$ sudo pip install https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-0.5.0-cp27-none-linux_x86_64.whl

$ cd /usr/lib/python2.7/site-packages/tensorflow/models/image/mnist
$ python convolutional.py
...

$ python -m tensorflow.models.image.mnist.convolutional
...

修改前

  with tf.Session(config=config) as s:

修改后

  cpu_num = int(os.environ.get('CPU_NUM', 1))
  config = tf.ConfigProto(device_count={"CPU": cpu_num},
        inter_op_parallelism_threads = cpu_num,
        intra_op_parallelism_threads = cpu_num,
        log_device_placement=True)

  with tf.Session(config=config) as s:

$ export CPU_NUM=2
$ python -m tensorflow.models.image.mnist.convolutional