial success, the deleterious side of the business was obvious. Dye manufacturing gave rise to dangerous pollution. Factory workers toiled in poorly ventilated facilities, holding only thin cloths over their nose. Washing after work was never enforced, and, in the evenings, workers would walk home with their arms, neck, and face smeared with brilliant streaks of iridescent sheen.14 The toxins caused skin discoloration, blood in the urine, and convulsions. Bladder cancer, known as aniline tumor, was so common that local doctors described it as “the most noticeable occupational disease.”

The shift from a system in which the debt notes are convertible to a tangible asset (e.g., gold and silver) at a fixed rate to a fiat monetary system in which there is no such convertibility last happened in the US on the evening of August 15, 1971. As I mentioned earlier, I was watching on TV when President Nixon told the world that the dollar would no longer be tied to gold. I thought there would be pandemonium with stocks falling. Instead, they rose. Because I had never seen a devaluation before, I didn’t understand how it works.

In other words, using the market values of what one owns to measure one’s wealth gives an illusion of changes in wealth that don’t really exist. As far as understanding how the economic machine works, the important thing to understand is that money and credit are stimulative when they’re given out and depressing when they have to be paid back. That’s what normally makes money, credit, and economic growth so cyclical.

Generated black magic code will give us a hard time building on top when we try to adjust or extend it without knowing what it actually does.

With APIs, you pull data from the provider. But webhooks allow the provider to push data to you.

Hooks enable a drastically different way to build stateful components in React, which means that they also invalidate 1 a lot of the established patterns.

While hooks alone are useful, they become even more powerful with the ability to combine them into custom hook functions. By building your own hooks, you are able to extract React logic into reusable functions that can simply be imported into our components. The only caveat to hooks is that you must follow some basic rules.

The useRef() Hook isn’t just for DOM refs. The “ref” object is a generic container whose current property is mutable and can hold any value, similar to an instance property on a class.

Portals provide a first-class way to render children into a DOM node that exists outside the DOM hierarchy of the parent component.

Where this gets even more powerful is the ability to create custom hooks that use useStaticQuery in them. Let’s say you need to query for the site title several times in your app. Instead of a call to useStaticQuery in each component, you can extract it out to a custom hook like:

Mocking and testing fetch with Jest

Add notify and you’ll get desktop notifications when the test runner finishes. If you have thousands of tests, they can take a while to finish. Just by adding this flag you’ll optimize your time.

Adding type annotations can take a little bit of additional type, but the benefits will undoubtedly pay off. Our code will be less prone to errors, it will be self-documented, and our team members will be much more productive because they will spend less time trying to understand the pre-existing code.

It seems that users prefer to use applications instead of mobile sites on smartphones, but at the same time, they are not eager to install apps from the stores. PWAs solve that problem.

Apollo link state is a way to combine your local state management with your remote state management. The approach assumes you are using Apollo, which allows you to use GraphQL over Rest. However, you do not need a GraphQL server in order to use this approach! – apollo-link-http allows you to write everything you need to adopt Apollo client side. This means that it's a viable all-in-one solution for state management (async and remote included), even if you aren't using GraphQL.

We knew we had to solve this problem, so we asked ourselves: What would it look like to manage state in Apollo Client? First, we thought about what we liked about Redux — features like its dev tools and binding state to components via connect. We also thought about some of our pain points with Redux, like its boilerplate and its do-it-yourself approach to core features like asynchronous action creators, caching, and optimistic UI.

Any ReactJS codebase should implement a UI-Library as soon as possible, even if it increases the development time in the beginning, it will be a huge win in the long run.

Please use Open Zeppelin smart contracts, they help to take the guesswork out of security issues with solidity and ensure that you are deploying a safe smart contract. It is not a silver bullet, but it will help you to develop more secure code.

What we need is actions and dispatchers to dynamically update the store. What if our dynamic store was just the state of a root React component?

First, using change detection only for updating the view state limits the number of places where the application model can be changed. In this example it can happen only in the `rateTalk` function. A watcher cannot "automagically" update it. This makes ensuring invariants easier, which makes code easier to troubleshoot and refactor.

Now that you have setup the library successful, you can use many algorithms of deep-learning in the start function after net = new convnetjs.Net();, and if you need something to run periodically then use the periodic function.

In order to ensure that happens, Webpack provides chunkhash. Chunkhash is based on the contents of each entry point rather than the entire build. Using that is just as easy:

In this article, I am going to give a quick overview about Node.js and then we will share 50 most recommended node.js framework which will help software developer to boost their skills.

This problem is a classic one with small to medium companies. The application that is being developed in the company has only unit tests (the base of the pyramid) and nothing else.

This means: Building an app that uses a pre-existing blockchain platform, i.e. Bitcoin, Ethereum, Hyperledger Fabric or similar. This approach is like creating an app that runs on a known operating system.

“Platform” (Type I DApp) This means: Building a new blockchain and token system, either from scratch or by forking existing blockchains. This approach is like creating your own operating system that other people will eventually build on. Real world examples of DApp I projects include Bitcoin, Ethereum and Hyperledger Fabric, all of which are blockchain platforms other developers can build on.

Platform (Type I DApp) Software (Type II DApp) Specialized Software (Type III DApp)

Startups are already shifting to a crowdfunded model while angel investors are bound to start buying ICOs instead of stocks.

Identity: An identity blockchain could confirm identities through crowdsourced consensus. With encrypted “proof of existence” biometrically tied to your DNA instead of an easily-compromised identification number, identity theft may become a thing of the past.

The process is beautifully democratic, determining what is true by consensus rather than a decision from one central authority.

Look at Bitcoin (which is built on blockchain) for an example: every time there’s a transaction, the blockchain network asks multiple computers (nodes) to approve transactions based upon their local blockchain. In order for the transaction to be approved, 51% of nodes have to be in agreement.

Blockchain is changing the way we do business, and it’s just getting started. If you’re looking to learn about blockchain and how to incorporate it into your industry, you’re in the right place.

IOTA is definitely worth checking out, even if you’re just curious about exploring a technology that’s even newer than Bitcoin or Ethereum.

Using a testnet. This is a private blockchain which runs on your host computer. The goal of a testnet is to debug your blockchain app code without spending real cryptocurrency.

Blockchain is powerfully more secure than traditional databases because it removes middlemen like banks, businesses and governments from the safety equation, replacing them with distributed nodes — computers in a blockchain network. Each node hosts its own copy of the blockchain database so it can participate in the blockchain peer-to-peer network.

It’s understandable that many blockchain discussions feature Bitcoin, but it’s just the tip of the iceberg for blockchain applications. Nearly any form of digital information can be stored in a blockchain, and almost any digital asset can be exchanged with a blockchain-based smart contract.

Instead of writing a contract in legal terms, imagine writing If-Then statements. This is the premise of a smart contract. Once the contract’s conditions are met, the blockchain automatically executes the autonomous “Smart Contract” for asset exchange. If you think this sounds a lot like Ethereum, you’re right.

If you’ve created an app, website or business, you’ve used a database. Remember: when we say “the blockchain”, we’re simply referring to a type of database — one that’s massive, decentralized, peer-to-peer and cryptographically secure. Apps are constantly making implementation choices based on security, performance and programming language constraints. When you base your application on blockchain, it’s really just another implementation choice. Developing an app on a blockchain will influence your programming language choice, app design and testing/debugging processes. In turn, you’ll receive transparency, security and automation (if you develop smart contracts). Although the blockchain community has grown significantly in the last several years, there still aren’t that many blockchain apps or developers. There’s tons of room for innovation and no better time to jump in on the blockchain revolution than now.

reuse some exisitng configuration files without necessarily understand how Webpack really works.

What makes Watson really great to me is its Natural Language Understanding and all the Watson Developer Cloud services are available in beta form, so they are free to use.

Throughout a lot of the case studies that Addy features, the heavy-hitters in building for better web experiences lied in link rel=preload, requestIdleCallback(), and HTTP2 Server Push. There were many mentions the PRPL pattern

What is interesting about opinion is that the more you know about a subject, the more opinionated you are likely to be. That can be a good thing. Show me a programmer who doesn't have opinions and I'll show you a programmer who is just doing what they've been told to do. Show me a programmer who has an opinion but can actually argue multiple sides of an argument and I'll show you a programmer who really knows his stuff. If you hold opinions so strongly that you are offended when someone disagrees with you, you have an issue.

In fact, you can compose those components with each others to make more advanced charts. That way, you benefit from already available reusable components. You can even break those advanced components in multiple reusable ones on your end.

If you write code at the peak of your mental capacity, then it will be harder for you to understand it later, not to even mention your colleagues who are not even familiar with the intricacies of the algorithm

PureComponent saves us time and helps us to avoid writing redundant code. It is important to understand the right ways to use it, otherwise its usefulness is voided. Since the PureComponent does shallow comparison, changes inside props or state will be ignored. For example, let's consider a situation where the parent component has a render method and a click handler:

The process of setting up Lambda that has been demonstrated in this article is very manual and somewhat ephemeral, but there are other ways to configure and initialize Lambda driven by the AWS API.

Ember tries to solve this with FastBoot. Backbone has Rendr. React has React Isomorphic.

Whether used on their own or combined together, the best thing about these two features is that they are the perfect progressive enhancement. If your user's browser doesn't support them, they will simply fall back to HTTP/1.1 without Service Workers. Your users may not experience as fast a load time as they would with these two techniques, but it would be no different from their normal experience. HTTP/2 Server Push and Service Workers are really the perfect partners when it comes to web performance.

By restraining the usage of context to be just a dependency injection system, instead of a state container, we can make context based libraries and shouldComponentUpdate behave both correctly without interference, without breaking the API's of consumers. And without requiring a better context implementation in React itself. Just stick to this simple rule:

On a related note, multitasking is a really bad idea. To be productive, developers need to focus on one thing at a time.

... props are a way of passing data from parent to child. ... State is reserved only for interactivity, that is, data that changes over time.

It's a shame that we're all still building custom solutions to this problem rather than collectively using something built into the browser. Users tend to learn the UX features of their browsers if they're exposed to them enough. We don't debate whether a user will have trouble inputting text into an <input>, or selecting an option from a <select>, because these are controls that the user sees in their browser of choice all the time.

To get to instant-loading, auto-upgrading experience, all you need to do is combine the laser-sharp leanness of AMPs with the richness of progressive web apps in one (or multiple) of the following ways: AMP as PWA When you can live with AMP's limitations. AMP to PWA When you want to smoothly transition between the two. AMP in PWA When you want to reuse AMPs as a data source for your PWA.

Let's say we have a page that's a simple form. Or simple form will have autocomplete, so we need to make queries. We need to submit the form so we will have a mutation. This same form will be used to allow users to edit the record, so we need multiple mutation queries in one componentX. One way to accomplish this is with compose, which takes multiple mutation queries and runs them simultaneously. You will need to name your queries.

This is really simple to use once you have React v15.4.0 in your project. We kindly copied the guide for Google Chrome from v15.4.0 release notes:

This is where babel-preset-env comes in: it's a Babel preset that automatically determines the correct Babel plugins to use based on the provided environments

make your own successful strategy to transform your technology stack quickly and successfully

automatically update links in a navigation list based on scroll position.

So as a developer you don't bother with complicated interactions. You just manage changes to the state in response to user or server changes. The UI then updates itself. And they all use a "virtual dom" for performance (use service workers) and to increase portability of rendering (server, client or even native mobile app). A CLI to simplify common tasks and facilitate recommended best-practices.

Use React for ephemeral state that doesn't matter to the app globally and doesn't mutate in complex ways.

Electron compiles desktop applications for Windows, Linux, and Mac. Meteor creates a full stack web application and potentially iOS and Android apps via Cordova.

React implements a browser-independent DOM system for performance and cross-browser compatibility. We took the opportunity to clean up a few rough edges in browser DOM implementations. In React, all DOM properties and attributes (including event handlers) should be camelCased. For example, the HTML attribute tabindex corresponds to the attribute tabIndex in React. The exception is aria-* and data-* attributes, which should be lowercased. So all DOM attributes and children prop are low-level props. High-level props - are custom props.

Use reverse proxy

One-way dataflow has proved "the way" forward, even Angular 1.x has it now to steer away from two-way bindings in components to help the migration.

Elasticsearch provides almost all its functionality through REST APIs and does not ship with a graphical user interface (GUI). While I cover how you can perform all the necessary operations through APIs and Node.js, there are several GUI tools that provide visual information about indices and data, and even some high level analytics.

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