[kzvezdarov]

I think in the TensorFlow case it is just a purely technical decision - I don't see how they could achieve what they aim for with that project in Go (or really, in anything but C/C++ at this point in time). Right tool for the job, etc.

[GrandTheftR]

+1 for right tool for the job. Also, I can imagine they have large amount code already there in C/C++ since this is the second deep learning system they designed.

and if you watch Jeff Dean's video, he mentioned more front end in other languages, Go is the only example and as the interest from internal.