分享一篇介绍 Data Leak 的文章，说起 data leak 我早期是真的深受其害，毕竟真实世界的线上业务永远有一个特别的维度：时间。理论上完全服从独立同分布业务数据/问题并不多，所以很多时候我们是直接把时间维度忽略掉。若干年前参加过知乎的一次给短文本预测 tag 的竞赛最后也是因为当时原始数据存在一些 data leak（知乎作为举办方提供数据的时候把时间轴抹掉，但是数据本身又其实是时间排序的），最后的排名引起挺大的争议。对于 data leak 系统地考虑是线上数据科学工作非常重要的一环。https://towardsdatascience.com/data-science-mistakes-to-avoid-data-leakage-e447f88aae1c
BY Data Science Archive
Telegram today rolling out an update which brings with it several new features.The update also adds interactive emoji. When you send one of the select animated emoji in chat, you can now tap on it to initiate a full screen animation. The update also adds interactive emoji. When you send one of the select animated emoji in chat, you can now tap on it to initiate a full screen animation. This is then visible to you or anyone else who's also present in chat at the moment. The animations are also accompanied by vibrations. This is then visible to you or anyone else who's also present in chat at the moment. The animations are also accompanied by vibrations.
Most people buy Bitcoin via exchanges, such as Coinbase. Exchanges allow you to buy, sell and hold cryptocurrency, and setting up an account is similar to opening a brokerage account—you’ll need to verify your identity and provide some kind of funding source, such as a bank account or debit card. Major exchanges include Coinbase, Kraken, and Gemini. You can also buy Bitcoin at a broker like Robinhood. Regardless of where you buy your Bitcoin, you’ll need a digital wallet in which to store it. This might be what’s called a hot wallet or a cold wallet. A hot wallet (also called an online wallet) is stored by an exchange or a provider in the cloud. Providers of online wallets include Exodus, Electrum and Mycelium. A cold wallet (or mobile wallet) is an offline device used to store Bitcoin and is not connected to the Internet. Some mobile wallet options include Trezor and Ledger.
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