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You mention arxiv.org but missed gitxiv.com, the next evolution of the "really really fast" development cycles in machine learning. Gitxiv is where you can find implementations of some of the papers on arxiv.org. It's the source code you wish came with the papers. Most implementations are done by third parties, but an increasing number are of high quality.
Из комментариев по ссылке -- http://highscalability.com/blog/2016/3/16/jeff-dean-on-large-scale-deep-learning-at-google.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+HighScalability+%28High+Scalability%29