Оба метода помогают выбрать оптимальное количество кластеров (k), но делают это по-разному:
— Основан на
— При увеличении количества кластеров
— Нужно найти точку, в которой снижение становится
— Минус: нахождение локтя
— Для каждой точки рассчитывается
— Средняя оценка по всем точкам показывает
— Позволяет интерпретировать
— Часто даёт
— Метод локтя
— Метод силуэта — более
Библиотека собеса по Data Science
BY Библиотека собеса по Data Science | вопросы с собеседований
Bitcoin is built on a distributed digital record called a blockchain. As the name implies, blockchain is a linked body of data, made up of units called blocks that contain information about each and every transaction, including date and time, total value, buyer and seller, and a unique identifying code for each exchange. Entries are strung together in chronological order, creating a digital chain of blocks. “Once a block is added to the blockchain, it becomes accessible to anyone who wishes to view it, acting as a public ledger of cryptocurrency transactions,” says Stacey Harris, consultant for Pelicoin, a network of cryptocurrency ATMs. Blockchain is decentralized, which means it’s not controlled by any one organization. “It’s like a Google Doc that anyone can work on,” says Buchi Okoro, CEO and co-founder of African cryptocurrency exchange Quidax. “Nobody owns it, but anyone who has a link can contribute to it. And as different people update it, your copy also gets updated.”
Telegram has made it easier for its users to communicate, as it has introduced a feature that allows more than 200,000 users in a group chat. However, if the users in a group chat move past 200,000, it changes into "Broadcast Group", but the feature comes with a restriction. Groups with close to 200k members can be converted to a Broadcast Group that allows unlimited members. Only admins can post in Broadcast Groups, but everyone can read along and participate in group Voice Chats," Telegram added.
Библиотека собеса по Data Science | вопросы с собеседований from ar