interesting picture

deep learning course @ stanford: https://www.youtube.com/watch?v=PySo_6S4ZAg ml course by Andrew Ng: https://www.youtube.com/watch?v=PySo_6S4ZAg Both are for free, just enjoy it and take your time…

Attic 在wikipedia中译为“阁楼”。 近两年进入attic的apache项目有不少：sqoop，ambri… 什么时候项目会进入attic? PMC决定不在维护了，或者ASF建议PMC将项目移进attic。 新技术不断涌现，替代者的出现是这些项目逐渐成为历史的直接原因。例如sqoop被datax、flink或spark(seatunnel)数据集成平台、kafka connect所替代。 结语 花无百日红，软件项目的生命周期也一样。优胜劣汰，自然社会进化的亘古不变的规律。

低频用户冷启动需要考验算法模型的泛化能力。建模中容易产生马太效应。 何谓马太效应？摘自wiki media， 天之道，损有余而补不足。人之道，则不然，损不足以奉有余。 凡有的，还要加给他，叫他有余；凡没有的，连他所有的也要夺去。 强者愈强，弱者愈弱。

As you said in the last video of 《machine learning》, I hope we can use AI to build cool products and make a better life. Thank you Andrew ng.

Huh HUH is typically used as a slang word, with the meaning “I am Confused or Surprised” or “Do you Understand?”. 嗯哼？ Duh DUH is an ironic response to a question or statement, implying that the speaker is stupid or that the reply is obvious. 显而易见~ 废话~

做YARN做了N年了，也想着存算分离吧？关于HDFS的存储有联邦存储和异构存储策略等内容，存算分离又算一个。存算分离，活生生的例子是KAFKA与PULSA的变化。KAFKA历史悠久，体量大的公司要替换很难，另辟蹊径的是，使用不同服务使其兼容kafka的rpc协议。协议一直是这个问题的根源，要实现存算分离，就要实现相应服务的协议，S3由于体量巨大，一直都是协议标准之一，所以首当其冲。 数据湖，一般结合现有的object store服务，提供基础的存储服务。同理，对于CK等服务，在OSS上实现相应的协议GATEWAY即可替换CK的本地存储，如MINIO。 存算分离有没有性能问题？一方面比较考验的是网络IO，所以局域网需要有理想的网络环境，例如50GB以上带宽。另一方面性能很受本地服务的缓存机制的影响，是否每次请求都重新从OSS拉取一遍数据。对于数据服务类的情况。例如一次查询10GB级的大表，网络不好的话，带宽占用、网络抖动等问题就会出现，所以本地磁盘优先原则依然是适用。 存储操作本质上可以分为两大类：一个operation就是一个对象全量的操作，类似对象存储的put。另一个是append log，不断追加：可以像kafka一样append本地log，也可以用bookeeper做分布式log。 后续一起看看存储相关的底层原理：TODO

The Youth’s Companion, Feb.7 1889, p.73(Vol 62) JUST THE BOY WANTED, II IN THE LAW, by Judge Oliver Wendell Holmes (from Howe, Mark DeWolfe. Research materials relating to life of Oliver Wendell Holmes.) A boy who wants to succeed in the law will probably do so. An encouraging thought, as far as it goes. But […]

Source Link: https://www.happierhuman.com/live-consciously/ There are generally two groups of people as far as awareness is concerned. Those that are wired to think before acting… and those who inherently act impulsively. Pausing to collect your thoughts, and considering the consequences of your actions, are habits of conscious people. As you may imagine, there’s much more depth to practicing conscious living, and […]