title: keras version to use with tensorflow-gpu 1.4
body: <p>I am using ubuntu 16, with python 3, tf-GPU with keras.</p>
  
  <p>I downgraded to tf 1.4 due to cuda errors as explained <a href="https://github.com/tensorflow/tensorflow/issues/15604" rel="noreferrer">here</a> </p>
  
  <p>But now I am getting this error </p>
  
  <blockquote>
    <p>TypeError: softmax() got an unexpected keyword argument 'axis'</p>
  </blockquote>
  
  <p>Seems that this is an <a href="https://github.com/keras-team/keras/issues/9900" rel="noreferrer">API change</a> in tensorflow and new keras is not suitable for the old tf. </p>
  
  <p>I can't find what is the correct keras version to use with tf 1.4 gpu. What is the correct one? </p>