I have a 2015 macbookpro (OS X Yosemite) with a NVIDIA GeForce GT 750M card.
Installed the latest version of CUDA (8.0) and followed the directions from here:
Getting this error when attempting to use the GPU:
WARNING (theano.sandbox.cuda): CUDA is installed, but device gpu is not available (error: Unable to get the number of gpus available: CUDA driver version is insufficient for CUDA runtime version)
Problem: Installed the latest version of CUDA (8.0) when my driver required 7.5
Solution: Uninstalled 8.0 and then installed 7.5 (see #3 and #4 below), downloaded the proper version of cuDNN and copied the relevant files into the appropriate directories (under /usr/local/cuda), made sure my paths were set correctly in ~/.bash_profile … and voila.
Links to help others looking to develop locally on their OS X machines that aided me: