I do find it curious that his list of "pretty standard machine-learning methods" included Logistic Regression, K-means and....deep neural nets? The next senten

I do find it curious that his list of "pretty standard machine-learning methods" included Logistic Regression, K-means and....deep neural nets? The next sentence is much more curious to me: "the point is that they’re widely available in high-quality open source packages" because I have yet to find a proper well documented well maintained non-toy open source deep neural network implementation.