TensorFlow: MacBook Pro: detect which CPU and GPU devices are available

from tensorflow.python.client import device_lib

def get_available_gpus():
    devices = device_lib.list_local_devices()
    #return [x.name for x in devices if x.device_type == 'CPU']
    return [x.name for x in devices ]

print(get_available_gpus())

['/cpu:0']

Currently, I can see and execute only on CPU.

MacBook Pro i7 Late 2013

Device 0: "GeForce GT 750M" CUDA Driver Version / 

Runtime Version 8.0 / 8.0 CUDA Capability Major/Minor version number: 3.0 

Total amount of global memory: 2048 MBytes (2147024896 bytes) 

( 2) Multiprocessors, 

(192) CUDA Cores/MP: 384 CUDA Cores GPU 

Max Clock rate: 926 MHz (0.93 GHz) 

Memory Clock rate: 2508 Mhz Memory Bus Width: 128-bit L2 

Cache Size: 262144 bytes

http://osxdaily.com/2017/01/08/disable-gpu-switching-macbook-pro/

Still not working with TensorFlow

start = timeit.timeit()
print ("starting")

with tf.device('/cpu:0'):
    # [1.0, 2.0, 3.0, 4.0, 5.0, 6.0]
    a = tf.constant([1.0, 2.0, 3.0, 4.0, 5.0, 6.0], shape=[2, 3], name='a')
    b = tf.constant([1.0, 2.0, 3.0, 4.0, 5.0, 6.0], shape=[3, 2], name='b')
    c = tf.matmul(a, b)
# Creates a session with log_device_placement set to True.
sess = tf.Session(config=tf.ConfigProto(log_device_placement=True))
# Runs the op.
print (sess.run(c))
end = timeit.timeit()
print ("elapsed", end - start)

starting
[[ 22.  28.]
 [ 49.  64.]]
elapsed -0.0033593010011827573