title: Keras can't use all cores (CPU)
body: <p>I have quite strange case. On new Mac (mid 2017 2,3 GHz Intel Core i5) Keras don't use all 4 cores. I run the same code on my old machine and everything is fine - CPU usage shows 300-400%.</p>
  <p>I've read this <a href="https://stackoverflow.com/questions/46421258/limit-number-of-cores-used-in-keras#46422627">thread</a> but nothing helps:</p>
  <blockquote>
  <p>K.set_session(K.tf.Session(config=K.tf.ConfigProto(intra_op_parallelism_threads=128,
  inter_op_parallelism_threads=128)))</p>
  <p><strong>or</strong>
  config = tf.ConfigProto(device_count={&quot;CPU&quot;: 4})</p>
  </blockquote>
  <p>for example i use scikit-learn on new Mac and CPu usage is more than 200-300%</p>
  <p>my guess is that problem has connection with python version i've used 3.5 and now use 3.6, but can't understand how to solve it</p>
  <p><strong>UPDATE</strong></p>
  <p>i re-install Keras and everything works fine</p>