Theano install warning: g++ not detected

Question

After I installed Theano I tried to run it but got following error message:

WARNING (theano.configdefaults): g++ not detected! Theano will be unable to execute 
optimized C-implementations (for both CPU and GPU) and will default to Python 
implementations. Performance will be severely degraded.

Why?

Answer 1

Try installing the g++ compiler.

Python is rather slow, so for performance-critical parts you need a compiled language such as C++.

Answer 2

You can try installing mingw (http://www.mingw.org/) as mentioned in the answer posted here - theano g++ not detected