AI guru Andrew Ng wrote, "We're lucky the AI community is very open, and top researchers freely share many ideas and even code. This helps the whole field progress. Hope we can keep it that way."
https://www.facebook.com/andrew.ng.96/posts/1140998245956081

I can't help but add that sharing data is a big missing piece. Some data is only available at some large companies. Even when data is available in more than a few places, labeled data usable as a consistent and accurate ground truth is very expensive to generate. This has long been a problem in recommendation systems, for example, where great data is only available in big companies, not at universities. It seems to be a problem right now for deep learning as well.
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