[shoyer]

This is spot on. There are plenty of jobs applying open source technologies, but far fewer building those libraries themselves.

(I'm NumPy dev who works at Google on machine learning.)

[eximius]

Really? This is somewhat surprising to me. How has Grumpy impacted your work / numerical computing in Python at Google?

[shoyer]

I haven't used Grumpy at all, and unless it starts supporting C extension modules like NumPy I doubt I ever will. Google's numerical computing / machine learning stack (e.g., TensorFlow) is based on Python/C++.